Attribute.GetCustomAttributes Metodo
Definizione
Importante
Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.
Recupera una matrice degli attributi personalizzati applicati a un assembly, un modulo, un membro di tipo o un parametro del metodo.
Overload
| GetCustomAttributes(ParameterInfo, Boolean) |
Recupera una matrice degli attributi personalizzati applicati a un parametro del metodo. I parametri specificano il parametro del metodo e se cercare i predecessori del parametro del metodo. |
| GetCustomAttributes(MemberInfo, Type, Boolean) |
Recupera una matrice degli attributi personalizzati applicati a un membro di un tipo. I parametri specificano il membro, il tipo dell'attributo personalizzato da cercare e se cercare i predecessori del membro. |
| GetCustomAttributes(ParameterInfo, Type, Boolean) |
Recupera una matrice degli attributi personalizzati applicati a un parametro del metodo. I parametri specificano il parametro del metodo, il tipo dell'attributo personalizzato da cercare e se cercare i predecessori del parametro del metodo. |
| GetCustomAttributes(Module, Type, Boolean) |
Recupera una matrice degli attributi personalizzati applicati a un modulo. I parametri specificano il modulo, il tipo dell'attributo personalizzato da cercare e un'opzione di ricerca ignorata. |
| GetCustomAttributes(MemberInfo, Type) |
Recupera una matrice degli attributi personalizzati applicati a un membro di un tipo. I parametri specificano il membro e il tipo dell'attributo personalizzato da cercare. |
| GetCustomAttributes(Assembly, Type, Boolean) |
Recupera una matrice degli attributi personalizzati applicati a un assembly. I parametri specificano l'assembly, il tipo dell'attributo personalizzato da cercare e un'opzione di ricerca ignorata. |
| GetCustomAttributes(Module, Type) |
Recupera una matrice degli attributi personalizzati applicati a un modulo. I parametri specificano il modulo e il tipo dell'attributo personalizzato da cercare. |
| GetCustomAttributes(ParameterInfo, Type) |
Recupera una matrice degli attributi personalizzati applicati a un parametro del metodo. I parametri specificano il parametro del metodo e il tipo dell'attributo personalizzato da cercare. |
| GetCustomAttributes(MemberInfo, Boolean) |
Recupera una matrice degli attributi personalizzati applicati a un membro di un tipo. I parametri specificano il membro, il tipo dell'attributo personalizzato da cercare e se cercare i predecessori del membro. |
| GetCustomAttributes(Assembly, Type) |
Recupera una matrice degli attributi personalizzati applicati a un assembly. I parametri specificano l'assembly e il tipo dell'attributo personalizzato da cercare. |
| GetCustomAttributes(Assembly, Boolean) |
Recupera una matrice degli attributi personalizzati applicati a un assembly. I parametri specificano l'assembly e un'opzione di ricerca ignorata. |
| GetCustomAttributes(ParameterInfo) |
Recupera una matrice degli attributi personalizzati applicati a un parametro del metodo. Un parametro specifica il parametro del metodo. |
| GetCustomAttributes(Module) |
Recupera una matrice degli attributi personalizzati applicati a un modulo. Un parametro specifica il modulo. |
| GetCustomAttributes(MemberInfo) |
Recupera una matrice degli attributi personalizzati applicati a un membro di un tipo. Un parametro specifica il membro. |
| GetCustomAttributes(Assembly) |
Recupera una matrice degli attributi personalizzati applicati a un assembly. Un parametro specifica l'assembly. |
| GetCustomAttributes(Module, Boolean) |
Recupera una matrice degli attributi personalizzati applicati a un modulo. I parametri specificano il modulo e un'opzione di ricerca ignorata. |
GetCustomAttributes(ParameterInfo, Boolean)
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
Recupera una matrice degli attributi personalizzati applicati a un parametro del metodo. I parametri specificano il parametro del metodo e se cercare i predecessori del parametro del metodo.
public:
static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::ParameterInfo ^ element, bool inherit);public static Attribute[] GetCustomAttributes (System.Reflection.ParameterInfo element, bool inherit);static member GetCustomAttributes : System.Reflection.ParameterInfo * bool -> Attribute[]Public Shared Function GetCustomAttributes (element As ParameterInfo, inherit As Boolean) As Attribute()Parametri
- element
- ParameterInfo
Oggetto derivato dalla classe ParameterInfo che descrive un parametro di un membro di una classe.
- inherit
- Boolean
Se true, specifica anche di cercare gli attributi personalizzati nei predecessori di element.
Restituisce
Matrice Attribute che contiene gli attributi personalizzati applicati a elemento una matrice vuota se tali attributi personalizzati non esistono.
Eccezioni
La proprietà Member di element è null.
element è null.
Non è possibile caricare un tipo di attributo personalizzato.
Esempio
Nell'esempio di codice seguente viene illustrato l'uso di GetCustomAttributes, accettando un ParameterInfo come parametro.
using namespace System;
using namespace System::Reflection;
using namespace System::ComponentModel;
namespace CustAttrs5CS
{
public ref class AClass
{
public:
void ParamArrayAndDesc(
// Add ParamArray and Description attributes.
[Description("This argument is a ParamArray")]
array<Int32>^args )
{}
};
ref class DemoClass
{
public:
static void Main()
{
// Get the Class type to access its metadata.
Type^ clsType = AClass::typeid;
// Get the type information for the method.
MethodInfo^ mInfo = clsType->GetMethod( "ParamArrayAndDesc" );
if ( mInfo != nullptr )
{
// Get the parameter information.
array<ParameterInfo^>^pInfo = mInfo->GetParameters();
if ( pInfo != nullptr )
{
// Iterate through all the attributes for the parameter.
System::Collections::IEnumerator^ myEnum4 = Attribute::GetCustomAttributes( pInfo[ 0 ] )->GetEnumerator();
while ( myEnum4->MoveNext() )
{
Attribute^ attr = safe_cast<Attribute^>(myEnum4->Current);
// Check for the ParamArray attribute.
if ( attr->GetType() == ParamArrayAttribute::typeid )
Console::WriteLine( "Parameter {0} for method {1} "
"has the ParamArray attribute.", pInfo[ 0 ]->Name, mInfo->Name );
// Check for the Description attribute.
else
// Check for the Description attribute.
if ( attr->GetType() == DescriptionAttribute::typeid )
{
Console::WriteLine( "Parameter {0} for method {1} "
"has a description attribute.", pInfo[ 0 ]->Name, mInfo->Name );
Console::WriteLine( "The description is: \"{0}\"", (dynamic_cast<DescriptionAttribute^>(attr))->Description );
}
}
}
}
}
};
}
/*
* Output:
* Parameter args for method ParamArrayAndDesc has the ParamArray attribute.
* Parameter args for method ParamArrayAndDesc has a description attribute.
* The description is: "This argument is a ParamArray"
*/
using System;
using System.Reflection;
using System.ComponentModel;
namespace CustAttrs5CS {
public class AClass {
public void ParamArrayAndDesc(
// Add ParamArray (with the keyword) and Description attributes.
[Description("This argument is a ParamArray")]
params int[] args)
{}
}
class DemoClass {
static void Main(string[] args) {
// Get the Class type to access its metadata.
Type clsType = typeof(AClass);
// Get the type information for the method.
MethodInfo mInfo = clsType.GetMethod("ParamArrayAndDesc");
if (mInfo != null) {
// Get the parameter information.
ParameterInfo[] pInfo = mInfo.GetParameters();
if (pInfo != null) {
// Iterate through all the attributes for the parameter.
foreach(Attribute attr in
Attribute.GetCustomAttributes(pInfo[0])) {
// Check for the ParamArray attribute.
if (attr.GetType() == typeof(ParamArrayAttribute))
Console.WriteLine("Parameter {0} for method {1} " +
"has the ParamArray attribute.",
pInfo[0].Name, mInfo.Name);
// Check for the Description attribute.
else if (attr.GetType() ==
typeof(DescriptionAttribute)) {
Console.WriteLine("Parameter {0} for method {1} " +
"has a description attribute.",
pInfo[0].Name, mInfo.Name);
Console.WriteLine("The description is: \"{0}\"",
((DescriptionAttribute)attr).Description);
}
}
}
}
}
}
}
/*
* Output:
* Parameter args for method ParamArrayAndDesc has the ParamArray attribute.
* Parameter args for method ParamArrayAndDesc has a description attribute.
* The description is: "This argument is a ParamArray"
*/
open System
open System.Reflection
open System.ComponentModel
type AClass() =
member _.ParamArrayAndDesc(
// Add ParamArray and Description attributes.
[<Description "This argument is a ParamArray">]
[<ParamArray>]
args: int[]) = ()
// Get the Class type to access its metadata.
let clsType = typeof<AClass>
// Get the type information for the method.
let mInfo = clsType.GetMethod "ParamArrayAndDesc"
if mInfo <> null then
// Get the parameter information.
let pInfo = mInfo.GetParameters()
if pInfo <> null then
// Iterate through all the attributes for the parameter.
for attr in Attribute.GetCustomAttributes pInfo[0] do
match attr with
// Check for the ParamArray attribute.
| :? ParamArrayAttribute ->
printfn $"Parameter {pInfo[0].Name} for method {mInfo.Name} has the ParamArray attribute."
// Check for the Description attribute.
| :? DescriptionAttribute as attr ->
printfn $"Parameter {pInfo[0].Name} for method {mInfo.Name} has a description attribute."
printfn $"The description is: \"{attr.Description}\""
| _ -> ()
// Output:
// Parameter args for method ParamArrayAndDesc has a description attribute.
// The description is: "This argument is a ParamArray"
// Parameter args for method ParamArrayAndDesc has the ParamArray attribute.
Imports System.Reflection
Imports System.ComponentModel
Module DemoModule
Public Class AClass
' Add Description and ParamArray (with the keyword) attributes.
Public Sub ParamArrayAndDesc( _
<Description("This argument is a ParamArray")> _
ByVal ParamArray args() As Integer)
End Sub
End Class
Sub Main()
' Get the Class type to access its metadata.
Dim clsType As Type = GetType(AClass)
' Get the type information for the method.
Dim mInfo As MethodInfo = clsType.GetMethod("ParamArrayAndDesc")
' Get the Parameter information for the method.
Dim pInfo() As ParameterInfo = mInfo.GetParameters()
Dim attr As Attribute
' Iterate through each attribute of the parameter.
For Each attr In Attribute.GetCustomAttributes(pInfo(0))
' Check for the ParamArray attribute.
If TypeOf attr Is ParamArrayAttribute Then
' Convert the attribute to access its data.
Dim paAttr As ParamArrayAttribute = _
CType(attr, ParamArrayAttribute)
Console.WriteLine("Parameter {0} for method {1} has the " + _
"ParamArray attribute.", pInfo(0).Name, mInfo.Name)
' Check for the Description attribute.
ElseIf TypeOf attr Is DescriptionAttribute Then
' Convert the attribute to access its data.
Dim descAttr As DescriptionAttribute = _
CType(attr, DescriptionAttribute)
Console.WriteLine("Parameter {0} for method {1} has a description " + _
"attribute. The description is:", pInfo(0).Name, mInfo.Name)
Console.WriteLine(descAttr.Description)
End If
Next
End Sub
End Module
' Output:
' Parameter args for method ParamArrayAndDesc has the ParamArray attribute.
' Parameter args for method ParamArrayAndDesc has a description attribute. The description is:
' This argument is a ParamArray
Commenti
Se element rappresenta un parametro in un metodo di un tipo derivato, il valore restituito include gli attributi personalizzati ereditabili applicati allo stesso parametro nei metodi di base sottoposti a override.
Si applica a
GetCustomAttributes(MemberInfo, Type, Boolean)
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
Recupera una matrice degli attributi personalizzati applicati a un membro di un tipo. I parametri specificano il membro, il tipo dell'attributo personalizzato da cercare e se cercare i predecessori del membro.
public:
static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::MemberInfo ^ element, Type ^ type, bool inherit);public:
static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::MemberInfo ^ element, Type ^ attributeType, bool inherit);public static Attribute[] GetCustomAttributes (System.Reflection.MemberInfo element, Type type, bool inherit);public static Attribute[] GetCustomAttributes (System.Reflection.MemberInfo element, Type attributeType, bool inherit);static member GetCustomAttributes : System.Reflection.MemberInfo * Type * bool -> Attribute[]static member GetCustomAttributes : System.Reflection.MemberInfo * Type * bool -> Attribute[]Public Shared Function GetCustomAttributes (element As MemberInfo, type As Type, inherit As Boolean) As Attribute()Public Shared Function GetCustomAttributes (element As MemberInfo, attributeType As Type, inherit As Boolean) As Attribute()Parametri
- element
- MemberInfo
Oggetto derivato dalla classe MemberInfo che descrive un costruttore, un evento, un campo, un metodo o un membro della proprietà di una classe.
- typeattributeType
- Type
Tipo, o tipo di base, dell'attributo personalizzato da cercare.
- inherit
- Boolean
Se true, specifica anche di cercare gli attributi personalizzati nei predecessori di element.
Restituisce
Matrice Attribute che contiene gli attributi personalizzati di tipo type applicati a elemento una matrice vuota se non esistono attributi personalizzati di questo tipo.
Eccezioni
element o type è null.
type non deriva da Attribute.
element non è un costruttore, un metodo, una proprietà, un evento, un tipo o un campo.
Non è possibile caricare un tipo di attributo personalizzato.
Esempio
Nell'esempio di codice seguente viene illustrato l'uso di GetCustomAttributes, accettando un MemberInfo come parametro.
using namespace System;
using namespace System::Reflection;
using namespace System::Security;
using namespace System::Runtime::InteropServices;
namespace CustAttrs4CS
{
// Create a class for Win32 imported unmanaged functions.
public ref class Win32
{
public:
[DllImport("user32.dll", CharSet = CharSet::Unicode)]
static int MessageBox( int hWnd, String^ text, String^ caption, UInt32 type );
};
public ref class AClass
{
public:
// Add some attributes to the Win32CallMethod.
[Obsolete("This method is obsolete. Use managed MsgBox instead.")]
void Win32CallMethod()
{
Win32::MessageBox( 0, "This is an unmanaged call.", "Be Careful!", 0 );
}
};
ref class DemoClass
{
public:
static void Main()
{
// Get the Class type to access its metadata.
Type^ clsType = AClass::typeid;
// Get the type information for the Win32CallMethod.
MethodInfo^ mInfo = clsType->GetMethod( "Win32CallMethod" );
if ( mInfo != nullptr )
{
// Iterate through all the attributes for the method.
System::Collections::IEnumerator^ myEnum3 = Attribute::GetCustomAttributes( mInfo )->GetEnumerator();
while ( myEnum3->MoveNext() )
{
Attribute^ attr = safe_cast<Attribute^>(myEnum3->Current);
// Check for the Obsolete attribute.
if ( attr->GetType() == ObsoleteAttribute::typeid )
{
Console::WriteLine( "Method {0} is obsolete. "
"The message is:", mInfo->Name );
Console::WriteLine( (dynamic_cast<ObsoleteAttribute^>(attr))->Message );
}
// Check for the SuppressUnmanagedCodeSecurity attribute.
else
// Check for the SuppressUnmanagedCodeSecurity attribute.
if ( attr->GetType() == SuppressUnmanagedCodeSecurityAttribute::typeid )
{
Console::WriteLine( "This method calls unmanaged code "
"with no security check." );
Console::WriteLine( "Please do not use unless absolutely necessary." );
AClass^ myCls = gcnew AClass;
myCls->Win32CallMethod();
}
}
}
}
};
}
/*
* Output:
* Method Win32CallMethod is obsolete. The message is:
* This method is obsolete. Use managed MsgBox instead.
* This method calls unmanaged code with no security check.
* Please do not use unless absolutely necessary.
*/
using System;
using System.Reflection;
using System.Security;
using System.Runtime.InteropServices;
namespace CustAttrs4CS
{
// Define an enumeration of Win32 unmanaged types
public enum UnmanagedType
{
User,
GDI,
Kernel,
Shell,
Networking,
Multimedia
}
// Define the Unmanaged attribute.
public class UnmanagedAttribute : Attribute
{
// Storage for the UnmanagedType value.
protected UnmanagedType thisType;
// Set the unmanaged type in the constructor.
public UnmanagedAttribute(UnmanagedType type)
{
thisType = type;
}
// Define a property to get and set the UnmanagedType value.
public UnmanagedType Win32Type
{
get { return thisType; }
set { thisType = Win32Type; }
}
}
// Create a class for an imported Win32 unmanaged function.
public class Win32 {
[DllImport("user32.dll", CharSet = CharSet.Unicode)]
public static extern int MessageBox(int hWnd, String text,
String caption, uint type);
}
public class AClass {
// Add some attributes to Win32CallMethod.
[Obsolete("This method is obsolete. Use managed MsgBox instead.")]
[Unmanaged(UnmanagedType.User)]
public void Win32CallMethod()
{
Win32.MessageBox(0, "This is an unmanaged call.", "Caution!", 0);
}
}
class DemoClass {
static void Main(string[] args)
{
// Get the AClass type to access its metadata.
Type clsType = typeof(AClass);
// Get the type information for Win32CallMethod.
