FieldBuilder.SetCustomAttribute Método
Definição
Importante
Algumas informações se referem a produtos de pré-lançamento que podem ser substancialmente modificados antes do lançamento. A Microsoft não oferece garantias, expressas ou implícitas, das informações aqui fornecidas.
Define um atributo personalizado.
Sobrecargas
| SetCustomAttribute(CustomAttributeBuilder) |
Define um atributo personalizado usando um construtor de atributos personalizados. |
| SetCustomAttribute(ConstructorInfo, Byte[]) |
Define um atributo personalizado usando um blob de atributo personalizado especificado. |
SetCustomAttribute(CustomAttributeBuilder)
- Origem:
- FieldBuilder.cs
- Origem:
- FieldBuilder.cs
- Origem:
- FieldBuilder.cs
Define um atributo personalizado usando um construtor de atributos personalizados.
public:
void SetCustomAttribute(System::Reflection::Emit::CustomAttributeBuilder ^ customBuilder);public void SetCustomAttribute (System.Reflection.Emit.CustomAttributeBuilder customBuilder);member this.SetCustomAttribute : System.Reflection.Emit.CustomAttributeBuilder -> unitPublic Sub SetCustomAttribute (customBuilder As CustomAttributeBuilder)Parâmetros
- customBuilder
- CustomAttributeBuilder
Uma instância de uma classe auxiliar para definir o atributo personalizado.
Exceções
con é null.
O tipo pai desse campo é concluído.
Exemplos
O exemplo de código a seguir ilustra o uso de SetCustomAttribute no contexto de FieldBuilder, usando um CustomAttributeBuilder.
using namespace System;
using namespace System::Threading;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
[AttributeUsage(AttributeTargets::All,AllowMultiple=false)]
public ref class MyAttribute1: public Attribute
{
public:
String^ myCustomAttributeValue;
MyAttribute1( String^ myString )
{
myCustomAttributeValue = myString;
}
};
[AttributeUsage(AttributeTargets::All,AllowMultiple=false)]
public ref class MyAttribute2: public Attribute
{
public:
bool myCustomAttributeValue;
MyAttribute2( bool myBool )
{
myCustomAttributeValue = myBool;
}
};
Type^ CreateCallee( AppDomain^ currentDomain )
{
// Create a simple name for the assembly.
AssemblyName^ myAssemblyName = gcnew AssemblyName;
myAssemblyName->Name = "EmittedAssembly";
// Create the called dynamic assembly.
AssemblyBuilder^ myAssemblyBuilder = currentDomain->DefineDynamicAssembly( myAssemblyName, AssemblyBuilderAccess::RunAndSave );
ModuleBuilder^ myModuleBuilder = myAssemblyBuilder->DefineDynamicModule( "EmittedModule", "EmittedModule.mod" );
// Define a public class named 'CustomClass' in the assembly.
TypeBuilder^ myTypeBuilder = myModuleBuilder->DefineType( "CustomClass", TypeAttributes::Public );
// Define a private String field named 'MyField' in the type.
FieldBuilder^ myFieldBuilder = myTypeBuilder->DefineField( "MyField", String::typeid, FieldAttributes::Public );
Type^ myAttributeType1 = MyAttribute1::typeid;
// Create a Constructorinfo Object* for attribute 'MyAttribute1'.
array<Type^>^type1 = {String::typeid};
ConstructorInfo^ myConstructorInfo = myAttributeType1->GetConstructor( type1 );
// Create the CustomAttribute instance of attribute of type 'MyAttribute1'.
array<Object^>^obj1 = {"Test"};
CustomAttributeBuilder^ attributeBuilder = gcnew CustomAttributeBuilder( myConstructorInfo,obj1 );
// Set the CustomAttribute 'MyAttribute1' to the Field.
myFieldBuilder->SetCustomAttribute( attributeBuilder );
Type^ myAttributeType2 = MyAttribute2::typeid;
// Create a Constructorinfo Object* for attribute 'MyAttribute2'.