MethodInfo mInfo = clsType.GetMethod("Win32CallMethod");
if (mInfo != null)
{
// Iterate through all the attributes of the method.
foreach(Attribute attr in
Attribute.GetCustomAttributes(mInfo)) {
// Check for the Obsolete attribute.
if (attr.GetType() == typeof(ObsoleteAttribute))
{
Console.WriteLine("Method {0} is obsolete. " +
"The message is:",
mInfo.Name);
Console.WriteLine(" \"{0}\"",
((ObsoleteAttribute)attr).Message);
}
// Check for the Unmanaged attribute.
else if (attr.GetType() == typeof(UnmanagedAttribute))
{
Console.WriteLine(
"This method calls unmanaged code.");
Console.WriteLine(
String.Format("The Unmanaged attribute type is {0}.",
((UnmanagedAttribute)attr).Win32Type));
AClass myCls = new AClass();
myCls.Win32CallMethod();
}
}
}
}
}
}
/*
This code example produces the following results.
First, the compilation yields the warning, "... This method is
obsolete. Use managed MsgBox instead."
Second, execution yields a message box with a title of "Caution!"
and message text of "This is an unmanaged call."
Third, the following text is displayed in the console window:
Method Win32CallMethod is obsolete. The message is:
"This method is obsolete. Use managed MsgBox instead."
This method calls unmanaged code.
The Unmanaged attribute type is User.
*/
open System
open System.Runtime.InteropServices
// Define an enumeration of Win32 unmanaged types
type UnmanagedType =
| User = 0
| GDI = 1
| Kernel = 2
| Shell = 3
| Networking = 4
| Multimedia = 5
// Define the Unmanaged attribute.
type UnmanagedAttribute(unmanagedType) =
inherit Attribute()
// Define a property to get and set the UnmanagedType value.
member val Win32Type = unmanagedType with get, set
// Create a module for an imported Win32 unmanaged function.
module Win32 =
[<DllImport("user32.dll", CharSet = CharSet.Unicode)>]
extern int MessageBox(IntPtr hWnd, String text, String caption, uint ``type``)
type AClass() =
// Add some attributes to Win32CallMethod.
[<Obsolete "This method is obsolete. Use managed MsgBox instead.">]
[<Unmanaged(UnmanagedType.User)>]
member _.Win32CallMethod () =
Win32.MessageBox(0, "This is an unmanaged call.", "Caution!", 0u)
// Get the AClass type to access its metadata.
let clsType = typeof<AClass>
// Get the type information for Win32CallMethod.
let mInfo = clsType.GetMethod "Win32CallMethod"
if mInfo <> null then
// Iterate through all the attributes of the method.
for attr in Attribute.GetCustomAttributes mInfo do
match attr with
// Check for the Obsolete attribute.
| :? ObsoleteAttribute as attr ->
printfn $"Method {mInfo.Name} is obsolete. The message is:"
printfn $" \"{attr.Message}\""
// Check for the Unmanaged attribute.
| :? UnmanagedAttribute as attr ->
printfn "This method calls unmanaged code."
printfn $"The Unmanaged attribute type is {attr.Win32Type}."
let myCls = AClass()
myCls.Win32CallMethod() |> ignore
| _ -> ()
// This code example produces the following results.
//
// First, the compilation yields the warning, "... This method is
// obsolete. Use managed MsgBox instead."
// Second, execution yields a message box with a title of "Caution!"
// and message text of "This is an unmanaged call."
// Third, the following text is displayed in the console window:
// Method Win32CallMethod is obsolete. The message is:
// "This method is obsolete. Use managed MsgBox instead."
// This method calls unmanaged code.
// The Unmanaged attribute type is User.
Imports System.Reflection
Imports System.Security
Imports System.Runtime.InteropServices
' Define an enumeration of Win32 unmanaged types
Public Enum UnmanagedType
User
GDI
Kernel
Shell
Networking
Multimedia
End Enum 'UnmanagedType
' Define the Unmanaged attribute.
Public Class UnmanagedAttribute
Inherits Attribute
' Storage for the UnmanagedType value.
Protected thisType As UnmanagedType
' Set the unmanaged type in the constructor.
Public Sub New(ByVal type As UnmanagedType)
thisType = type
End Sub
' Define a property to get and set the UnmanagedType value.
Public Property Win32Type() As UnmanagedType
Get
Return thisType
End Get
Set
thisType = Win32Type
End Set
End Property
End Class
' Create a class for an imported Win32 unmanaged function.
Public Class Win32
<DllImport("user32.dll", CharSet:=CharSet.Unicode)> _
Public Shared Function MessageBox(ByVal hWnd As Integer, _
ByVal Text As String, _
ByVal caption As String, _
ByVal type As Integer) As Integer
End Function 'MessageBox
End Class
Public Class AClass
' Add some attributes to Win32CallMethod.
<Obsolete("This method is obsolete. Use managed MsgBox instead."), _
Unmanaged(UnmanagedType.User)> _
Public Sub Win32CallMethod()
Win32.MessageBox(0, "This is an unmanaged call.", "Caution!", 0)
End Sub
End Class
Class DemoClass
Shared Sub Main(ByVal args() As String)
' Get the AClass type to access its metadata.
Dim clsType As Type = GetType(AClass)
' Get the type information for Win32CallMethod.
Dim mInfo As MethodInfo = clsType.GetMethod("Win32CallMethod")
If Not (mInfo Is Nothing) Then
' Iterate through all the attributes of the method.
Dim attr As Attribute
For Each attr In Attribute.GetCustomAttributes(mInfo)
' Check for the Obsolete attribute.
If attr.GetType().Equals(GetType(ObsoleteAttribute)) Then
Console.WriteLine("Method {0} is obsolete. The message is:", mInfo.Name)
Console.WriteLine(" ""{0}""", CType(attr, ObsoleteAttribute).Message)
' Check for the Unmanaged attribute.
ElseIf attr.GetType().Equals(GetType(UnmanagedAttribute)) Then
Console.WriteLine("This method calls unmanaged code.")
Console.WriteLine( _
String.Format("The Unmanaged attribute type is {0}.", _
CType(attr, UnmanagedAttribute).Win32Type))
Dim myCls As New AClass()
myCls.Win32CallMethod()
End If
Next attr
End If
End Sub
End Class
'
'This code example produces the following results.
'
'First, the compilation yields the warning, "... This method is
'obsolete. Use managed MsgBox instead."
'Second, execution yields a message box with a title of "Caution!"
'and message text of "This is an unmanaged call."
'Third, the following text is displayed in the console window:
'
'Method Win32CallMethod is obsolete. The message is:
' "This method is obsolete. Use managed MsgBox instead."
'This method calls unmanaged code.
'The Unmanaged attribute type is User.
'
Commenti
Il valore restituito contiene gli attributi personalizzati per i predecessori di element se inherit è true.
Nota
A partire da .NET Framework versione 2.0, questo metodo restituisce attributi di sicurezza per metodi, costruttori e tipi se gli attributi vengono archiviati nel nuovo formato di metadati. Gli assembly compilati con la versione 2.0 o successiva usano il nuovo formato. Gli assembly dinamici e gli assembly compilati con le versioni precedenti di .NET Framework usano il formato XML precedente. Vedere creazione di attributi di sicurezza dichiarativi.
Si applica a
GetCustomAttributes(ParameterInfo, Type, Boolean)
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
Recupera una matrice degli attributi personalizzati applicati a un parametro del metodo. I parametri specificano il parametro del metodo, il tipo dell'attributo personalizzato da cercare e se cercare i predecessori del parametro del metodo.
public:
static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::ParameterInfo ^ element, Type ^ attributeType, bool inherit);public static Attribute[] GetCustomAttributes (System.Reflection.ParameterInfo element, Type attributeType, bool inherit);static member GetCustomAttributes : System.Reflection.ParameterInfo * Type * bool -> Attribute[]Public Shared Function GetCustomAttributes (element As ParameterInfo, attributeType As Type, inherit As Boolean) As Attribute()Parametri
- element
- ParameterInfo
Oggetto derivato dalla classe ParameterInfo che descrive un parametro di un membro di una classe.
- attributeType
- Type
Tipo, o tipo di base, dell'attributo personalizzato da cercare.
- inherit
- Boolean
Se true, specifica anche di cercare gli attributi personalizzati nei predecessori di element.
Restituisce
Matrice Attribute che contiene gli attributi personalizzati di tipo attributeType applicati a elemento una matrice vuota se non esistono attributi personalizzati di questo tipo.
Eccezioni
element o attributeType è null.
attributeType non deriva da Attribute.
Non è possibile caricare un tipo di attributo personalizzato.
Esempio
Nell'esempio di codice seguente viene illustrato l'uso di GetCustomAttributes, accettando un ParameterInfo come parametro.
using namespace System;
using namespace System::Reflection;
using namespace System::ComponentModel;
namespace CustAttrs5CS
{
public ref class AClass
{
public:
void ParamArrayAndDesc(
// Add ParamArray and Description attributes.
[Description("This argument is a ParamArray")]
array<Int32>^args )
{}
};
ref class DemoClass
{
public:
static void Main()
{
// Get the Class type to access its metadata.
Type^ clsType = AClass::typeid;
// Get the type information for the method.
MethodInfo^ mInfo = clsType->GetMethod( "ParamArrayAndDesc" );
if ( mInfo != nullptr )
{
// Get the parameter information.
array<ParameterInfo^>^pInfo = mInfo->GetParameters();
if ( pInfo != nullptr )
{
// Iterate through all the attributes for the parameter.
System::Collections::IEnumerator^ myEnum4 = Attribute::GetCustomAttributes( pInfo[ 0 ] )->GetEnumerator();
while ( myEnum4->MoveNext() )
{
Attribute^ attr = safe_cast<Attribute^>(myEnum4->Current);
// Check for the ParamArray attribute.
if ( attr->GetType() == ParamArrayAttribute::typeid )
Console::WriteLine( "Parameter {0} for method {1} "
"has the ParamArray attribute.", pInfo[ 0 ]->Name, mInfo->Name );
// Check for the Description attribute.
else
// Check for the Description attribute.
if ( attr->GetType() == DescriptionAttribute::typeid )
{
Console::WriteLine( "Parameter {0} for method {1} "
"has a description attribute.", pInfo[ 0 ]->Name, mInfo->Name );
Console::WriteLine( "The description is: \"{0}\"", (dynamic_cast<DescriptionAttribute^>(attr))->Description );
}
}
}
}
}
};
}
/*
* Output:
* Parameter args for method ParamArrayAndDesc has the ParamArray attribute.
* Parameter args for method ParamArrayAndDesc has a description attribute.
* The description is: "This argument is a ParamArray"
*/
using System;
using System.Reflection;
using System.ComponentModel;
namespace CustAttrs5CS {
public class AClass {
public void ParamArrayAndDesc(
// Add ParamArray (with the keyword) and Description attributes.
[Description("This argument is a ParamArray")]
params int[] args)
{}
}
class DemoClass {
static void Main(string[] args) {
// Get the Class type to access its metadata.
Type clsType = typeof(AClass);
// Get the type information for the method.
MethodInfo mInfo = clsType.GetMethod("ParamArrayAndDesc");
if (mInfo != null) {
// Get the parameter information.
ParameterInfo[] pInfo = mInfo.GetParameters();
if (pInfo != null) {
// Iterate through all the attributes for the parameter.
foreach(Attribute attr in
Attribute.GetCustomAttributes(pInfo[0])) {
// Check for the ParamArray attribute.
if (attr.GetType() == typeof(ParamArrayAttribute))
Console.WriteLine("Parameter {0} for method {1} " +
"has the ParamArray attribute.",
pInfo[0].Name, mInfo.Name);
// Check for the Description attribute.
else if (attr.GetType() ==
typeof(DescriptionAttribute)) {
Console.WriteLine("Parameter {0} for method {1} " +
"has a description attribute.",
pInfo[0].Name, mInfo.Name);
Console.WriteLine("The description is: \"{0}\"",
((DescriptionAttribute)attr).Description);
}
}
}
}
}
}
}
/*
* Output:
* Parameter args for method ParamArrayAndDesc has the ParamArray attribute.
* Parameter args for method ParamArrayAndDesc has a description attribute.
* The description is: "This argument is a ParamArray"
*/
open System
open System.Reflection
open System.ComponentModel
type AClass() =
member _.ParamArrayAndDesc(
// Add ParamArray and Description attributes.
[<Description "This argument is a ParamArray">]
[<ParamArray>]
args: int[]) = ()
// Get the Class type to access its metadata.
let clsType = typeof<AClass>
// Get the type information for the method.
let mInfo = clsType.GetMethod "ParamArrayAndDesc"
if mInfo <> null then
// Get the parameter information.
let pInfo = mInfo.GetParameters()
if pInfo <> null then
// Iterate through all the attributes for the parameter.
for attr in Attribute.GetCustomAttributes pInfo[0] do
match attr with
// Check for the ParamArray attribute.
| :? ParamArrayAttribute ->
printfn $"Parameter {pInfo[0].Name} for method {mInfo.Name} has the ParamArray attribute."
// Check for the Description attribute.
| :? DescriptionAttribute as attr ->
printfn $"Parameter {pInfo[0].Name} for method {mInfo.Name} has a description attribute."
printfn $"The description is: \"{attr.Description}\""
| _ -> ()
// Output:
// Parameter args for method ParamArrayAndDesc has a description attribute.
// The description is: "This argument is a ParamArray"
// Parameter args for method ParamArrayAndDesc has the ParamArray attribute.
Imports System.Reflection
Imports System.ComponentModel
Module DemoModule
Public Class AClass
' Add Description and ParamArray (with the keyword) attributes.
Public Sub ParamArrayAndDesc( _
<Description("This argument is a ParamArray")> _
ByVal ParamArray args() As Integer)
End Sub
End Class
Sub Main()
' Get the Class type to access its metadata.
Dim clsType As Type = GetType(AClass)
' Get the type information for the method.
Dim mInfo As MethodInfo = clsType.GetMethod("ParamArrayAndDesc")
' Get the Parameter information for the method.
Dim pInfo() As ParameterInfo = mInfo.GetParameters()
Dim attr As Attribute
' Iterate through each attribute of the parameter.
For Each attr In Attribute.GetCustomAttributes(pInfo(0))
' Check for the ParamArray attribute.
If TypeOf attr Is ParamArrayAttribute Then
' Convert the attribute to access its data.
Dim paAttr As ParamArrayAttribute = _
CType(attr, ParamArrayAttribute)
Console.WriteLine("Parameter {0} for method {1} has the " + _
"ParamArray attribute.", pInfo(0).Name, mInfo.Name)
' Check for the Description attribute.
ElseIf TypeOf attr Is DescriptionAttribute Then
' Convert the attribute to access its data.
Dim descAttr As DescriptionAttribute = _
CType(attr, DescriptionAttribute)
Console.WriteLine("Parameter {0} for method {1} has a description " + _
"attribute. The description is:", pInfo(0).Name, mInfo.Name)
Console.WriteLine(descAttr.Description)
End If
Next
End Sub
End Module
' Output:
' Parameter args for method ParamArrayAndDesc has the ParamArray attribute.
' Parameter args for method ParamArrayAndDesc has a description attribute. The description is:
' This argument is a ParamArray
Commenti
Se element rappresenta un parametro in un metodo di un tipo derivato, il valore restituito include gli attributi personalizzati ereditabili applicati allo stesso parametro nei metodi di base sottoposti a override.
Si applica a
GetCustomAttributes(Module, Type, Boolean)
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
Recupera una matrice degli attributi personalizzati applicati a un modulo. I parametri specificano il modulo, il tipo dell'attributo personalizzato da cercare e un'opzione di ricerca ignorata.
public:
static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::Module ^ element, Type ^ attributeType, bool inherit);public static Attribute[] GetCustomAttributes (System.Reflection.Module element, Type attributeType, bool inherit);static member GetCustomAttributes : System.Reflection.Module * Type * bool -> Attribute[]Public Shared Function GetCustomAttributes (element As Module, attributeType As Type, inherit As Boolean) As Attribute()Parametri
- attributeType
- Type
Tipo, o tipo di base, dell'attributo personalizzato da cercare.
- inherit
- Boolean
Questo parametro viene ignorato e non influisce sull'operazione di questo metodo.
Restituisce
Matrice Attribute che contiene gli attributi personalizzati di tipo attributeType applicati a elemento una matrice vuota se non esistono attributi personalizzati di questo tipo.
Eccezioni
element o attributeType è null.
attributeType non deriva da Attribute.
Esempio
Nell'esempio di codice seguente viene illustrato l'uso di GetCustomAttributes, accettando un Module come parametro.
using namespace System;
using namespace System::Reflection;
using namespace System::ComponentModel;
// Assign some attributes to the module.
// Set the module's CLSCompliant attribute to false
// The CLSCompliant attribute is applicable for /target:module.
[module:Description("A sample description")];
[module:CLSCompliant(false)];
namespace CustAttrs2CS
{
ref class DemoClass
{
public:
static void Main()
{
Type^ clsType = DemoClass::typeid;
// Get the Module type to access its metadata.
Module^ module = clsType->Module;
// Iterate through all the attributes for the module.
System::Collections::IEnumerator^ myEnum1 = Attribute::GetCustomAttributes( module )->GetEnumerator();
while ( myEnum1->MoveNext() )
{
Attribute^ attr = safe_cast<Attribute^>(myEnum1->Current);
// Check for the Description attribute.
if ( attr->GetType() == DescriptionAttribute::typeid )
Console::WriteLine( "Module {0} has the description \"{1}\".", module->Name, (dynamic_cast<DescriptionAttribute^>(attr))->Description );
// Check for the CLSCompliant attribute.
else
// Check for the CLSCompliant attribute.
if ( attr->GetType() == CLSCompliantAttribute::typeid )
Console::WriteLine( "Module {0} {1} CLSCompliant.", module->Name, (dynamic_cast<CLSCompliantAttribute^>(attr))->IsCompliant ? (String^)"is" : "is not" );
}
}
};
}
/*
* Output:
* Module CustAttrs2CS.exe is not CLSCompliant.
* Module CustAttrs2CS.exe has the description "A sample description".
*/
using System;
using System.Reflection;
using System.ComponentModel;
// Assign some attributes to the module.
[module:Description("A sample description")]
// Set the module's CLSCompliant attribute to false
// The CLSCompliant attribute is applicable for /target:module.
[module:CLSCompliant(false)]
namespace CustAttrs2CS {
class DemoClass {
static void Main(string[] args) {
Type clsType = typeof(DemoClass);
// Get the Module type to access its metadata.
Module module = clsType.Module;
// Iterate through all the attributes for the module.
foreach(Attribute attr in Attribute.GetCustomAttributes(module)) {
// Check for the Description attribute.
if (attr.GetType() == typeof(DescriptionAttribute))
Console.WriteLine("Module {0} has the description " +
"\"{1}\".", module.Name,
((DescriptionAttribute)attr).Description);
// Check for the CLSCompliant attribute.
else if (attr.GetType() == typeof(CLSCompliantAttribute))
Console.WriteLine("Module {0} {1} CLSCompliant.",
module.Name,
((CLSCompliantAttribute)attr).IsCompliant ?
"is" : "is not");
}
}
}
}
/*
* Output:
* Module CustAttrs2CS.exe is not CLSCompliant.
* Module CustAttrs2CS.exe has the description "A sample description".
*/
open System
open System.ComponentModel
// Assign some attributes to the module.
[<``module``: Description "A sample description">]
// Set the module's CLSCompliant attribute to false
// The CLSCompliant attribute is applicable for /target:module.
[<``module``: CLSCompliant false>]
do ()
type DemoClass = class end
// Get the Module type to access its metadata.
let ilmodule = typeof<DemoClass>.Module
// Iterate through all the attributes for the module.
for attr in Attribute.GetCustomAttributes ilmodule do
match attr with
// Check for the Description attribute.
| :? DescriptionAttribute as attr ->
printfn $"Module {ilmodule.Name} has the description \"{attr.Description}\"."
// Check for the CLSCompliant attribute.
| :? CLSCompliantAttribute as attr ->
printfn $"""Module {ilmodule.Name} {if attr.IsCompliant then "is" else "is not"} CLSCompliant."""
| _ -> ()
// Output:
// Module CustAttrs2CS.exe is not CLSCompliant.
// Module CustAttrs2CS.exe has the description "A sample description".
Imports System.Reflection
Imports System.ComponentModel
' Give the Module some attributes.
<Module: Description("A sample description")>
' Make the CLSCompliant attribute False.
' The CLSCompliant attribute is applicable for /target:module.
<Module: CLSCompliant(False)>
Module DemoModule
Sub Main()
' Get the Module type to access its metadata.
Dim modType As Reflection.Module = GetType(DemoModule).Module
Dim attr As Attribute
' Iterate through all the attributes for the module.
For Each attr In Attribute.GetCustomAttributes(modType)
' Check for the Description attribute.
If TypeOf attr Is DescriptionAttribute Then
' Convert the attribute to access its data.
Dim descAttr As DescriptionAttribute = _
CType(attr, DescriptionAttribute)
Console.WriteLine("Module {0} has the description ""{1}"".", _
modType.Name, descAttr.Description)
' Check for the CLSCompliant attribute.
ElseIf TypeOf attr Is CLSCompliantAttribute Then
' Convert the attribute to access its data.
Dim CLSCompAttr As CLSCompliantAttribute = _
CType(attr, CLSCompliantAttribute)
Dim strCompliant As String
If CLSCompAttr.IsCompliant Then
strCompliant = "is"
Else
strCompliant = "is not"
End If
Console.WriteLine("Module {0} {1} CLSCompliant.", _
modType.Name, strCompliant)
End If
Next
End Sub
End Module
' Output:
' Module CustAttrs2VB.exe has the description "A sample description".
' Module CustAttrs2VB.exe is not CLSCompliant.
Commenti
Il valore restituito contiene gli attributi personalizzati per i predecessori di element se inherit è true.
Si applica a
GetCustomAttributes(MemberInfo, Type)
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
Recupera una matrice degli attributi personalizzati applicati a un membro di un tipo. I parametri specificano il membro e il tipo dell'attributo personalizzato da cercare.
public:
static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::MemberInfo ^ element, Type ^ type);public:
static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::MemberInfo ^ element, Type ^ attributeType);public static Attribute[] GetCustomAttributes (System.Reflection.MemberInfo element, Type type);public static Attribute[] GetCustomAttributes (System.Reflection.MemberInfo element, Type attributeType);static member GetCustomAttributes : System.Reflection.MemberInfo * Type -> Attribute[]static member GetCustomAttributes : System.Reflection.MemberInfo * Type -> Attribute[]Public Shared Function GetCustomAttributes (element As MemberInfo, type As Type) As Attribute()Public Shared Function GetCustomAttributes (element As MemberInfo, attributeType As Type) As Attribute()Parametri
- element
- MemberInfo
Oggetto derivato dalla classe MemberInfo che descrive un costruttore, un evento, un campo, un metodo o un membro della proprietà di una classe.
- typeattributeType
- Type
Tipo, o tipo di base, dell'attributo personalizzato da cercare.
Restituisce
Matrice Attribute che contiene gli attributi personalizzati di tipo type applicati a elemento una matrice vuota se non esistono attributi personalizzati di questo tipo.
Eccezioni
element o type è null.
type non deriva da Attribute.
element non è un costruttore, un metodo, una proprietà, un evento, un tipo o un campo.
Non è possibile caricare un tipo di attributo personalizzato.
Esempio
Nell'esempio di codice seguente viene illustrato l'uso di GetCustomAttribute, accettando un MemberInfo come parametro.
using namespace System;
using namespace System::Reflection;
using namespace System::Security;
using namespace System::Runtime::InteropServices;
namespace CustAttrs4CS
{
// Create a class for Win32 imported unmanaged functions.
public ref class Win32
{
public:
[DllImport("user32.dll", CharSet = CharSet::Unicode)]
static int MessageBox( int hWnd, String^ text, String^ caption, UInt32 type );
};
public ref class AClass
{
public:
// Add some attributes to the Win32CallMethod.
[Obsolete("This method is obsolete. Use managed MsgBox instead.")]
void Win32CallMethod()
{
Win32::MessageBox( 0, "This is an unmanaged call.", "Be Careful!", 0 );
}
};
ref class DemoClass
{
public:
static void Main()
{
// Get the Class type to access its metadata.
Type^ clsType = AClass::typeid;
// Get the type information for the Win32CallMethod.
MethodInfo^ mInfo = clsType->GetMethod( "Win32CallMethod" );
if ( mInfo != nullptr )
{
// Iterate through all the attributes for the method.
System::Collections::IEnumerator^ myEnum3 = Attribute::GetCustomAttributes( mInfo )->GetEnumerator();
while ( myEnum3->MoveNext() )
{
Attribute^ attr = safe_cast<Attribute^>(myEnum3->Current);
// Check for the Obsolete attribute.
if ( attr->GetType() == ObsoleteAttribute::typeid )
{
Console::WriteLine( "Method {0} is obsolete. "
"The message is:", mInfo->Name );
Console::WriteLine( (dynamic_cast<ObsoleteAttribute^>(attr))->Message );
}
// Check for the SuppressUnmanagedCodeSecurity attribute.
else
// Check for the SuppressUnmanagedCodeSecurity attribute.
if ( attr->GetType() == SuppressUnmanagedCodeSecurityAttribute::typeid )
{
Console::WriteLine( "This method calls unmanaged code "
"with no security check." );
Console::WriteLine( "Please do not use unless absolutely necessary." );
AClass^ myCls = gcnew AClass;
myCls->Win32CallMethod();
}
}
}
}
};
}
/*
* Output:
* Method Win32CallMethod is obsolete. The message is:
* This method is obsolete. Use managed MsgBox instead.
* This method calls unmanaged code with no security check.
* Please do not use unless absolutely necessary.
*/
using System;
using System.Reflection;
using System.Security;
using System.Runtime.InteropServices;
namespace CustAttrs4CS
{
// Define an enumeration of Win32 unmanaged types
public enum UnmanagedType
{
User,
GDI,
Kernel,
Shell,
Networking,
Multimedia
}
// Define the Unmanaged attribute.
public class UnmanagedAttribute : Attribute
{
// Storage for the UnmanagedType value.
protected UnmanagedType thisType;
// Set the unmanaged type in the constructor.
public UnmanagedAttribute(UnmanagedType type)
{
thisType = type;
}
// Define a property to get and set the UnmanagedType value.
public UnmanagedType Win32Type
{
get { return thisType; }
set { thisType = Win32Type; }
}
}
// Create a class for an imported Win32 unmanaged function.
public class Win32 {
[DllImport("user32.dll", CharSet = CharSet.Unicode)]
public static extern int MessageBox(int hWnd, String text,
String caption, uint type);
}
public class AClass {
// Add some attributes to Win32CallMethod.
[Obsolete("This method is obsolete. Use managed MsgBox instead.")]
[Unmanaged(UnmanagedType.User)]
public void Win32CallMethod()
{
Win32.MessageBox(0, "This is an unmanaged call.", "Caution!", 0);
}
}
class DemoClass {
static void Main(string[] args)
{
// Get the AClass type to access its metadata.
Type clsType = typeof(AClass);
// Get the type information for Win32CallMethod.
MethodInfo mInfo = clsType.GetMethod("Win32CallMethod");
if (mInfo != null)
{
// Iterate through all the attributes of the method.
foreach(Attribute attr in
Attribute.GetCustomAttributes(mInfo)) {
// Check for the Obsolete attribute.
if (attr.GetType() == typeof(ObsoleteAttribute))
{
Console.WriteLine("Method {0} is obsolete. " +
"The message is:",
mInfo.Name);
Console.WriteLine(" \"{0}\"",
((ObsoleteAttribute)attr).Message);
}
// Check for the Unmanaged attribute.
else if (attr.GetType() == typeof(UnmanagedAttribute))
{
Console.WriteLine(
"This method calls unmanaged code.");
Console.WriteLine(
String.Format("The Unmanaged attribute type is {0}.",
((UnmanagedAttribute)attr).Win32Type));
AClass myCls = new AClass();
myCls.Win32CallMethod();
}
}
}
}
}
}
/*
This code example produces the following results.
First, the compilation yields the warning, "... This method is
obsolete. Use managed MsgBox instead."
Second, execution yields a message box with a title of "Caution!"
and message text of "This is an unmanaged call."
Third, the following text is displayed in the console window:
Method Win32CallMethod is obsolete. The message is:
"This method is obsolete. Use managed MsgBox instead."
This method calls unmanaged code.
The Unmanaged attribute type is User.
*/
open System
open System.Runtime.InteropServices
// Define an enumeration of Win32 unmanaged types
type UnmanagedType =
| User = 0
| GDI = 1
| Kernel = 2
| Shell = 3
| Networking = 4
| Multimedia = 5
// Define the Unmanaged attribute.
type UnmanagedAttribute(unmanagedType) =
inherit Attribute()
// Define a property to get and set the UnmanagedType value.
member val Win32Type = unmanagedType with get, set
// Create a module for an imported Win32 unmanaged function.
module Win32 =
[<DllImport("user32.dll", CharSet = CharSet.Unicode)>]
extern int MessageBox(IntPtr hWnd, String text, String caption, uint ``type``)
type AClass() =
// Add some attributes to Win32CallMethod.
[<Obsolete "This method is obsolete. Use managed MsgBox instead.">]
[<Unmanaged(UnmanagedType.User)>]
member _.Win32CallMethod () =
Win32.MessageBox(0, "This is an unmanaged call.", "Caution!", 0u)
// Get the AClass type to access its metadata.
let clsType = typeof<AClass>
// Get the type information for Win32CallMethod.
let mInfo = clsType.GetMethod "Win32CallMethod"
if mInfo <> null then
// Iterate through all the attributes of the method.
for attr in Attribute.GetCustomAttributes mInfo do
match attr with
// Check for the Obsolete attribute.
| :? ObsoleteAttribute as attr ->
printfn $"Method {mInfo.Name} is obsolete. The message is:"
printfn $" \"{attr.Message}\""
// Check for the Unmanaged attribute.
| :? UnmanagedAttribute as attr ->
printfn "This method calls unmanaged code."
printfn $"The Unmanaged attribute type is {attr.Win32Type}."
let myCls = AClass()
myCls.Win32CallMethod() |> ignore
| _ -> ()
// This code example produces the following results.
//
// First, the compilation yields the warning, "... This method is
// obsolete. Use managed MsgBox instead."
// Second, execution yields a message box with a title of "Caution!"
// and message text of "This is an unmanaged call."
// Third, the following text is displayed in the console window:
// Method Win32CallMethod is obsolete. The message is:
// "This method is obsolete. Use managed MsgBox instead."
// This method calls unmanaged code.
// The Unmanaged attribute type is User.
Imports System.Reflection
Imports System.Security
Imports System.Runtime.InteropServices
' Define an enumeration of Win32 unmanaged types
Public Enum UnmanagedType
User
GDI
Kernel
Shell
Networking
Multimedia
End Enum 'UnmanagedType
' Define the Unmanaged attribute.
Public Class UnmanagedAttribute
Inherits Attribute
' Storage for the UnmanagedType value.
Protected thisType As UnmanagedType
' Set the unmanaged type in the constructor.
Public Sub New(ByVal type As UnmanagedType)
thisType = type
End Sub
' Define a property to get and set the UnmanagedType value.
Public Property Win32Type() As UnmanagedType
Get
Return thisType
End Get
Set
thisType = Win32Type
End Set
End Property
End Class
' Create a class for an imported Win32 unmanaged function.
Public Class Win32
<DllImport("user32.dll", CharSet:=CharSet.Unicode)> _
Public Shared Function MessageBox(ByVal hWnd As Integer, _
ByVal Text As String, _
ByVal caption As String, _
ByVal type As Integer) As Integer
End Function 'MessageBox
End Class
Public Class AClass
' Add some attributes to Win32CallMethod.
<Obsolete("This method is obsolete. Use managed MsgBox instead."), _
Unmanaged(UnmanagedType.User)> _
Public Sub Win32CallMethod()
Win32.MessageBox(0, "This is an unmanaged call.", "Caution!", 0)
End Sub
End Class
Class DemoClass
Shared Sub Main(ByVal args() As String)
' Get the AClass type to access its metadata.
Dim clsType As Type = GetType(AClass)
' Get the type information for Win32CallMethod.
Dim mInfo As MethodInfo = clsType.GetMethod("Win32CallMethod")
If Not (mInfo Is Nothing) Then
' Iterate through all the attributes of the method.
Dim attr As Attribute
For Each attr In Attribute.GetCustomAttributes(mInfo)
' Check for the Obsolete attribute.
If attr.GetType().Equals(GetType(ObsoleteAttribute)) Then
Console.WriteLine("Method {0} is obsolete. The message is:", mInfo.Name)
Console.WriteLine(" ""{0}""", CType(attr, ObsoleteAttribute).Message)
' Check for the Unmanaged attribute.
ElseIf attr.GetType().Equals(GetType(UnmanagedAttribute)) Then
Console.WriteLine("This method calls unmanaged code.")
Console.WriteLine( _
String.Format("The Unmanaged attribute type is {0}.", _
CType(attr, UnmanagedAttribute).Win32Type))
Dim myCls As New AClass()
myCls.Win32CallMethod()
End If
Next attr
End If
End Sub
End Class
'
'This code example produces the following results.
'
'First, the compilation yields the warning, "... This method is
'obsolete. Use managed MsgBox instead."
'Second, execution yields a message box with a title of "Caution!"
'and message text of "This is an unmanaged call."
'Third, the following text is displayed in the console window:
'
'Method Win32CallMethod is obsolete. The message is:
' "This method is obsolete. Use managed MsgBox instead."
'This method calls unmanaged code.
'The Unmanaged attribute type is User.
'
Commenti
Il valore restituito contiene gli attributi personalizzati per i predecessori di element.
Nota
A partire da .NET Framework versione 2.0, questo metodo restituisce attributi di sicurezza per metodi, costruttori e tipi se gli attributi vengono archiviati nel nuovo formato di metadati. Gli assembly compilati con la versione 2.0 o successiva usano il nuovo formato. Gli assembly dinamici e gli assembly compilati con le versioni precedenti di .NET Framework usano il formato XML precedente. Vedere creazione di attributi di sicurezza dichiarativi.
Si applica a
GetCustomAttributes(Assembly, Type, Boolean)
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
Recupera una matrice degli attributi personalizzati applicati a un assembly. I parametri specificano l'assembly, il tipo dell'attributo personalizzato da cercare e un'opzione di ricerca ignorata.
public:
static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::Assembly ^ element, Type ^ attributeType, bool inherit);public static Attribute[] GetCustomAttributes (System.Reflection.Assembly element, Type attributeType, bool inherit);static member GetCustomAttributes : System.Reflection.Assembly * Type * bool -> Attribute[]Public Shared Function GetCustomAttributes (element As Assembly, attributeType As Type, inherit As Boolean) As Attribute()Parametri
- element
- Assembly
Oggetto derivato dalla classe Assembly che descrive una raccolta riutilizzabile di moduli.