array<Type^>^type2 = {bool::typeid};
ConstructorInfo^ myConstructorInfo2 = myAttributeType2->GetConstructor( type2 );
// Set the CustomAttribute 'MyAttribute2' to the Field.
array<Byte>^bytes = {01,00,01,00,00};
myFieldBuilder->SetCustomAttribute( myConstructorInfo2, bytes );
// Create a method.
array<Type^>^type3 = {String::typeid,int::typeid};
MethodBuilder^ myMethodBuilder = myTypeBuilder->DefineMethod( "MyMethod", MethodAttributes::Public, nullptr, type3 );
ILGenerator^ myILGenerator = myMethodBuilder->GetILGenerator();
myILGenerator->Emit( OpCodes::Ldarg_0 );
myILGenerator->Emit( OpCodes::Ldarg_1 );
myILGenerator->Emit( OpCodes::Stfld, myFieldBuilder );
myILGenerator->EmitWriteLine( "Value of the Field is :" );
myILGenerator->EmitWriteLine( myFieldBuilder );
myILGenerator->Emit( OpCodes::Ret );
return myTypeBuilder->CreateType();
}
int main()
{
try
{
Type^ myCustomClass = CreateCallee( Thread::GetDomain() );
// Construct an instance of a type.
Object^ myObject = Activator::CreateInstance( myCustomClass );
Console::WriteLine( "FieldBuilder Sample" );
// Find a method in this type and call it on this Object*.
MethodInfo^ myMethodInfo = myCustomClass->GetMethod( "MyMethod" );
array<Object^>^obj1 = {"Sample string",3};
myMethodInfo->Invoke( myObject, obj1 );
// Retrieve the values of Attributes applied to field and display to console.
array<FieldInfo^>^myFieldInfo = myCustomClass->GetFields();
for ( int i = 0; i < myFieldInfo->Length; i++ )
{
array<Object^>^attributes = myFieldInfo[ i ]->GetCustomAttributes( true );
for ( int index = 0; index < attributes->Length; index++ )
{
if ( dynamic_cast<MyAttribute1^>(attributes[ index ]) )
{
MyAttribute1^ myCustomAttribute = safe_cast<MyAttribute1^>(attributes[ index ]);
Console::WriteLine( "Attribute Value of (MyAttribute1): {0}", myCustomAttribute->myCustomAttributeValue );
}
if ( dynamic_cast<MyAttribute2^>(attributes[ index ]) )
{
MyAttribute2^ myCustomAttribute = safe_cast<MyAttribute2^>(attributes[ index ]);
Console::WriteLine( "Attribute Value of (MyAttribute2): {0}", myCustomAttribute->myCustomAttributeValue );
}
}
}
}
catch ( Exception^ e )
{
Console::WriteLine( "Exception Caught {0}", e->Message );
}
}
using System;
using System.Threading;
using System.Reflection;
using System.Reflection.Emit;
namespace MySample
{
[AttributeUsage(AttributeTargets.All, AllowMultiple = false)]
public class MyAttribute1 :Attribute
{
public string myCustomAttributeValue;
public MyAttribute1(string myString)
{
myCustomAttributeValue = myString;
}
}
[AttributeUsage(AttributeTargets.All, AllowMultiple = false)]
public class MyAttribute2 :Attribute
{
public bool myCustomAttributeValue;
public MyAttribute2(bool myBool)
{
myCustomAttributeValue = myBool;
}
}
class FieldBuilder_Sample
{
private static Type CreateCallee(AppDomain currentDomain)
{
// Create a simple name for the assembly.
AssemblyName myAssemblyName = new AssemblyName();
myAssemblyName.Name = "EmittedAssembly";
// Create the called dynamic assembly.
AssemblyBuilder myAssemblyBuilder =
currentDomain.DefineDynamicAssembly(myAssemblyName, AssemblyBuilderAccess.RunAndSave);
ModuleBuilder myModuleBuilder =
myAssemblyBuilder.DefineDynamicModule("EmittedModule","EmittedModule.mod");
// Define a public class named 'CustomClass' in the assembly.
TypeBuilder myTypeBuilder = myModuleBuilder.DefineType("CustomClass",
TypeAttributes.Public);
// Define a private String field named 'MyField' in the type.