- attributeType
- Type
Tipo, o tipo di base, dell'attributo personalizzato da cercare.
- inherit
- Boolean
Questo parametro viene ignorato e non influisce sull'operazione di questo metodo.
Restituisce
Matrice Attribute che contiene gli attributi personalizzati di tipo attributeType applicati a elemento una matrice vuota se non esistono attributi personalizzati di questo tipo.
Eccezioni
element o attributeType è null.
attributeType non deriva da Attribute.
Esempio
Nell'esempio di codice seguente viene illustrato l'uso di GetCustomAttributes, accettando un Assembly come parametro.
using namespace System;
using namespace System::Reflection;
[assembly:AssemblyTitle("CustAttrs1CPP")];
[assembly:AssemblyDescription("GetCustomAttributes() Demo")];
[assembly:AssemblyCompany("Microsoft")];
ref class Example
{};
static void main()
{
Type^ clsType = Example::typeid;
// Get the Assembly type to access its metadata.
Assembly^ assy = clsType->Assembly;
// Iterate through the attributes for the assembly.
System::Collections::IEnumerator^ myEnum = Attribute::GetCustomAttributes( assy )->GetEnumerator();
while ( myEnum->MoveNext() )
{
Attribute^ attr = safe_cast<Attribute^>(myEnum->Current);
// Check for the AssemblyTitle attribute.
if ( attr->GetType() == AssemblyTitleAttribute::typeid )
Console::WriteLine( "Assembly title is \"{0}\".", (dynamic_cast<AssemblyTitleAttribute^>(attr))->Title );
// Check for the AssemblyDescription attribute.
else
// Check for the AssemblyDescription attribute.
if ( attr->GetType() == AssemblyDescriptionAttribute::typeid )
Console::WriteLine( "Assembly description is \"{0}\".", (dynamic_cast<AssemblyDescriptionAttribute^>(attr))->Description );
// Check for the AssemblyCompany attribute.
else if ( attr->GetType() == AssemblyCompanyAttribute::typeid )
Console::WriteLine( "Assembly company is {0}.", (dynamic_cast<AssemblyCompanyAttribute^>(attr))->Company );
}
}
// The example displays the following output:
// Assembly description is "GetCustomAttributes() Demo".
// Assembly company is Microsoft.
// Assembly title is "CustAttrs1CPP".
using System;
using System.Reflection;
[assembly: AssemblyTitle("CustAttrs1CS")]
[assembly: AssemblyDescription("GetCustomAttributes() Demo")]
[assembly: AssemblyCompany("Microsoft")]
class Example {
static void Main() {
// Get the Assembly object to access its metadata.
Assembly assy = typeof(Example).Assembly;
// Iterate through the attributes for the assembly.
foreach(Attribute attr in Attribute.GetCustomAttributes(assy)) {
// Check for the AssemblyTitle attribute.
if (attr.GetType() == typeof(AssemblyTitleAttribute))
Console.WriteLine("Assembly title is \"{0}\".",
((AssemblyTitleAttribute)attr).Title);
// Check for the AssemblyDescription attribute.
else if (attr.GetType() ==
typeof(AssemblyDescriptionAttribute))
Console.WriteLine("Assembly description is \"{0}\".",
((AssemblyDescriptionAttribute)attr).Description);
// Check for the AssemblyCompany attribute.
else if (attr.GetType() == typeof(AssemblyCompanyAttribute))
Console.WriteLine("Assembly company is {0}.",
((AssemblyCompanyAttribute)attr).Company);
}
}
}
// The example displays the following output:
// Assembly title is "CustAttrs1CS".
// Assembly description is "GetCustomAttributes() Demo".
// Assembly company is Microsoft.
open System
open System.Reflection
[<assembly: AssemblyTitle "CustAttrs1CS">]
[<assembly: AssemblyDescription "GetCustomAttributes() Demo">]
[<assembly: AssemblyCompany"Microsoft">]
do ()
type Example = class end
// Get the Assembly object to access its metadata.
let assembly = typeof<Example>.Assembly
// Iterate through the attributes for the assembly.
for attr in Attribute.GetCustomAttributes assembly do
match attr with
// Check for the AssemblyTitle attribute.
| :? AssemblyTitleAttribute as attr ->
printfn $"Assembly title is \"{attr.Title}\"."
// Check for the AssemblyDescription attribute.
| :? AssemblyDescriptionAttribute as attr ->
printfn $"Assembly description is \"{attr.Description}\"."
// Check for the AssemblyCompany attribute.
| :? AssemblyCompanyAttribute as attr ->
printfn $"Assembly company is {attr.Company}."
| _ -> ()
// The example displays the following output:
// Assembly title is "CustAttrs1CS".
// Assembly description is "GetCustomAttributes() Demo".
// Assembly company is Microsoft.
Imports System.Reflection
<Assembly: AssemblyTitle("CustAttrs1VB")>
<Assembly: AssemblyDescription("GetCustomAttributes() Demo")>
<Assembly: AssemblyCompany("Microsoft")>
Module Example
Sub Main()
' Get the Assembly type to access its metadata.
Dim assy As Reflection.Assembly = GetType(Example).Assembly
' Iterate through all the attributes for the assembly.
For Each attr As Attribute In Attribute.GetCustomAttributes(assy)
' Check for the AssemblyTitle attribute.
If TypeOf attr Is AssemblyTitleAttribute Then
' Convert the attribute to access its data.
Dim attrTitle As AssemblyTitleAttribute = _
CType(attr, AssemblyTitleAttribute)
Console.WriteLine("Assembly title is ""{0}"".", _
attrTitle.Title)
' Check for the AssemblyDescription attribute.
ElseIf TypeOf attr Is AssemblyDescriptionAttribute Then
' Convert the attribute to access its data.
Dim attrDesc As AssemblyDescriptionAttribute = _
CType(attr, AssemblyDescriptionAttribute)
Console.WriteLine("Assembly description is ""{0}"".", _
attrDesc.Description)
' Check for the AssemblyCompany attribute.
ElseIf TypeOf attr Is AssemblyCompanyAttribute Then
' Convert the attribute to access its data.
Dim attrComp As AssemblyCompanyAttribute = _
CType(attr, AssemblyCompanyAttribute)
Console.WriteLine("Assembly company is {0}.", _
attrComp.Company)
End If
Next
End Sub
End Module
' The example displays the following output:
' Assembly company is Microsoft.
' Assembly description is "GetCustomAttributes() Demo".
' Assembly title is "CustAttrs1VB".
Commenti
Nota
A partire da .NET Framework versione 2.0, questo metodo restituisce gli attributi di sicurezza se gli attributi vengono archiviati nel nuovo formato di metadati. Gli assembly compilati con la versione 2.0 o successiva usano il nuovo formato. Gli assembly dinamici e gli assembly compilati con le versioni precedenti di .NET Framework usano il formato XML precedente. Vedere creazione di attributi di sicurezza dichiarativi.
Si applica a
GetCustomAttributes(Module, Type)
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
Recupera una matrice degli attributi personalizzati applicati a un modulo. I parametri specificano il modulo e il tipo dell'attributo personalizzato da cercare.
public:
static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::Module ^ element, Type ^ attributeType);public static Attribute[] GetCustomAttributes (System.Reflection.Module element, Type attributeType);static member GetCustomAttributes : System.Reflection.Module * Type -> Attribute[]Public Shared Function GetCustomAttributes (element As Module, attributeType As Type) As Attribute()Parametri
- attributeType
- Type
Tipo, o tipo di base, dell'attributo personalizzato da cercare.
Restituisce
Matrice Attribute che contiene gli attributi personalizzati di tipo attributeType applicati a elemento una matrice vuota se non esistono attributi personalizzati di questo tipo.
Eccezioni
element o attributeType è null.
attributeType non deriva da Attribute.
Esempio
Nell'esempio di codice seguente viene illustrato l'uso di GetCustomAttributes, accettando un Module come parametro.
using namespace System;
using namespace System::Reflection;
using namespace System::ComponentModel;
// Assign some attributes to the module.
// Set the module's CLSCompliant attribute to false
// The CLSCompliant attribute is applicable for /target:module.
[module:Description("A sample description")];
[module:CLSCompliant(false)];
namespace CustAttrs2CS
{
ref class DemoClass
{
public:
static void Main()
{
Type^ clsType = DemoClass::typeid;
// Get the Module type to access its metadata.
Module^ module = clsType->Module;
// Iterate through all the attributes for the module.
System::Collections::IEnumerator^ myEnum1 = Attribute::GetCustomAttributes( module )->GetEnumerator();
while ( myEnum1->MoveNext() )
{
Attribute^ attr = safe_cast<Attribute^>(myEnum1->Current);
// Check for the Description attribute.
if ( attr->GetType() == DescriptionAttribute::typeid )
Console::WriteLine( "Module {0} has the description \"{1}\".", module->Name, (dynamic_cast<DescriptionAttribute^>(attr))->Description );
// Check for the CLSCompliant attribute.
else
// Check for the CLSCompliant attribute.
if ( attr->GetType() == CLSCompliantAttribute::typeid )
Console::WriteLine( "Module {0} {1} CLSCompliant.", module->Name, (dynamic_cast<CLSCompliantAttribute^>(attr))->IsCompliant ? (String^)"is" : "is not" );
}
}
};
}
/*
* Output:
* Module CustAttrs2CS.exe is not CLSCompliant.
* Module CustAttrs2CS.exe has the description "A sample description".
*/
using System;
using System.Reflection;
using System.ComponentModel;
// Assign some attributes to the module.
[module:Description("A sample description")]
// Set the module's CLSCompliant attribute to false
// The CLSCompliant attribute is applicable for /target:module.
[module:CLSCompliant(false)]
namespace CustAttrs2CS {
class DemoClass {
static void Main(string[] args) {
Type clsType = typeof(DemoClass);
// Get the Module type to access its metadata.
Module module = clsType.Module;
// Iterate through all the attributes for the module.
foreach(Attribute attr in Attribute.GetCustomAttributes(module)) {
// Check for the Description attribute.
if (attr.GetType() == typeof(DescriptionAttribute))
Console.WriteLine("Module {0} has the description " +
"\"{1}\".", module.Name,
((DescriptionAttribute)attr).Description);
// Check for the CLSCompliant attribute.
else if (attr.GetType() == typeof(CLSCompliantAttribute))
Console.WriteLine("Module {0} {1} CLSCompliant.",
module.Name,
((CLSCompliantAttribute)attr).IsCompliant ?
"is" : "is not");
}
}
}
}
/*
* Output:
* Module CustAttrs2CS.exe is not CLSCompliant.
* Module CustAttrs2CS.exe has the description "A sample description".
*/
open System
open System.ComponentModel
// Assign some attributes to the module.
[<``module``: Description "A sample description">]
// Set the module's CLSCompliant attribute to false
// The CLSCompliant attribute is applicable for /target:module.
[<``module``: CLSCompliant false>]
do ()
type DemoClass = class end
// Get the Module type to access its metadata.
let ilmodule = typeof<DemoClass>.Module
// Iterate through all the attributes for the module.
for attr in Attribute.GetCustomAttributes ilmodule do
match attr with
// Check for the Description attribute.
| :? DescriptionAttribute as attr ->
printfn $"Module {ilmodule.Name} has the description \"{attr.Description}\"."
// Check for the CLSCompliant attribute.
| :? CLSCompliantAttribute as attr ->
printfn $"""Module {ilmodule.Name} {if attr.IsCompliant then "is" else "is not"} CLSCompliant."""
| _ -> ()
// Output:
// Module CustAttrs2CS.exe is not CLSCompliant.
// Module CustAttrs2CS.exe has the description "A sample description".
Imports System.Reflection
Imports System.ComponentModel
' Give the Module some attributes.
<Module: Description("A sample description")>
' Make the CLSCompliant attribute False.
' The CLSCompliant attribute is applicable for /target:module.
<Module: CLSCompliant(False)>
Module DemoModule
Sub Main()
' Get the Module type to access its metadata.
Dim modType As Reflection.Module = GetType(DemoModule).Module
Dim attr As Attribute
' Iterate through all the attributes for the module.
For Each attr In Attribute.GetCustomAttributes(modType)
' Check for the Description attribute.
If TypeOf attr Is DescriptionAttribute Then
' Convert the attribute to access its data.
Dim descAttr As DescriptionAttribute = _
CType(attr, DescriptionAttribute)
Console.WriteLine("Module {0} has the description ""{1}"".", _
modType.Name, descAttr.Description)
' Check for the CLSCompliant attribute.
ElseIf TypeOf attr Is CLSCompliantAttribute Then
' Convert the attribute to access its data.
Dim CLSCompAttr As CLSCompliantAttribute = _
CType(attr, CLSCompliantAttribute)
Dim strCompliant As String
If CLSCompAttr.IsCompliant Then
strCompliant = "is"
Else
strCompliant = "is not"
End If
Console.WriteLine("Module {0} {1} CLSCompliant.", _
modType.Name, strCompliant)
End If
Next
End Sub
End Module
' Output:
' Module CustAttrs2VB.exe has the description "A sample description".
' Module CustAttrs2VB.exe is not CLSCompliant.
Si applica a
GetCustomAttributes(ParameterInfo, Type)
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
Recupera una matrice degli attributi personalizzati applicati a un parametro del metodo. I parametri specificano il parametro del metodo e il tipo dell'attributo personalizzato da cercare.
public:
static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::ParameterInfo ^ element, Type ^ attributeType);public static Attribute[] GetCustomAttributes (System.Reflection.ParameterInfo element, Type attributeType);static member GetCustomAttributes : System.Reflection.ParameterInfo * Type -> Attribute[]Public Shared Function GetCustomAttributes (element As ParameterInfo, attributeType As Type) As Attribute()Parametri
- element
- ParameterInfo
Oggetto derivato dalla classe ParameterInfo che descrive un parametro di un membro di una classe.
- attributeType
- Type
Tipo, o tipo di base, dell'attributo personalizzato da cercare.
Restituisce
Matrice Attribute che contiene gli attributi personalizzati di tipo attributeType applicati a elemento una matrice vuota se non esistono attributi personalizzati di questo tipo.
Eccezioni
element o attributeType è null.
attributeType non deriva da Attribute.
Non è possibile caricare un tipo di attributo personalizzato.
Esempio
Nell'esempio di codice seguente viene illustrato l'uso di GetCustomAttributes, accettando un ParameterInfo come parametro.
using namespace System;
using namespace System::Reflection;
using namespace System::ComponentModel;
namespace CustAttrs5CS
{
public ref class AClass
{
public:
void ParamArrayAndDesc(
// Add ParamArray and Description attributes.
[Description("This argument is a ParamArray")]
array<Int32>^args )
{}
};
ref class DemoClass
{
public:
static void Main()
{
// Get the Class type to access its metadata.
Type^ clsType = AClass::typeid;
// Get the type information for the method.
MethodInfo^ mInfo = clsType->GetMethod( "ParamArrayAndDesc" );
if ( mInfo != nullptr )
{
// Get the parameter information.
array<ParameterInfo^>^pInfo = mInfo->GetParameters();
if ( pInfo != nullptr )
{
// Iterate through all the attributes for the parameter.
System::Collections::IEnumerator^ myEnum4 = Attribute::GetCustomAttributes( pInfo[ 0 ] )->GetEnumerator();
while ( myEnum4->MoveNext() )
{
Attribute^ attr = safe_cast<Attribute^>(myEnum4->Current);
// Check for the ParamArray attribute.
if ( attr->GetType() == ParamArrayAttribute::typeid )
Console::WriteLine( "Parameter {0} for method {1} "
"has the ParamArray attribute.", pInfo[ 0 ]->Name, mInfo->Name );
// Check for the Description attribute.
else
// Check for the Description attribute.
if ( attr->GetType() == DescriptionAttribute::typeid )
{
Console::WriteLine( "Parameter {0} for method {1} "
"has a description attribute.", pInfo[ 0 ]->Name, mInfo->Name );
Console::WriteLine( "The description is: \"{0}\"", (dynamic_cast<DescriptionAttribute^>(attr))->Description );
}
}
}
}
}
};
}
/*
* Output:
* Parameter args for method ParamArrayAndDesc has the ParamArray attribute.
* Parameter args for method ParamArrayAndDesc has a description attribute.
* The description is: "This argument is a ParamArray"
*/
using System;
using System.Reflection;
using System.ComponentModel;
namespace CustAttrs5CS {
public class AClass {
public void ParamArrayAndDesc(
// Add ParamArray (with the keyword) and Description attributes.
[Description("This argument is a ParamArray")]
params int[] args)
{}
}
class DemoClass {
static void Main(string[] args) {
// Get the Class type to access its metadata.
Type clsType = typeof(AClass);
// Get the type information for the method.
MethodInfo mInfo = clsType.GetMethod("ParamArrayAndDesc");
if (mInfo != null) {
// Get the parameter information.
ParameterInfo[] pInfo = mInfo.GetParameters();
if (pInfo != null) {
// Iterate through all the attributes for the parameter.
foreach(Attribute attr in
Attribute.GetCustomAttributes(pInfo[0])) {
// Check for the ParamArray attribute.
if (attr.GetType() == typeof(ParamArrayAttribute))
Console.WriteLine("Parameter {0} for method {1} " +
"has the ParamArray attribute.",
pInfo[0].Name, mInfo.Name);
// Check for the Description attribute.
else if (attr.GetType() ==
typeof(DescriptionAttribute)) {
Console.WriteLine("Parameter {0} for method {1} " +
"has a description attribute.",
pInfo[0].Name, mInfo.Name);
Console.WriteLine("The description is: \"{0}\"",
((DescriptionAttribute)attr).Description);
}
}
}
}
}
}
}
/*
* Output:
* Parameter args for method ParamArrayAndDesc has the ParamArray attribute.
* Parameter args for method ParamArrayAndDesc has a description attribute.
* The description is: "This argument is a ParamArray"
*/
open System
open System.Reflection
open System.ComponentModel
type AClass() =
member _.ParamArrayAndDesc(
// Add ParamArray and Description attributes.
[<Description "This argument is a ParamArray">]
[<ParamArray>]
args: int[]) = ()
// Get the Class type to access its metadata.
let clsType = typeof<AClass>
// Get the type information for the method.
let mInfo = clsType.GetMethod "ParamArrayAndDesc"
if mInfo <> null then
// Get the parameter information.
let pInfo = mInfo.GetParameters()
if pInfo <> null then
// Iterate through all the attributes for the parameter.
for attr in Attribute.GetCustomAttributes pInfo[0] do
match attr with
// Check for the ParamArray attribute.
| :? ParamArrayAttribute ->
printfn $"Parameter {pInfo[0].Name} for method {mInfo.Name} has the ParamArray attribute."
// Check for the Description attribute.
| :? DescriptionAttribute as attr ->
printfn $"Parameter {pInfo[0].Name} for method {mInfo.Name} has a description attribute."
printfn $"The description is: \"{attr.Description}\""
| _ -> ()
// Output:
// Parameter args for method ParamArrayAndDesc has a description attribute.
// The description is: "This argument is a ParamArray"
// Parameter args for method ParamArrayAndDesc has the ParamArray attribute.
Imports System.Reflection
Imports System.ComponentModel
Module DemoModule
Public Class AClass
' Add Description and ParamArray (with the keyword) attributes.
Public Sub ParamArrayAndDesc( _
<Description("This argument is a ParamArray")> _
ByVal ParamArray args() As Integer)
End Sub
End Class
Sub Main()
' Get the Class type to access its metadata.
Dim clsType As Type = GetType(AClass)
' Get the type information for the method.
Dim mInfo As MethodInfo = clsType.GetMethod("ParamArrayAndDesc")
' Get the Parameter information for the method.
Dim pInfo() As ParameterInfo = mInfo.GetParameters()
Dim attr As Attribute
' Iterate through each attribute of the parameter.
For Each attr In Attribute.GetCustomAttributes(pInfo(0))
' Check for the ParamArray attribute.
If TypeOf attr Is ParamArrayAttribute Then
' Convert the attribute to access its data.
Dim paAttr As ParamArrayAttribute = _
CType(attr, ParamArrayAttribute)
Console.WriteLine("Parameter {0} for method {1} has the " + _
"ParamArray attribute.", pInfo(0).Name, mInfo.Name)
' Check for the Description attribute.
ElseIf TypeOf attr Is DescriptionAttribute Then
' Convert the attribute to access its data.
Dim descAttr As DescriptionAttribute = _
CType(attr, DescriptionAttribute)
Console.WriteLine("Parameter {0} for method {1} has a description " + _
"attribute. The description is:", pInfo(0).Name, mInfo.Name)
Console.WriteLine(descAttr.Description)
End If
Next
End Sub
End Module
' Output:
' Parameter args for method ParamArrayAndDesc has the ParamArray attribute.
' Parameter args for method ParamArrayAndDesc has a description attribute. The description is:
' This argument is a ParamArray
Commenti
Se element rappresenta un parametro in un metodo di un tipo derivato, il valore restituito include gli attributi personalizzati ereditabili applicati allo stesso parametro nei metodi di base sottoposti a override.
Si applica a
GetCustomAttributes(MemberInfo, Boolean)
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
Recupera una matrice degli attributi personalizzati applicati a un membro di un tipo. I parametri specificano il membro, il tipo dell'attributo personalizzato da cercare e se cercare i predecessori del membro.
public:
static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::MemberInfo ^ element, bool inherit);public static Attribute[] GetCustomAttributes (System.Reflection.MemberInfo element, bool inherit);static member GetCustomAttributes : System.Reflection.MemberInfo * bool -> Attribute[]Public Shared Function GetCustomAttributes (element As MemberInfo, inherit As Boolean) As Attribute()Parametri
- element
- MemberInfo
Oggetto derivato dalla classe MemberInfo che descrive un costruttore, un evento, un campo, un metodo o un membro della proprietà di una classe.
- inherit
- Boolean
Se true, specifica anche di cercare gli attributi personalizzati nei predecessori di element.
Restituisce
Matrice Attribute che contiene gli attributi personalizzati applicati a elemento una matrice vuota se tali attributi personalizzati non esistono.
Eccezioni
element è null.
element non è un costruttore, un metodo, una proprietà, un evento, un tipo o un campo.
Non è possibile caricare un tipo di attributo personalizzato.
Esempio
Nell'esempio di codice seguente viene illustrato l'uso di GetCustomAttributes, accettando un MemberInfo come parametro.
using namespace System;
using namespace System::Reflection;
using namespace System::Security;
using namespace System::Runtime::InteropServices;
namespace CustAttrs4CS
{
// Create a class for Win32 imported unmanaged functions.
public ref class Win32
{
public:
[DllImport("user32.dll", CharSet = CharSet::Unicode)]
static int MessageBox( int hWnd, String^ text, String^ caption, UInt32 type );
};
public ref class AClass
{
public:
// Add some attributes to the Win32CallMethod.
[Obsolete("This method is obsolete. Use managed MsgBox instead.")]
void Win32CallMethod()
{
Win32::MessageBox( 0, "This is an unmanaged call.", "Be Careful!", 0 );
}
};
ref class DemoClass
{
public:
static void Main()
{
// Get the Class type to access its metadata.
Type^ clsType = AClass::typeid;
// Get the type information for the Win32CallMethod.
MethodInfo^ mInfo = clsType->GetMethod( "Win32CallMethod" );
if ( mInfo != nullptr )
{
// Iterate through all the attributes for the method.
System::Collections::IEnumerator^ myEnum3 = Attribute::GetCustomAttributes( mInfo )->GetEnumerator();
while ( myEnum3->MoveNext() )
{
Attribute^ attr = safe_cast<Attribute^>(myEnum3->Current);
// Check for the Obsolete attribute.
if ( attr->GetType() == ObsoleteAttribute::typeid )
{
Console::WriteLine( "Method {0} is obsolete. "
"The message is:", mInfo->Name );
Console::WriteLine( (dynamic_cast<ObsoleteAttribute^>(attr))->Message );
}
// Check for the SuppressUnmanagedCodeSecurity attribute.
else
// Check for the SuppressUnmanagedCodeSecurity attribute.
if ( attr->GetType() == SuppressUnmanagedCodeSecurityAttribute::typeid )
{
Console::WriteLine( "This method calls unmanaged code "
"with no security check." );
Console::WriteLine( "Please do not use unless absolutely necessary." );
AClass^ myCls = gcnew AClass;
myCls->Win32CallMethod();
}
}
}
}
};
}
/*
* Output:
* Method Win32CallMethod is obsolete. The message is:
* This method is obsolete. Use managed MsgBox instead.
* This method calls unmanaged code with no security check.
* Please do not use unless absolutely necessary.
*/
using System;
using System.Reflection;
using System.Security;
using System.Runtime.InteropServices;
namespace CustAttrs4CS
{
// Define an enumeration of Win32 unmanaged types
public enum UnmanagedType
{
User,
GDI,
Kernel,
Shell,
Networking,
Multimedia
}
// Define the Unmanaged attribute.
public class UnmanagedAttribute : Attribute
{
// Storage for the UnmanagedType value.
protected UnmanagedType thisType;
// Set the unmanaged type in the constructor.
public UnmanagedAttribute(UnmanagedType type)
{
thisType = type;
}
// Define a property to get and set the UnmanagedType value.
public UnmanagedType Win32Type
{
get { return thisType; }
set { thisType = Win32Type; }
}
}
// Create a class for an imported Win32 unmanaged function.
public class Win32 {
[DllImport("user32.dll", CharSet = CharSet.Unicode)]
public static extern int MessageBox(int hWnd, String text,
String caption, uint type);
}
public class AClass {
// Add some attributes to Win32CallMethod.
[Obsolete("This method is obsolete. Use managed MsgBox instead.")]
[Unmanaged(UnmanagedType.User)]
public void Win32CallMethod()
{
Win32.MessageBox(0, "This is an unmanaged call.", "Caution!", 0);
}
}
class DemoClass {
static void Main(string[] args)
{
// Get the AClass type to access its metadata.
Type clsType = typeof(AClass);
// Get the type information for Win32CallMethod.
MethodInfo mInfo = clsType.GetMethod("Win32CallMethod");
if (mInfo != null)
{
// Iterate through all the attributes of the method.
foreach(Attribute attr in
Attribute.GetCustomAttributes(mInfo)) {
// Check for the Obsolete attribute.
if (attr.GetType() == typeof(ObsoleteAttribute))
{
Console.WriteLine("Method {0} is obsolete. " +
"The message is:",
mInfo.Name);
Console.WriteLine(" \"{0}\"",
((ObsoleteAttribute)attr).Message);
}
// Check for the Unmanaged attribute.
else if (attr.GetType() == typeof(UnmanagedAttribute))
{
Console.WriteLine(
"This method calls unmanaged code.");
Console.WriteLine(
String.Format("The Unmanaged attribute type is {0}.",
((UnmanagedAttribute)attr).Win32Type));
AClass myCls = new AClass();
myCls.Win32CallMethod();
}
}
}
}
}
}
/*
This code example produces the following results.
First, the compilation yields the warning, "... This method is
obsolete. Use managed MsgBox instead."
Second, execution yields a message box with a title of "Caution!"
and message text of "This is an unmanaged call."
Third, the following text is displayed in the console window:
Method Win32CallMethod is obsolete. The message is:
"This method is obsolete. Use managed MsgBox instead."
This method calls unmanaged code.
The Unmanaged attribute type is User.
*/
open System
open System.Runtime.InteropServices
// Define an enumeration of Win32 unmanaged types
type UnmanagedType =
| User = 0
| GDI = 1
| Kernel = 2
| Shell = 3
| Networking = 4
| Multimedia = 5
// Define the Unmanaged attribute.
type UnmanagedAttribute(unmanagedType) =
inherit Attribute()
// Define a property to get and set the UnmanagedType value.
member val Win32Type = unmanagedType with get, set
// Create a module for an imported Win32 unmanaged function.
module Win32 =
[<DllImport("user32.dll", CharSet = CharSet.Unicode)>]
extern int MessageBox(IntPtr hWnd, String text, String caption, uint ``type``)
type AClass() =
// Add some attributes to Win32CallMethod.
[<Obsolete "This method is obsolete. Use managed MsgBox instead.">]
[<Unmanaged(UnmanagedType.User)>]
member _.Win32CallMethod () =
Win32.MessageBox(0, "This is an unmanaged call.", "Caution!", 0u)
// Get the AClass type to access its metadata.
let clsType = typeof<AClass>
// Get the type information for Win32CallMethod.
let mInfo = clsType.GetMethod "Win32CallMethod"
if mInfo <> null then
// Iterate through all the attributes of the method.
for attr in Attribute.GetCustomAttributes mInfo do
match attr with
// Check for the Obsolete attribute.
| :? ObsoleteAttribute as attr ->
printfn $"Method {mInfo.Name} is obsolete. The message is:"
printfn $" \"{attr.Message}\""
// Check for the Unmanaged attribute.
| :? UnmanagedAttribute as attr ->
printfn "This method calls unmanaged code."
printfn $"The Unmanaged attribute type is {attr.Win32Type}."
let myCls = AClass()
myCls.Win32CallMethod() |> ignore
| _ -> ()
// This code example produces the following results.
//
// First, the compilation yields the warning, "... This method is
// obsolete. Use managed MsgBox instead."
// Second, execution yields a message box with a title of "Caution!"
// and message text of "This is an unmanaged call."
// Third, the following text is displayed in the console window:
// Method Win32CallMethod is obsolete. The message is:
// "This method is obsolete. Use managed MsgBox instead."
// This method calls unmanaged code.
// The Unmanaged attribute type is User.
Imports System.Reflection
Imports System.Security
Imports System.Runtime.InteropServices
' Define an enumeration of Win32 unmanaged types
Public Enum UnmanagedType
User
GDI
Kernel
Shell
Networking
Multimedia
End Enum 'UnmanagedType
' Define the Unmanaged attribute.
Public Class UnmanagedAttribute
Inherits Attribute
' Storage for the UnmanagedType value.
Protected thisType As UnmanagedType
' Set the unmanaged type in the constructor.
Public Sub New(ByVal type As UnmanagedType)
thisType = type
End Sub
' Define a property to get and set the UnmanagedType value.
Public Property Win32Type() As UnmanagedType
Get
Return thisType
End Get
Set
thisType = Win32Type
End Set
End Property
End Class
' Create a class for an imported Win32 unmanaged function.
Public Class Win32
<DllImport("user32.dll", CharSet:=CharSet.Unicode)> _
Public Shared Function MessageBox(ByVal hWnd As Integer, _
ByVal Text As String, _
ByVal caption As String, _
ByVal type As Integer) As Integer
End Function 'MessageBox
End Class
Public Class AClass
' Add some attributes to Win32CallMethod.
<Obsolete("This method is obsolete. Use managed MsgBox instead."), _
Unmanaged(UnmanagedType.User)> _
Public Sub Win32CallMethod()
Win32.MessageBox(0, "This is an unmanaged call.", "Caution!", 0)
End Sub
End Class
Class DemoClass
Shared Sub Main(ByVal args() As String)
' Get the AClass type to access its metadata.
Dim clsType As Type = GetType(AClass)
' Get the type information for Win32CallMethod.
Dim mInfo As MethodInfo = clsType.GetMethod("Win32CallMethod")
If Not (mInfo Is Nothing) Then
' Iterate through all the attributes of the method.
Dim attr As Attribute
For Each attr In Attribute.GetCustomAttributes(mInfo)
' Check for the Obsolete attribute.
If attr.GetType().Equals(GetType(ObsoleteAttribute)) Then
Console.WriteLine("Method {0} is obsolete. The message is:", mInfo.Name)
Console.WriteLine(" ""{0}""", CType(attr, ObsoleteAttribute).Message)
' Check for the Unmanaged attribute.
ElseIf attr.GetType().Equals(GetType(UnmanagedAttribute)) Then
Console.WriteLine("This method calls unmanaged code.")
Console.WriteLine( _
String.Format("The Unmanaged attribute type is {0}.", _
CType(attr, UnmanagedAttribute).Win32Type))
Dim myCls As New AClass()
myCls.Win32CallMethod()
End If
Next attr
End If
End Sub
End Class
'
'This code example produces the following results.
'
'First, the compilation yields the warning, "... This method is
'obsolete. Use managed MsgBox instead."
'Second, execution yields a message box with a title of "Caution!"
'and message text of "This is an unmanaged call."
'Third, the following text is displayed in the console window:
'
'Method Win32CallMethod is obsolete. The message is:
' "This method is obsolete. Use managed MsgBox instead."
'This method calls unmanaged code.
'The Unmanaged attribute type is User.
'
Commenti
Il valore restituito contiene gli attributi personalizzati per i predecessori di element se inherit è true.
Nota
A partire da .NET Framework versione 2.0, questo metodo restituisce attributi di sicurezza per metodi, costruttori e tipi se gli attributi vengono archiviati nel nuovo formato di metadati. Gli assembly compilati con la versione 2.0 o successiva usano il nuovo formato. Gli assembly dinamici e gli assembly compilati con le versioni precedenti di .NET Framework usano il formato XML precedente. Vedere creazione di attributi di sicurezza dichiarativi.
Si applica a
GetCustomAttributes(Assembly, Type)
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
Recupera una matrice degli attributi personalizzati applicati a un assembly. I parametri specificano l'assembly e il tipo dell'attributo personalizzato da cercare.
public:
static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::Assembly ^ element, Type ^ attributeType);public static Attribute[] GetCustomAttributes (System.Reflection.Assembly element, Type attributeType);static member GetCustomAttributes : System.Reflection.Assembly * Type -> Attribute[]Public Shared Function GetCustomAttributes (element As Assembly, attributeType As Type) As Attribute()Parametri
- element
- Assembly
Oggetto derivato dalla classe Assembly che descrive una raccolta riutilizzabile di moduli.
- attributeType
- Type
Tipo, o tipo di base, dell'attributo personalizzato da cercare.
Restituisce
Matrice Attribute che contiene gli attributi personalizzati di tipo attributeType applicati a elemento una matrice vuota se non esistono attributi personalizzati di questo tipo.
Eccezioni
element o attributeType è null.
attributeType non deriva da Attribute.
Esempio
Nell'esempio di codice seguente viene illustrato l'uso di GetCustomAttributes, accettando un Assembly come parametro.
using namespace System;
using namespace System::Reflection;
[assembly:AssemblyTitle("CustAttrs1CPP")];
[assembly:AssemblyDescription("GetCustomAttributes() Demo")];
[assembly:AssemblyCompany("Microsoft")];
ref class Example
{};
static void main()
{
Type^ clsType = Example::typeid;
// Get the Assembly type to access its metadata.