FieldBuilder myFieldBuilder =
myTypeBuilder.DefineField("MyField", typeof(String), FieldAttributes.Public);
Type myAttributeType1 = typeof(MyAttribute1);
// Create a Constructorinfo object for attribute 'MyAttribute1'.
ConstructorInfo myConstructorInfo = myAttributeType1.GetConstructor(
new Type[1]{typeof(string)});
// Create the CustomAttribute instance of attribute of type 'MyAttribute1'.
CustomAttributeBuilder attributeBuilder =
new CustomAttributeBuilder( myConstructorInfo,new object[1]{"Test"});
// Set the CustomAttribute 'MyAttribute1' to the Field.
myFieldBuilder.SetCustomAttribute(attributeBuilder);
Type myAttributeType2 = typeof(MyAttribute2);
// Create a Constructorinfo object for attribute 'MyAttribute2'.
ConstructorInfo myConstructorInfo2 = myAttributeType2.GetConstructor(
new Type[1]{typeof(bool)});
// Set the CustomAttribute 'MyAttribute2' to the Field.
myFieldBuilder.SetCustomAttribute(myConstructorInfo2,new byte[]{01,00,01,00,00});
// Create a method.
MethodBuilder myMethodBuilder= myTypeBuilder.DefineMethod("MyMethod",
MethodAttributes.Public,null,new Type[2]{typeof(string),typeof(int)});
ILGenerator myILGenerator = myMethodBuilder.GetILGenerator();
myILGenerator.Emit(OpCodes.Ldarg_0);
myILGenerator.Emit(OpCodes.Ldarg_1);
myILGenerator.Emit(OpCodes.Stfld, myFieldBuilder);
myILGenerator.EmitWriteLine("Value of the Field is :");
myILGenerator.EmitWriteLine(myFieldBuilder);
myILGenerator.Emit(OpCodes.Ret);
return myTypeBuilder.CreateType();
}
public static void Main()
{
try
{
Type myCustomClass = CreateCallee(Thread.GetDomain());
// Construct an instance of a type.
Object myObject = Activator.CreateInstance(myCustomClass);
Console.WriteLine( "FieldBuilder Sample");
// Find a method in this type and call it on this object.
MethodInfo myMethodInfo = myCustomClass.GetMethod("MyMethod");
myMethodInfo.Invoke(myObject, new object[2]{"Sample string",3});
// Retrieve the values of Attributes applied to field and display to console.
FieldInfo[] myFieldInfo = myCustomClass.GetFields();
for(int i =0;i<myFieldInfo.Length;i++)
{
object[] attributes = myFieldInfo[i].GetCustomAttributes(true);
for(int index=0; index < attributes.Length; index++)
{
if(attributes[index] is MyAttribute1)
{
MyAttribute1 myCustomAttribute = (MyAttribute1)attributes[index];
Console.WriteLine("Attribute Value of (MyAttribute1): "
+ myCustomAttribute.myCustomAttributeValue);
}
if(attributes[index] is MyAttribute2)
{
MyAttribute2 myCustomAttribute = (MyAttribute2)attributes[index];
Console.WriteLine("Attribute Value of (MyAttribute2): "
+ myCustomAttribute.myCustomAttributeValue);
}
}
}
}
catch (Exception e)
{
Console.WriteLine("Exception Caught "+e.Message);
}
}
}
}
Imports System.Threading
Imports System.Reflection
Imports System.Reflection.Emit
Namespace MySample
<AttributeUsage(AttributeTargets.All, AllowMultiple:=False)> Public Class MyAttribute1
Inherits Attribute
Public myCustomAttributeValue As String
Public Sub New(ByVal myString As String)
myCustomAttributeValue = myString
End Sub
End Class
<AttributeUsage(AttributeTargets.All, AllowMultiple:=False)> Public Class MyAttribute2
Inherits Attribute
Public myCustomAttributeValue As Boolean
Public Sub New(ByVal myBool As Boolean)
myCustomAttributeValue = myBool
End Sub
End Class
Class FieldBuilder_Sample
Private Shared Function CreateCallee(ByVal currentDomain As AppDomain) As Type
' Create a simple name for the assembly.