Assembly^ assy = clsType->Assembly;
// Iterate through the attributes for the assembly.
System::Collections::IEnumerator^ myEnum = Attribute::GetCustomAttributes( assy )->GetEnumerator();
while ( myEnum->MoveNext() )
{
Attribute^ attr = safe_cast<Attribute^>(myEnum->Current);
// Check for the AssemblyTitle attribute.
if ( attr->GetType() == AssemblyTitleAttribute::typeid )
Console::WriteLine( "Assembly title is \"{0}\".", (dynamic_cast<AssemblyTitleAttribute^>(attr))->Title );
// Check for the AssemblyDescription attribute.
else
// Check for the AssemblyDescription attribute.
if ( attr->GetType() == AssemblyDescriptionAttribute::typeid )
Console::WriteLine( "Assembly description is \"{0}\".", (dynamic_cast<AssemblyDescriptionAttribute^>(attr))->Description );
// Check for the AssemblyCompany attribute.
else if ( attr->GetType() == AssemblyCompanyAttribute::typeid )
Console::WriteLine( "Assembly company is {0}.", (dynamic_cast<AssemblyCompanyAttribute^>(attr))->Company );
}
}
// The example displays the following output:
// Assembly description is "GetCustomAttributes() Demo".
// Assembly company is Microsoft.
// Assembly title is "CustAttrs1CPP".
using System;
using System.Reflection;
[assembly: AssemblyTitle("CustAttrs1CS")]
[assembly: AssemblyDescription("GetCustomAttributes() Demo")]
[assembly: AssemblyCompany("Microsoft")]
class Example {
static void Main() {
// Get the Assembly object to access its metadata.
Assembly assy = typeof(Example).Assembly;
// Iterate through the attributes for the assembly.
foreach(Attribute attr in Attribute.GetCustomAttributes(assy)) {
// Check for the AssemblyTitle attribute.
if (attr.GetType() == typeof(AssemblyTitleAttribute))
Console.WriteLine("Assembly title is \"{0}\".",
((AssemblyTitleAttribute)attr).Title);
// Check for the AssemblyDescription attribute.
else if (attr.GetType() ==
typeof(AssemblyDescriptionAttribute))
Console.WriteLine("Assembly description is \"{0}\".",
((AssemblyDescriptionAttribute)attr).Description);
// Check for the AssemblyCompany attribute.
else if (attr.GetType() == typeof(AssemblyCompanyAttribute))
Console.WriteLine("Assembly company is {0}.",
((AssemblyCompanyAttribute)attr).Company);
}
}
}
// The example displays the following output:
// Assembly title is "CustAttrs1CS".
// Assembly description is "GetCustomAttributes() Demo".
// Assembly company is Microsoft.
open System
open System.Reflection
[<assembly: AssemblyTitle "CustAttrs1CS">]
[<assembly: AssemblyDescription "GetCustomAttributes() Demo">]
[<assembly: AssemblyCompany"Microsoft">]
do ()
type Example = class end
// Get the Assembly object to access its metadata.
let assembly = typeof<Example>.Assembly
// Iterate through the attributes for the assembly.
for attr in Attribute.GetCustomAttributes assembly do
match attr with
// Check for the AssemblyTitle attribute.
| :? AssemblyTitleAttribute as attr ->
printfn $"Assembly title is \"{attr.Title}\"."
// Check for the AssemblyDescription attribute.
| :? AssemblyDescriptionAttribute as attr ->
printfn $"Assembly description is \"{attr.Description}\"."
// Check for the AssemblyCompany attribute.
| :? AssemblyCompanyAttribute as attr ->
printfn $"Assembly company is {attr.Company}."
| _ -> ()
// The example displays the following output:
// Assembly title is "CustAttrs1CS".
// Assembly description is "GetCustomAttributes() Demo".
// Assembly company is Microsoft.
Imports System.Reflection
<Assembly: AssemblyTitle("CustAttrs1VB")>
<Assembly: AssemblyDescription("GetCustomAttributes() Demo")>
<Assembly: AssemblyCompany("Microsoft")>
Module Example
Sub Main()
' Get the Assembly type to access its metadata.
Dim assy As Reflection.Assembly = GetType(Example).Assembly
' Iterate through all the attributes for the assembly.
For Each attr As Attribute In Attribute.GetCustomAttributes(assy)
' Check for the AssemblyTitle attribute.
If TypeOf attr Is AssemblyTitleAttribute Then
' Convert the attribute to access its data.
Dim attrTitle As AssemblyTitleAttribute = _
CType(attr, AssemblyTitleAttribute)
Console.WriteLine("Assembly title is ""{0}"".", _
attrTitle.Title)
' Check for the AssemblyDescription attribute.
ElseIf TypeOf attr Is AssemblyDescriptionAttribute Then
' Convert the attribute to access its data.
Dim attrDesc As AssemblyDescriptionAttribute = _
CType(attr, AssemblyDescriptionAttribute)
Console.WriteLine("Assembly description is ""{0}"".", _
attrDesc.Description)
' Check for the AssemblyCompany attribute.
ElseIf TypeOf attr Is AssemblyCompanyAttribute Then
' Convert the attribute to access its data.
Dim attrComp As AssemblyCompanyAttribute = _
CType(attr, AssemblyCompanyAttribute)
Console.WriteLine("Assembly company is {0}.", _
attrComp.Company)
End If
Next
End Sub
End Module
' The example displays the following output:
' Assembly company is Microsoft.
' Assembly description is "GetCustomAttributes() Demo".
' Assembly title is "CustAttrs1VB".
Commenti
Nota
A partire da .NET Framework versione 2.0, questo metodo restituisce gli attributi di sicurezza se gli attributi vengono archiviati nel nuovo formato di metadati. Gli assembly compilati con la versione 2.0 o successiva usano il nuovo formato. Gli assembly dinamici e gli assembly compilati con le versioni precedenti di .NET Framework usano il formato XML precedente. Vedere creazione di attributi di sicurezza dichiarativi.
Si applica a
GetCustomAttributes(Assembly, Boolean)
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
Recupera una matrice degli attributi personalizzati applicati a un assembly. I parametri specificano l'assembly e un'opzione di ricerca ignorata.
public:
static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::Assembly ^ element, bool inherit);public static Attribute[] GetCustomAttributes (System.Reflection.Assembly element, bool inherit);static member GetCustomAttributes : System.Reflection.Assembly * bool -> Attribute[]Public Shared Function GetCustomAttributes (element As Assembly, inherit As Boolean) As Attribute()Parametri
- element
- Assembly
Oggetto derivato dalla classe Assembly che descrive una raccolta riutilizzabile di moduli.
- inherit
- Boolean
Questo parametro viene ignorato e non influisce sull'operazione di questo metodo.
Restituisce
Matrice Attribute che contiene gli attributi personalizzati applicati a elemento una matrice vuota se tali attributi personalizzati non esistono.
Eccezioni
element è null.
Esempio
Nell'esempio di codice seguente viene illustrato l'uso di GetCustomAttributes, accettando un Assembly come parametro.
using namespace System;
using namespace System::Reflection;
[assembly:AssemblyTitle("CustAttrs1CPP")];
[assembly:AssemblyDescription("GetCustomAttributes() Demo")];
[assembly:AssemblyCompany("Microsoft")];
ref class Example
{};
static void main()
{
Type^ clsType = Example::typeid;
// Get the Assembly type to access its metadata.
Assembly^ assy = clsType->Assembly;
// Iterate through the attributes for the assembly.
System::Collections::IEnumerator^ myEnum = Attribute::GetCustomAttributes( assy )->GetEnumerator();
while ( myEnum->MoveNext() )
{
Attribute^ attr = safe_cast<Attribute^>(myEnum->Current);
// Check for the AssemblyTitle attribute.
if ( attr->GetType() == AssemblyTitleAttribute::typeid )
Console::WriteLine( "Assembly title is \"{0}\".", (dynamic_cast<AssemblyTitleAttribute^>(attr))->Title );
// Check for the AssemblyDescription attribute.
else
// Check for the AssemblyDescription attribute.
if ( attr->GetType() == AssemblyDescriptionAttribute::typeid )
Console::WriteLine( "Assembly description is \"{0}\".", (dynamic_cast<AssemblyDescriptionAttribute^>(attr))->Description );
// Check for the AssemblyCompany attribute.
else if ( attr->GetType() == AssemblyCompanyAttribute::typeid )
Console::WriteLine( "Assembly company is {0}.", (dynamic_cast<AssemblyCompanyAttribute^>(attr))->Company );
}
}
// The example displays the following output:
// Assembly description is "GetCustomAttributes() Demo".
// Assembly company is Microsoft.
// Assembly title is "CustAttrs1CPP".
using System;
using System.Reflection;
[assembly: AssemblyTitle("CustAttrs1CS")]
[assembly: AssemblyDescription("GetCustomAttributes() Demo")]
[assembly: AssemblyCompany("Microsoft")]
class Example {
static void Main() {
// Get the Assembly object to access its metadata.
Assembly assy = typeof(Example).Assembly;
// Iterate through the attributes for the assembly.
foreach(Attribute attr in Attribute.GetCustomAttributes(assy)) {
// Check for the AssemblyTitle attribute.
if (attr.GetType() == typeof(AssemblyTitleAttribute))
Console.WriteLine("Assembly title is \"{0}\".",
((AssemblyTitleAttribute)attr).Title);
// Check for the AssemblyDescription attribute.
else if (attr.GetType() ==
typeof(AssemblyDescriptionAttribute))
Console.WriteLine("Assembly description is \"{0}\".",
((AssemblyDescriptionAttribute)attr).Description);
// Check for the AssemblyCompany attribute.
else if (attr.GetType() == typeof(AssemblyCompanyAttribute))
Console.WriteLine("Assembly company is {0}.",
((AssemblyCompanyAttribute)attr).Company);
}
}
}
// The example displays the following output:
// Assembly title is "CustAttrs1CS".
// Assembly description is "GetCustomAttributes() Demo".
// Assembly company is Microsoft.
open System
open System.Reflection
[<assembly: AssemblyTitle "CustAttrs1CS">]
[<assembly: AssemblyDescription "GetCustomAttributes() Demo">]
[<assembly: AssemblyCompany"Microsoft">]
do ()
type Example = class end
// Get the Assembly object to access its metadata.
let assembly = typeof<Example>.Assembly
// Iterate through the attributes for the assembly.
for attr in Attribute.GetCustomAttributes assembly do
match attr with
// Check for the AssemblyTitle attribute.
| :? AssemblyTitleAttribute as attr ->
printfn $"Assembly title is \"{attr.Title}\"."
// Check for the AssemblyDescription attribute.
| :? AssemblyDescriptionAttribute as attr ->
printfn $"Assembly description is \"{attr.Description}\"."
// Check for the AssemblyCompany attribute.
| :? AssemblyCompanyAttribute as attr ->
printfn $"Assembly company is {attr.Company}."
| _ -> ()
// The example displays the following output:
// Assembly title is "CustAttrs1CS".
// Assembly description is "GetCustomAttributes() Demo".
// Assembly company is Microsoft.
Imports System.Reflection
<Assembly: AssemblyTitle("CustAttrs1VB")>
<Assembly: AssemblyDescription("GetCustomAttributes() Demo")>
<Assembly: AssemblyCompany("Microsoft")>
Module Example
Sub Main()
' Get the Assembly type to access its metadata.
Dim assy As Reflection.Assembly = GetType(Example).Assembly
' Iterate through all the attributes for the assembly.
For Each attr As Attribute In Attribute.GetCustomAttributes(assy)
' Check for the AssemblyTitle attribute.
If TypeOf attr Is AssemblyTitleAttribute Then
' Convert the attribute to access its data.
Dim attrTitle As AssemblyTitleAttribute = _
CType(attr, AssemblyTitleAttribute)
Console.WriteLine("Assembly title is ""{0}"".", _
attrTitle.Title)
' Check for the AssemblyDescription attribute.
ElseIf TypeOf attr Is AssemblyDescriptionAttribute Then
' Convert the attribute to access its data.
Dim attrDesc As AssemblyDescriptionAttribute = _
CType(attr, AssemblyDescriptionAttribute)
Console.WriteLine("Assembly description is ""{0}"".", _
attrDesc.Description)
' Check for the AssemblyCompany attribute.
ElseIf TypeOf attr Is AssemblyCompanyAttribute Then
' Convert the attribute to access its data.
Dim attrComp As AssemblyCompanyAttribute = _
CType(attr, AssemblyCompanyAttribute)
Console.WriteLine("Assembly company is {0}.", _
attrComp.Company)
End If
Next
End Sub
End Module
' The example displays the following output:
' Assembly company is Microsoft.
' Assembly description is "GetCustomAttributes() Demo".
' Assembly title is "CustAttrs1VB".
Si applica a
GetCustomAttributes(ParameterInfo)
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
Recupera una matrice degli attributi personalizzati applicati a un parametro del metodo. Un parametro specifica il parametro del metodo.
public:
static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::ParameterInfo ^ element);public static Attribute[] GetCustomAttributes (System.Reflection.ParameterInfo element);static member GetCustomAttributes : System.Reflection.ParameterInfo -> Attribute[]Public Shared Function GetCustomAttributes (element As ParameterInfo) As Attribute()Parametri
- element
- ParameterInfo
Oggetto derivato dalla classe ParameterInfo che descrive un parametro di un membro di una classe.
Restituisce
Matrice Attribute che contiene gli attributi personalizzati applicati a elemento una matrice vuota se tali attributi personalizzati non esistono.
Eccezioni
element è null.
Non è possibile caricare un tipo di attributo personalizzato.
Esempio
Nell'esempio di codice seguente viene illustrato l'uso di GetCustomAttributes, accettando un ParameterInfo come parametro.
using namespace System;
using namespace System::Reflection;
using namespace System::ComponentModel;
namespace CustAttrs5CS
{
public ref class AClass
{
public:
void ParamArrayAndDesc(
// Add ParamArray and Description attributes.
[Description("This argument is a ParamArray")]
array<Int32>^args )
{}
};
ref class DemoClass
{
public:
static void Main()
{
// Get the Class type to access its metadata.
Type^ clsType = AClass::typeid;
// Get the type information for the method.
MethodInfo^ mInfo = clsType->GetMethod( "ParamArrayAndDesc" );
if ( mInfo != nullptr )
{
// Get the parameter information.
array<ParameterInfo^>^pInfo = mInfo->GetParameters();
if ( pInfo != nullptr )
{
// Iterate through all the attributes for the parameter.
System::Collections::IEnumerator^ myEnum4 = Attribute::GetCustomAttributes( pInfo[ 0 ] )->GetEnumerator();
while ( myEnum4->MoveNext() )
{
Attribute^ attr = safe_cast<Attribute^>(myEnum4->Current);
// Check for the ParamArray attribute.
if ( attr->GetType() == ParamArrayAttribute::typeid )
Console::WriteLine( "Parameter {0} for method {1} "
"has the ParamArray attribute.", pInfo[ 0 ]->Name, mInfo->Name );
// Check for the Description attribute.
else
// Check for the Description attribute.
if ( attr->GetType() == DescriptionAttribute::typeid )
{
Console::WriteLine( "Parameter {0} for method {1} "
"has a description attribute.", pInfo[ 0 ]->Name, mInfo->Name );
Console::WriteLine( "The description is: \"{0}\"", (dynamic_cast<DescriptionAttribute^>(attr))->Description );
}
}
}
}
}
};
}
/*
* Output:
* Parameter args for method ParamArrayAndDesc has the ParamArray attribute.
* Parameter args for method ParamArrayAndDesc has a description attribute.
* The description is: "This argument is a ParamArray"
*/
using System;
using System.Reflection;
using System.ComponentModel;
namespace CustAttrs5CS {
public class AClass {
public void ParamArrayAndDesc(
// Add ParamArray (with the keyword) and Description attributes.
[Description("This argument is a ParamArray")]
params int[] args)
{}
}
class DemoClass {
static void Main(string[] args) {
// Get the Class type to access its metadata.
Type clsType = typeof(AClass);
// Get the type information for the method.
MethodInfo mInfo = clsType.GetMethod("ParamArrayAndDesc");
if (mInfo != null) {
// Get the parameter information.
ParameterInfo[] pInfo = mInfo.GetParameters();
if (pInfo != null) {
// Iterate through all the attributes for the parameter.
foreach(Attribute attr in
Attribute.GetCustomAttributes(pInfo[0])) {
// Check for the ParamArray attribute.
if (attr.GetType() == typeof(ParamArrayAttribute))
Console.WriteLine("Parameter {0} for method {1} " +
"has the ParamArray attribute.",
pInfo[0].Name, mInfo.Name);
// Check for the Description attribute.
else if (attr.GetType() ==
typeof(DescriptionAttribute)) {
Console.WriteLine("Parameter {0} for method {1} " +
"has a description attribute.",
pInfo[0].Name, mInfo.Name);
Console.WriteLine("The description is: \"{0}\"",
((DescriptionAttribute)attr).Description);
}
}
}
}
}
}
}
/*
* Output:
* Parameter args for method ParamArrayAndDesc has the ParamArray attribute.
* Parameter args for method ParamArrayAndDesc has a description attribute.
* The description is: "This argument is a ParamArray"
*/
open System
open System.Reflection
open System.ComponentModel
type AClass() =
member _.ParamArrayAndDesc(
// Add ParamArray and Description attributes.
[<Description "This argument is a ParamArray">]
[<ParamArray>]
args: int[]) = ()
// Get the Class type to access its metadata.
let clsType = typeof<AClass>
// Get the type information for the method.
let mInfo = clsType.GetMethod "ParamArrayAndDesc"
if mInfo <> null then
// Get the parameter information.
let pInfo = mInfo.GetParameters()
if pInfo <> null then
// Iterate through all the attributes for the parameter.
for attr in Attribute.GetCustomAttributes pInfo[0] do
match attr with
// Check for the ParamArray attribute.
| :? ParamArrayAttribute ->
printfn $"Parameter {pInfo[0].Name} for method {mInfo.Name} has the ParamArray attribute."
// Check for the Description attribute.
| :? DescriptionAttribute as attr ->
printfn $"Parameter {pInfo[0].Name} for method {mInfo.Name} has a description attribute."
printfn $"The description is: \"{attr.Description}\""
| _ -> ()
// Output:
// Parameter args for method ParamArrayAndDesc has a description attribute.
// The description is: "This argument is a ParamArray"
// Parameter args for method ParamArrayAndDesc has the ParamArray attribute.
Imports System.Reflection
Imports System.ComponentModel
Module DemoModule
Public Class AClass
' Add Description and ParamArray (with the keyword) attributes.
Public Sub ParamArrayAndDesc( _
<Description("This argument is a ParamArray")> _
ByVal ParamArray args() As Integer)
End Sub
End Class
Sub Main()
' Get the Class type to access its metadata.
Dim clsType As Type = GetType(AClass)
' Get the type information for the method.
Dim mInfo As MethodInfo = clsType.GetMethod("ParamArrayAndDesc")
' Get the Parameter information for the method.
Dim pInfo() As ParameterInfo = mInfo.GetParameters()
Dim attr As Attribute
' Iterate through each attribute of the parameter.
For Each attr In Attribute.GetCustomAttributes(pInfo(0))
' Check for the ParamArray attribute.
If TypeOf attr Is ParamArrayAttribute Then
' Convert the attribute to access its data.
Dim paAttr As ParamArrayAttribute = _
CType(attr, ParamArrayAttribute)
Console.WriteLine("Parameter {0} for method {1} has the " + _
"ParamArray attribute.", pInfo(0).Name, mInfo.Name)
' Check for the Description attribute.
ElseIf TypeOf attr Is DescriptionAttribute Then
' Convert the attribute to access its data.
Dim descAttr As DescriptionAttribute = _
CType(attr, DescriptionAttribute)
Console.WriteLine("Parameter {0} for method {1} has a description " + _
"attribute. The description is:", pInfo(0).Name, mInfo.Name)
Console.WriteLine(descAttr.Description)
End If
Next
End Sub
End Module
' Output:
' Parameter args for method ParamArrayAndDesc has the ParamArray attribute.
' Parameter args for method ParamArrayAndDesc has a description attribute. The description is:
' This argument is a ParamArray
Commenti
Se element rappresenta un parametro in un metodo di un tipo derivato, il valore restituito include gli attributi personalizzati ereditabili applicati allo stesso parametro nei metodi di base sottoposti a override.
Si applica a
GetCustomAttributes(Module)
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
Recupera una matrice degli attributi personalizzati applicati a un modulo. Un parametro specifica il modulo.
public:
static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::Module ^ element);public static Attribute[] GetCustomAttributes (System.Reflection.Module element);static member GetCustomAttributes : System.Reflection.Module -> Attribute[]Public Shared Function GetCustomAttributes (element As Module) As Attribute()Parametri
Restituisce
Matrice Attribute che contiene gli attributi personalizzati applicati a elemento una matrice vuota se tali attributi personalizzati non esistono.
Eccezioni
element è null.
Esempio
Nell'esempio di codice seguente viene illustrato l'uso di GetCustomAttributes, accettando un Module come parametro.
using namespace System;
using namespace System::Reflection;
using namespace System::ComponentModel;
// Assign some attributes to the module.
// Set the module's CLSCompliant attribute to false
// The CLSCompliant attribute is applicable for /target:module.
[module:Description("A sample description")];
[module:CLSCompliant(false)];
namespace CustAttrs2CS
{
ref class DemoClass
{
public:
static void Main()
{
Type^ clsType = DemoClass::typeid;
// Get the Module type to access its metadata.
Module^ module = clsType->Module;
// Iterate through all the attributes for the module.
System::Collections::IEnumerator^ myEnum1 = Attribute::GetCustomAttributes( module )->GetEnumerator();
while ( myEnum1->MoveNext() )
{
Attribute^ attr = safe_cast<Attribute^>(myEnum1->Current);
// Check for the Description attribute.
if ( attr->GetType() == DescriptionAttribute::typeid )
Console::WriteLine( "Module {0} has the description \"{1}\".", module->Name, (dynamic_cast<DescriptionAttribute^>(attr))->Description );
// Check for the CLSCompliant attribute.
else
// Check for the CLSCompliant attribute.
if ( attr->GetType() == CLSCompliantAttribute::typeid )
Console::WriteLine( "Module {0} {1} CLSCompliant.", module->Name, (dynamic_cast<CLSCompliantAttribute^>(attr))->IsCompliant ? (String^)"is" : "is not" );
}
}
};
}
/*
* Output:
* Module CustAttrs2CS.exe is not CLSCompliant.
* Module CustAttrs2CS.exe has the description "A sample description".
*/
using System;
using System.Reflection;
using System.ComponentModel;
// Assign some attributes to the module.
[module:Description("A sample description")]
// Set the module's CLSCompliant attribute to false
// The CLSCompliant attribute is applicable for /target:module.
[module:CLSCompliant(false)]
namespace CustAttrs2CS {
class DemoClass {
static void Main(string[] args) {
Type clsType = typeof(DemoClass);
// Get the Module type to access its metadata.
Module module = clsType.Module;
// Iterate through all the attributes for the module.
foreach(Attribute attr in Attribute.GetCustomAttributes(module)) {
// Check for the Description attribute.
if (attr.GetType() == typeof(DescriptionAttribute))
Console.WriteLine("Module {0} has the description " +
"\"{1}\".", module.Name,
((DescriptionAttribute)attr).Description);
// Check for the CLSCompliant attribute.
else if (attr.GetType() == typeof(CLSCompliantAttribute))
Console.WriteLine("Module {0} {1} CLSCompliant.",
module.Name,
((CLSCompliantAttribute)attr).IsCompliant ?
"is" : "is not");
}
}
}
}
/*
* Output:
* Module CustAttrs2CS.exe is not CLSCompliant.
* Module CustAttrs2CS.exe has the description "A sample description".
*/
open System
open System.ComponentModel
// Assign some attributes to the module.
[<``module``: Description "A sample description">]
// Set the module's CLSCompliant attribute to false
// The CLSCompliant attribute is applicable for /target:module.
[<``module``: CLSCompliant false>]
do ()
type DemoClass = class end
// Get the Module type to access its metadata.
let ilmodule = typeof<DemoClass>.Module
// Iterate through all the attributes for the module.
for attr in Attribute.GetCustomAttributes ilmodule do
match attr with
// Check for the Description attribute.
| :? DescriptionAttribute as attr ->
printfn $"Module {ilmodule.Name} has the description \"{attr.Description}\"."
// Check for the CLSCompliant attribute.
| :? CLSCompliantAttribute as attr ->
printfn $"""Module {ilmodule.Name} {if attr.IsCompliant then "is" else "is not"} CLSCompliant."""
| _ -> ()
// Output:
// Module CustAttrs2CS.exe is not CLSCompliant.
// Module CustAttrs2CS.exe has the description "A sample description".
Imports System.Reflection
Imports System.ComponentModel
' Give the Module some attributes.
<Module: Description("A sample description")>
' Make the CLSCompliant attribute False.
' The CLSCompliant attribute is applicable for /target:module.
<Module: CLSCompliant(False)>
Module DemoModule
Sub Main()
' Get the Module type to access its metadata.
Dim modType As Reflection.Module = GetType(DemoModule).Module
Dim attr As Attribute
' Iterate through all the attributes for the module.
For Each attr In Attribute.GetCustomAttributes(modType)
' Check for the Description attribute.
If TypeOf attr Is DescriptionAttribute Then
' Convert the attribute to access its data.
Dim descAttr As DescriptionAttribute = _
CType(attr, DescriptionAttribute)
Console.WriteLine("Module {0} has the description ""{1}"".", _
modType.Name, descAttr.Description)
' Check for the CLSCompliant attribute.
ElseIf TypeOf attr Is CLSCompliantAttribute Then
' Convert the attribute to access its data.
Dim CLSCompAttr As CLSCompliantAttribute = _
CType(attr, CLSCompliantAttribute)
Dim strCompliant As String
If CLSCompAttr.IsCompliant Then
strCompliant = "is"
Else
strCompliant = "is not"
End If
Console.WriteLine("Module {0} {1} CLSCompliant.", _
modType.Name, strCompliant)
End If
Next
End Sub
End Module
' Output:
' Module CustAttrs2VB.exe has the description "A sample description".
' Module CustAttrs2VB.exe is not CLSCompliant.
Si applica a
GetCustomAttributes(MemberInfo)
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
Recupera una matrice degli attributi personalizzati applicati a un membro di un tipo. Un parametro specifica il membro.
public:
static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::MemberInfo ^ element);public static Attribute[] GetCustomAttributes (System.Reflection.MemberInfo element);static member GetCustomAttributes : System.Reflection.MemberInfo -> Attribute[]Public Shared Function GetCustomAttributes (element As MemberInfo) As Attribute()Parametri
- element
- MemberInfo
Oggetto derivato dalla classe MemberInfo che descrive un costruttore, un evento, un campo, un metodo o un membro della proprietà di una classe.
Restituisce
Matrice Attribute che contiene gli attributi personalizzati applicati a elemento una matrice vuota se tali attributi personalizzati non esistono.
Eccezioni
element è null.
element non è un costruttore, un metodo, una proprietà, un evento, un tipo o un campo.
Non è possibile caricare un tipo di attributo personalizzato.
Esempio
Nell'esempio di codice seguente viene illustrato l'uso di GetCustomAttribute, accettando un MemberInfo come parametro.
using namespace System;
using namespace System::Reflection;
using namespace System::Security;
using namespace System::Runtime::InteropServices;
namespace CustAttrs4CS
{
// Create a class for Win32 imported unmanaged functions.
public ref class Win32
{
public:
[DllImport("user32.dll", CharSet = CharSet::Unicode)]
static int MessageBox( int hWnd, String^ text, String^ caption, UInt32 type );
};
public ref class AClass
{
public:
// Add some attributes to the Win32CallMethod.
[Obsolete("This method is obsolete. Use managed MsgBox instead.")]
void Win32CallMethod()
{
Win32::MessageBox( 0, "This is an unmanaged call.", "Be Careful!", 0 );
}
};
ref class DemoClass
{
public:
static void Main()
{
// Get the Class type to access its metadata.
Type^ clsType = AClass::typeid;
// Get the type information for the Win32CallMethod.
MethodInfo^ mInfo = clsType->GetMethod( "Win32CallMethod" );
if ( mInfo != nullptr )
{
// Iterate through all the attributes for the method.
System::Collections::IEnumerator^ myEnum3 = Attribute::GetCustomAttributes( mInfo )->GetEnumerator();
while ( myEnum3->MoveNext() )
{
Attribute^ attr = safe_cast<Attribute^>(myEnum3->Current);
// Check for the Obsolete attribute.
if ( attr->GetType() == ObsoleteAttribute::typeid )
{
Console::WriteLine( "Method {0} is obsolete. "
"The message is:", mInfo->Name );
Console::WriteLine( (dynamic_cast<ObsoleteAttribute^>(attr))->Message );
}
// Check for the SuppressUnmanagedCodeSecurity attribute.
else
// Check for the SuppressUnmanagedCodeSecurity attribute.
if ( attr->GetType() == SuppressUnmanagedCodeSecurityAttribute::typeid )
{
Console::WriteLine( "This method calls unmanaged code "
"with no security check." );
Console::WriteLine( "Please do not use unless absolutely necessary." );
AClass^ myCls = gcnew AClass;
myCls->Win32CallMethod();
}
}
}
}
};
}
/*
* Output:
* Method Win32CallMethod is obsolete. The message is:
* This method is obsolete. Use managed MsgBox instead.
* This method calls unmanaged code with no security check.
* Please do not use unless absolutely necessary.
*/
using System;
using System.Reflection;
using System.Security;
using System.Runtime.InteropServices;
namespace CustAttrs4CS
{
// Define an enumeration of Win32 unmanaged types
public enum UnmanagedType
{
User,
GDI,
Kernel,
Shell,
Networking,
Multimedia
}
// Define the Unmanaged attribute.
public class UnmanagedAttribute : Attribute
{
// Storage for the UnmanagedType value.
protected UnmanagedType thisType;
// Set the unmanaged type in the constructor.
public UnmanagedAttribute(UnmanagedType type)
{
thisType = type;
}
// Define a property to get and set the UnmanagedType value.
public UnmanagedType Win32Type
{
get { return thisType; }
set { thisType = Win32Type; }
}
}
// Create a class for an imported Win32 unmanaged function.
public class Win32 {
[DllImport("user32.dll", CharSet = CharSet.Unicode)]
public static extern int MessageBox(int hWnd, String text,
String caption, uint type);
}
public class AClass {
// Add some attributes to Win32CallMethod.
[Obsolete("This method is obsolete. Use managed MsgBox instead.")]
[Unmanaged(UnmanagedType.User)]
public void Win32CallMethod()
{
Win32.MessageBox(0, "This is an unmanaged call.", "Caution!", 0);
}
}
class DemoClass {
static void Main(string[] args)
{
// Get the AClass type to access its metadata.
Type clsType = typeof(AClass);
// Get the type information for Win32CallMethod.
MethodInfo mInfo = clsType.GetMethod("Win32CallMethod");
if (mInfo != null)
{
// Iterate through all the attributes of the method.
foreach(Attribute attr in
Attribute.GetCustomAttributes(mInfo)) {
// Check for the Obsolete attribute.
if (attr.GetType() == typeof(ObsoleteAttribute))
{
Console.WriteLine("Method {0} is obsolete. " +
"The message is:",
mInfo.Name);
Console.WriteLine(" \"{0}\"",
((ObsoleteAttribute)attr).Message);
}
// Check for the Unmanaged attribute.
else if (attr.GetType() == typeof(UnmanagedAttribute))
{
Console.WriteLine(
"This method calls unmanaged code.");
Console.WriteLine(
String.Format("The Unmanaged attribute type is {0}.",
((UnmanagedAttribute)attr).Win32Type));
AClass myCls = new AClass();
myCls.Win32CallMethod();
}
}
}
}
}
}
/*
This code example produces the following results.
First, the compilation yields the warning, "... This method is
obsolete. Use managed MsgBox instead."
Second, execution yields a message box with a title of "Caution!"
and message text of "This is an unmanaged call."
Third, the following text is displayed in the console window:
Method Win32CallMethod is obsolete. The message is:
"This method is obsolete. Use managed MsgBox instead."
This method calls unmanaged code.
The Unmanaged attribute type is User.
*/
open System
open System.Runtime.InteropServices
// Define an enumeration of Win32 unmanaged types
type UnmanagedType =
| User = 0
| GDI = 1
| Kernel = 2
| Shell = 3
| Networking = 4
| Multimedia = 5
// Define the Unmanaged attribute.
type UnmanagedAttribute(unmanagedType) =
inherit Attribute()
// Define a property to get and set the UnmanagedType value.
member val Win32Type = unmanagedType with get, set
// Create a module for an imported Win32 unmanaged function.
module Win32 =
[<DllImport("user32.dll", CharSet = CharSet.Unicode)>]
extern int MessageBox(IntPtr hWnd, String text, String caption, uint ``type``)
type AClass() =
// Add some attributes to Win32CallMethod.
[<Obsolete "This method is obsolete. Use managed MsgBox instead.">]
[<Unmanaged(UnmanagedType.User)>]
member _.Win32CallMethod () =
Win32.MessageBox(0, "This is an unmanaged call.", "Caution!", 0u)
// Get the AClass type to access its metadata.
let clsType = typeof<AClass>
// Get the type information for Win32CallMethod.
let mInfo = clsType.GetMethod "Win32CallMethod"
if mInfo <> null then
// Iterate through all the attributes of the method.
for attr in Attribute.GetCustomAttributes mInfo do
match attr with
// Check for the Obsolete attribute.
| :? ObsoleteAttribute as attr ->
printfn $"Method {mInfo.Name} is obsolete. The message is:"
printfn $" \"{attr.Message}\""
// Check for the Unmanaged attribute.
| :? UnmanagedAttribute as attr ->
printfn "This method calls unmanaged code."
printfn $"The Unmanaged attribute type is {attr.Win32Type}."
let myCls = AClass()
myCls.Win32CallMethod() |> ignore
| _ -> ()
// This code example produces the following results.
//
// First, the compilation yields the warning, "... This method is
// obsolete. Use managed MsgBox instead."
// Second, execution yields a message box with a title of "Caution!"
// and message text of "This is an unmanaged call."
// Third, the following text is displayed in the console window:
// Method Win32CallMethod is obsolete. The message is:
// "This method is obsolete. Use managed MsgBox instead."