Dim myAssemblyName As New AssemblyName()
myAssemblyName.Name = "EmittedAssembly"
' Create the called dynamic assembly.
Dim myAssemblyBuilder As AssemblyBuilder = _
currentDomain.DefineDynamicAssembly(myAssemblyName, _
AssemblyBuilderAccess.RunAndSave)
Dim myModuleBuilder As ModuleBuilder = _
myAssemblyBuilder.DefineDynamicModule("EmittedModule", _
"EmittedModule.mod")
' Define a public class named 'CustomClass' in the assembly.
Dim myTypeBuilder As TypeBuilder = myModuleBuilder.DefineType("CustomClass", _
TypeAttributes.Public)
' Define a private String field named 'MyField' in the type.
Dim myFieldBuilder As FieldBuilder = myTypeBuilder.DefineField("MyField", _
GetType(String), FieldAttributes.Public)
Dim myAttributeType1 As Type = GetType(MyAttribute1)
' Create a Constructorinfo object for attribute 'MyAttribute1'.
Dim myConstructorInfo As ConstructorInfo = _
myAttributeType1.GetConstructor(New Type(0) {GetType(String)})
' Create the CustomAttribute instance of attribute of type 'MyAttribute1'.
Dim attributeBuilder As _
New CustomAttributeBuilder(myConstructorInfo, New Object(0) {"Test"})
' Set the CustomAttribute 'MyAttribute1' to the Field.
myFieldBuilder.SetCustomAttribute(attributeBuilder)
Dim myAttributeType2 As Type = GetType(MyAttribute2)
' Create a Constructorinfo object for attribute 'MyAttribute2'.
Dim myConstructorInfo2 As ConstructorInfo = _
myAttributeType2.GetConstructor(New Type(0) {GetType(Boolean)})
' Set the CustomAttribute 'MyAttribute2' to the Field.
myFieldBuilder.SetCustomAttribute(myConstructorInfo2, New Byte() {1, 0, 1, 0, 0})
' Create a method.
Dim myMethodBuilder As MethodBuilder = myTypeBuilder.DefineMethod("MyMethod", _
MethodAttributes.Public, Nothing, New Type(1) {GetType(String), GetType(Integer)})
Dim myILGenerator As ILGenerator = myMethodBuilder.GetILGenerator()
myILGenerator.Emit(OpCodes.Ldarg_0)
myILGenerator.Emit(OpCodes.Ldarg_1)
myILGenerator.Emit(OpCodes.Stfld, myFieldBuilder)
myILGenerator.EmitWriteLine("Value of the Field is :")
myILGenerator.EmitWriteLine(myFieldBuilder)
myILGenerator.Emit(OpCodes.Ret)
Return myTypeBuilder.CreateType()
End Function 'CreateCallee
Public Shared Sub Main()
Try
Dim myCustomClass As Type = CreateCallee(Thread.GetDomain())
' Construct an instance of a type.
Dim myObject As Object = Activator.CreateInstance(myCustomClass)
Console.WriteLine("FieldBuilder Sample")
' Find a method in this type and call it on this object.
Dim myMethodInfo As MethodInfo = myCustomClass.GetMethod("MyMethod")
myMethodInfo.Invoke(myObject, New Object(1) {"Sample string", 3})
' Retrieve the values of Attributes applied to field and display to console.