// This method calls unmanaged code.
// The Unmanaged attribute type is User.
Imports System.Reflection
Imports System.Security
Imports System.Runtime.InteropServices
' Define an enumeration of Win32 unmanaged types
Public Enum UnmanagedType
User
GDI
Kernel
Shell
Networking
Multimedia
End Enum 'UnmanagedType
' Define the Unmanaged attribute.
Public Class UnmanagedAttribute
Inherits Attribute
' Storage for the UnmanagedType value.
Protected thisType As UnmanagedType
' Set the unmanaged type in the constructor.
Public Sub New(ByVal type As UnmanagedType)
thisType = type
End Sub
' Define a property to get and set the UnmanagedType value.
Public Property Win32Type() As UnmanagedType
Get
Return thisType
End Get
Set
thisType = Win32Type
End Set
End Property
End Class
' Create a class for an imported Win32 unmanaged function.
Public Class Win32
<DllImport("user32.dll", CharSet:=CharSet.Unicode)> _
Public Shared Function MessageBox(ByVal hWnd As Integer, _
ByVal Text As String, _
ByVal caption As String, _
ByVal type As Integer) As Integer
End Function 'MessageBox
End Class
Public Class AClass
' Add some attributes to Win32CallMethod.
<Obsolete("This method is obsolete. Use managed MsgBox instead."), _
Unmanaged(UnmanagedType.User)> _
Public Sub Win32CallMethod()
Win32.MessageBox(0, "This is an unmanaged call.", "Caution!", 0)
End Sub
End Class
Class DemoClass
Shared Sub Main(ByVal args() As String)
' Get the AClass type to access its metadata.
Dim clsType As Type = GetType(AClass)
' Get the type information for Win32CallMethod.
Dim mInfo As MethodInfo = clsType.GetMethod("Win32CallMethod")
If Not (mInfo Is Nothing) Then
' Iterate through all the attributes of the method.
Dim attr As Attribute
For Each attr In Attribute.GetCustomAttributes(mInfo)
' Check for the Obsolete attribute.
If attr.GetType().Equals(GetType(ObsoleteAttribute)) Then
Console.WriteLine("Method {0} is obsolete. The message is:", mInfo.Name)
Console.WriteLine(" ""{0}""", CType(attr, ObsoleteAttribute).Message)
' Check for the Unmanaged attribute.
ElseIf attr.GetType().Equals(GetType(UnmanagedAttribute)) Then
Console.WriteLine("This method calls unmanaged code.")
Console.WriteLine( _
String.Format("The Unmanaged attribute type is {0}.", _
CType(attr, UnmanagedAttribute).Win32Type))
Dim myCls As New AClass()
myCls.Win32CallMethod()
End If
Next attr
End If
End Sub
End Class
'
'This code example produces the following results.
'
'First, the compilation yields the warning, "... This method is
'obsolete. Use managed MsgBox instead."
'Second, execution yields a message box with a title of "Caution!"
'and message text of "This is an unmanaged call."
'Third, the following text is displayed in the console window:
'
'Method Win32CallMethod is obsolete. The message is:
' "This method is obsolete. Use managed MsgBox instead."
'This method calls unmanaged code.
'The Unmanaged attribute type is User.
'
Commenti
Il valore restituito contiene gli attributi personalizzati per i predecessori di element.
Nota
A partire da .NET Framework versione 2.0, questo metodo restituisce attributi di sicurezza per metodi, costruttori e tipi se gli attributi vengono archiviati nel nuovo formato di metadati. Gli assembly compilati con la versione 2.0 o successiva usano il nuovo formato. Gli assembly dinamici e gli assembly compilati con le versioni precedenti di .NET Framework usano il formato XML precedente. Vedere creazione di attributi di sicurezza dichiarativi.
Si applica a
GetCustomAttributes(Assembly)
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
Recupera una matrice degli attributi personalizzati applicati a un assembly. Un parametro specifica l'assembly.
public:
static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::Assembly ^ element);public static Attribute[] GetCustomAttributes (System.Reflection.Assembly element);static member GetCustomAttributes : System.Reflection.Assembly -> Attribute[]Public Shared Function GetCustomAttributes (element As Assembly) As Attribute()Parametri
- element
- Assembly
Oggetto derivato dalla classe Assembly che descrive una raccolta riutilizzabile di moduli.
Restituisce
Matrice Attribute che contiene gli attributi personalizzati applicati a elemento una matrice vuota se tali attributi personalizzati non esistono.
Eccezioni
element è null.
Esempio
Nell'esempio seguente vengono recuperati gli attributi personalizzati trovati nell'assembly corrente.
using namespace System;
using namespace System::Reflection;
[assembly:AssemblyTitle("CustAttrs1CPP")];
[assembly:AssemblyDescription("GetCustomAttributes() Demo")];
[assembly:AssemblyCompany("Microsoft")];
ref class Example
{};
static void main()
{
Type^ clsType = Example::typeid;
// Get the Assembly type to access its metadata.
Assembly^ assy = clsType->Assembly;
// Iterate through the attributes for the assembly.
System::Collections::IEnumerator^ myEnum = Attribute::GetCustomAttributes( assy )->GetEnumerator();
while ( myEnum->MoveNext() )
{
Attribute^ attr = safe_cast<Attribute^>(myEnum->Current);
// Check for the AssemblyTitle attribute.
if ( attr->GetType() == AssemblyTitleAttribute::typeid )
Console::WriteLine( "Assembly title is \"{0}\".", (dynamic_cast<AssemblyTitleAttribute^>(attr))->Title );
// Check for the AssemblyDescription attribute.
else
// Check for the AssemblyDescription attribute.
if ( attr->GetType() == AssemblyDescriptionAttribute::typeid )
Console::WriteLine( "Assembly description is \"{0}\".", (dynamic_cast<AssemblyDescriptionAttribute^>(attr))->Description );
// Check for the AssemblyCompany attribute.
else if ( attr->GetType() == AssemblyCompanyAttribute::typeid )
Console::WriteLine( "Assembly company is {0}.", (dynamic_cast<AssemblyCompanyAttribute^>(attr))->Company );
}
}
// The example displays the following output:
// Assembly description is "GetCustomAttributes() Demo".
// Assembly company is Microsoft.
// Assembly title is "CustAttrs1CPP".
using System;
using System.Reflection;
[assembly: AssemblyTitle("CustAttrs1CS")]
[assembly: AssemblyDescription("GetCustomAttributes() Demo")]
[assembly: AssemblyCompany("Microsoft")]
class Example {
static void Main() {
// Get the Assembly object to access its metadata.
Assembly assy = typeof(Example).Assembly;
// Iterate through the attributes for the assembly.
foreach(Attribute attr in Attribute.GetCustomAttributes(assy)) {
// Check for the AssemblyTitle attribute.
if (attr.GetType() == typeof(AssemblyTitleAttribute))
Console.WriteLine("Assembly title is \"{0}\".",
((AssemblyTitleAttribute)attr).Title);
// Check for the AssemblyDescription attribute.
else if (attr.GetType() ==
typeof(AssemblyDescriptionAttribute))
Console.WriteLine("Assembly description is \"{0}\".",
((AssemblyDescriptionAttribute)attr).Description);
// Check for the AssemblyCompany attribute.
else if (attr.GetType() == typeof(AssemblyCompanyAttribute))
Console.WriteLine("Assembly company is {0}.",
((AssemblyCompanyAttribute)attr).Company);
}
}
}
// The example displays the following output:
// Assembly title is "CustAttrs1CS".
// Assembly description is "GetCustomAttributes() Demo".
// Assembly company is Microsoft.
open System
open System.Reflection
[<assembly: AssemblyTitle "CustAttrs1CS">]
[<assembly: AssemblyDescription "GetCustomAttributes() Demo">]
[<assembly: AssemblyCompany"Microsoft">]
do ()
type Example = class end
// Get the Assembly object to access its metadata.
let assembly = typeof<Example>.Assembly
// Iterate through the attributes for the assembly.
for attr in Attribute.GetCustomAttributes assembly do
match attr with
// Check for the AssemblyTitle attribute.
| :? AssemblyTitleAttribute as attr ->
printfn $"Assembly title is \"{attr.Title}\"."
// Check for the AssemblyDescription attribute.
| :? AssemblyDescriptionAttribute as attr ->
printfn $"Assembly description is \"{attr.Description}\"."
// Check for the AssemblyCompany attribute.
| :? AssemblyCompanyAttribute as attr ->
printfn $"Assembly company is {attr.Company}."
| _ -> ()
// The example displays the following output:
// Assembly title is "CustAttrs1CS".
// Assembly description is "GetCustomAttributes() Demo".
// Assembly company is Microsoft.
Imports System.Reflection
<Assembly: AssemblyTitle("CustAttrs1VB")>
<Assembly: AssemblyDescription("GetCustomAttributes() Demo")>
<Assembly: AssemblyCompany("Microsoft")>
Module Example
Sub Main()
' Get the Assembly type to access its metadata.
Dim assy As Reflection.Assembly = GetType(Example).Assembly
' Iterate through all the attributes for the assembly.
For Each attr As Attribute In Attribute.GetCustomAttributes(assy)
' Check for the AssemblyTitle attribute.
If TypeOf attr Is AssemblyTitleAttribute Then
' Convert the attribute to access its data.
Dim attrTitle As AssemblyTitleAttribute = _
CType(attr, AssemblyTitleAttribute)
Console.WriteLine("Assembly title is ""{0}"".", _
attrTitle.Title)
' Check for the AssemblyDescription attribute.
ElseIf TypeOf attr Is AssemblyDescriptionAttribute Then
' Convert the attribute to access its data.
Dim attrDesc As AssemblyDescriptionAttribute = _
CType(attr, AssemblyDescriptionAttribute)
Console.WriteLine("Assembly description is ""{0}"".", _
attrDesc.Description)
' Check for the AssemblyCompany attribute.
ElseIf TypeOf attr Is AssemblyCompanyAttribute Then
' Convert the attribute to access its data.
Dim attrComp As AssemblyCompanyAttribute = _
CType(attr, AssemblyCompanyAttribute)
Console.WriteLine("Assembly company is {0}.", _
attrComp.Company)
End If
Next
End Sub
End Module
' The example displays the following output:
' Assembly company is Microsoft.
' Assembly description is "GetCustomAttributes() Demo".
' Assembly title is "CustAttrs1VB".
Commenti
Nota
A partire da .NET Framework versione 2.0, questo metodo restituisce gli attributi di sicurezza se gli attributi vengono archiviati nel nuovo formato di metadati. Gli assembly compilati con la versione 2.0 o successiva usano il nuovo formato. Gli assembly dinamici e gli assembly compilati con le versioni precedenti di .NET Framework usano il formato XML precedente. Vedere creazione di attributi di sicurezza dichiarativi.
Si applica a
GetCustomAttributes(Module, Boolean)
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
- Origine:
- Attribute.CoreCLR.cs
Recupera una matrice degli attributi personalizzati applicati a un modulo. I parametri specificano il modulo e un'opzione di ricerca ignorata.
public:
static cli::array <Attribute ^> ^ GetCustomAttributes(System::Reflection::Module ^ element, bool inherit);public static Attribute[] GetCustomAttributes (System.Reflection.Module element, bool inherit);static member GetCustomAttributes : System.Reflection.Module * bool -> Attribute[]Public Shared Function GetCustomAttributes (element As Module, inherit As Boolean) As Attribute()Parametri
- inherit
- Boolean
Questo parametro viene ignorato e non influisce sull'operazione di questo metodo.
Restituisce
Matrice Attribute che contiene gli attributi personalizzati applicati a elemento una matrice vuota se tali attributi personalizzati non esistono.
Eccezioni
element è null.
Esempio
Nell'esempio di codice seguente viene illustrato l'uso di GetCustomAttributes, accettando un Module come parametro.
using namespace System;
using namespace System::Reflection;
using namespace System::ComponentModel;
// Assign some attributes to the module.
// Set the module's CLSCompliant attribute to false
// The CLSCompliant attribute is applicable for /target:module.
[module:Description("A sample description")];
[module:CLSCompliant(false)];
namespace CustAttrs2CS
{
ref class DemoClass
{
public:
static void Main()
{
Type^ clsType = DemoClass::typeid;
// Get the Module type to access its metadata.
Module^ module = clsType->Module;
// Iterate through all the attributes for the module.
System::Collections::IEnumerator^ myEnum1 = Attribute::GetCustomAttributes( module )->GetEnumerator();
while ( myEnum1->MoveNext() )
{
Attribute^ attr = safe_cast<Attribute^>(myEnum1->Current);
// Check for the Description attribute.
if ( attr->GetType() == DescriptionAttribute::typeid )
Console::WriteLine( "Module {0} has the description \"{1}\".", module->Name, (dynamic_cast<DescriptionAttribute^>(attr))->Description );
// Check for the CLSCompliant attribute.
else
// Check for the CLSCompliant attribute.
if ( attr->GetType() == CLSCompliantAttribute::typeid )
Console::WriteLine( "Module {0} {1} CLSCompliant.", module->Name, (dynamic_cast<CLSCompliantAttribute^>(attr))->IsCompliant ? (String^)"is" : "is not" );
}
}
};
}
/*
* Output:
* Module CustAttrs2CS.exe is not CLSCompliant.
* Module CustAttrs2CS.exe has the description "A sample description".
*/
using System;
using System.Reflection;
using System.ComponentModel;
// Assign some attributes to the module.
[module:Description("A sample description")]
// Set the module's CLSCompliant attribute to false
// The CLSCompliant attribute is applicable for /target:module.
[module:CLSCompliant(false)]
namespace CustAttrs2CS {
class DemoClass {
static void Main(string[] args) {
Type clsType = typeof(DemoClass);
// Get the Module type to access its metadata.
Module module = clsType.Module;
// Iterate through all the attributes for the module.
foreach(Attribute attr in Attribute.GetCustomAttributes(module)) {
// Check for the Description attribute.
if (attr.GetType() == typeof(DescriptionAttribute))
Console.WriteLine("Module {0} has the description " +
"\"{1}\".", module.Name,
((DescriptionAttribute)attr).Description);
// Check for the CLSCompliant attribute.
else if (attr.GetType() == typeof(CLSCompliantAttribute))
Console.WriteLine("Module {0} {1} CLSCompliant.",
module.Name,
((CLSCompliantAttribute)attr).IsCompliant ?
"is" : "is not");
}
}
}
}
/*
* Output:
* Module CustAttrs2CS.exe is not CLSCompliant.
* Module CustAttrs2CS.exe has the description "A sample description".
*/
open System
open System.ComponentModel
// Assign some attributes to the module.
[<``module``: Description "A sample description">]
// Set the module's CLSCompliant attribute to false
// The CLSCompliant attribute is applicable for /target:module.
[<``module``: CLSCompliant false>]
do ()
type DemoClass = class end
// Get the Module type to access its metadata.
let ilmodule = typeof<DemoClass>.Module
// Iterate through all the attributes for the module.
for attr in Attribute.GetCustomAttributes ilmodule do
match attr with
// Check for the Description attribute.
| :? DescriptionAttribute as attr ->
printfn $"Module {ilmodule.Name} has the description \"{attr.Description}\"."
// Check for the CLSCompliant attribute.
| :? CLSCompliantAttribute as attr ->
printfn $"""Module {ilmodule.Name} {if attr.IsCompliant then "is" else "is not"} CLSCompliant."""
| _ -> ()
// Output:
// Module CustAttrs2CS.exe is not CLSCompliant.
// Module CustAttrs2CS.exe has the description "A sample description".
Imports System.Reflection
Imports System.ComponentModel
' Give the Module some attributes.
<Module: Description("A sample description")>
' Make the CLSCompliant attribute False.
' The CLSCompliant attribute is applicable for /target:module.
<Module: CLSCompliant(False)>
Module DemoModule
Sub Main()
' Get the Module type to access its metadata.
Dim modType As Reflection.Module = GetType(DemoModule).Module
Dim attr As Attribute
' Iterate through all the attributes for the module.
For Each attr In Attribute.GetCustomAttributes(modType)
' Check for the Description attribute.
If TypeOf attr Is DescriptionAttribute Then
' Convert the attribute to access its data.
Dim descAttr As DescriptionAttribute = _
CType(attr, DescriptionAttribute)
Console.WriteLine("Module {0} has the description ""{1}"".", _
modType.Name, descAttr.Description)
' Check for the CLSCompliant attribute.
ElseIf TypeOf attr Is CLSCompliantAttribute Then
' Convert the attribute to access its data.
Dim CLSCompAttr As CLSCompliantAttribute = _
CType(attr, CLSCompliantAttribute)
Dim strCompliant As String
If CLSCompAttr.IsCompliant Then
strCompliant = "is"
Else
strCompliant = "is not"
End If
Console.WriteLine("Module {0} {1} CLSCompliant.", _
modType.Name, strCompliant)
End If
Next
End Sub
End Module
' Output:
' Module CustAttrs2VB.exe has the description "A sample description".
' Module CustAttrs2VB.exe is not CLSCompliant.
Commenti
Il valore restituito contiene gli attributi personalizzati per i predecessori di element se inherit è true.
Si applica a
Collabora con noi su GitHub
L'origine di questo contenuto è disponibile in GitHub, in cui è anche possibile creare ed esaminare i problemi e le richieste pull. Per ulteriori informazioni, vedere la guida per i collaboratori.