Dim myFieldInfo As FieldInfo() = myCustomClass.GetFields()
Dim i As Integer
For i = 0 To myFieldInfo.Length - 1
Dim attributes As Object() = myFieldInfo(i).GetCustomAttributes(True)
Dim index As Integer
For index = 0 To attributes.Length - 1
If TypeOf attributes(index) Is MyAttribute1 Then
Dim myCustomAttribute As MyAttribute1 = _
CType(attributes(index), MyAttribute1)
Console.WriteLine("Attribute Value of (MyAttribute1): " _
+ myCustomAttribute.myCustomAttributeValue.ToString())
End If
If TypeOf attributes(index) Is MyAttribute2 Then
Dim myCustomAttribute As MyAttribute2 = _
CType(attributes(index), MyAttribute2)
Console.WriteLine("Attribute Value of (MyAttribute2): " _
+ myCustomAttribute.myCustomAttributeValue.ToString())
End If
Next index
Next i
Catch e as Exception
Console.WriteLine("Exception Caught "+e.Message)
End Try
End Sub
End Class
End Namespace 'MySample
Aplica-se a
SetCustomAttribute(ConstructorInfo, Byte[])
- Origem:
- FieldBuilder.cs
- Origem:
- FieldBuilder.cs
- Origem:
- FieldBuilder.cs
Define um atributo personalizado usando um blob de atributo personalizado especificado.
public:
void SetCustomAttribute(System::Reflection::ConstructorInfo ^ con, cli::array <System::Byte> ^ binaryAttribute);public void SetCustomAttribute (System.Reflection.ConstructorInfo con, byte[] binaryAttribute);[System.Runtime.InteropServices.ComVisible(true)]
public void SetCustomAttribute (System.Reflection.ConstructorInfo con, byte[] binaryAttribute);member this.SetCustomAttribute : System.Reflection.ConstructorInfo * byte[] -> unit[<System.Runtime.InteropServices.ComVisible(true)>]
member this.SetCustomAttribute : System.Reflection.ConstructorInfo * byte[] -> unitPublic Sub SetCustomAttribute (con As ConstructorInfo, binaryAttribute As Byte())Parâmetros
- con
- ConstructorInfo
O construtor do atributo personalizado.
- binaryAttribute
- Byte[]
Um blob de bytes que representa os atributos.
- Atributos
Exceções
con ou binaryAttribute é null.
O tipo pai desse campo é concluído.
Exemplos
O exemplo de código a seguir ilustra o uso de SetCustomAttribute no contexto de FieldBuilder, usando um blob de bytes.
using namespace System;
using namespace System::Threading;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
[AttributeUsage(AttributeTargets::All,AllowMultiple=false)]
public ref class MyAttribute1: public Attribute
{
public:
String^ myCustomAttributeValue;
MyAttribute1( String^ myString )
{
myCustomAttributeValue = myString;
}
};
[AttributeUsage(AttributeTargets::All,AllowMultiple=false)]
public ref class MyAttribute2: public Attribute
{
public:
bool myCustomAttributeValue;
MyAttribute2( bool myBool )
{
myCustomAttributeValue = myBool;
}
};
Type^ CreateCallee( AppDomain^ currentDomain )
{
// Create a simple name for the assembly.
AssemblyName^ myAssemblyName = gcnew AssemblyName;
myAssemblyName->Name = "EmittedAssembly";
// Create the called dynamic assembly.
AssemblyBuilder^ myAssemblyBuilder = currentDomain->DefineDynamicAssembly( myAssemblyName, AssemblyBuilderAccess::RunAndSave );
ModuleBuilder^ myModuleBuilder = myAssemblyBuilder->DefineDynamicModule( "EmittedModule", "EmittedModule.mod" );
// Define a public class named 'CustomClass' in the assembly.
TypeBuilder^ myTypeBuilder = myModuleBuilder->DefineType( "CustomClass", TypeAttributes::Public );
// Define a private String field named 'MyField' in the type.
FieldBuilder^ myFieldBuilder = myTypeBuilder->DefineField( "MyField", String::typeid, FieldAttributes::Public );
Type^ myAttributeType1 = MyAttribute1::typeid;
// Create a Constructorinfo Object* for attribute 'MyAttribute1'.
array<Type^>^type1 = {String::typeid};
ConstructorInfo^ myConstructorInfo = myAttributeType1->GetConstructor( type1 );
// Create the CustomAttribute instance of attribute of type 'MyAttribute1'.
array<Object^>^obj1 = {"Test"};
CustomAttributeBuilder^ attributeBuilder = gcnew CustomAttributeBuilder( myConstructorInfo,obj1 );
// Set the CustomAttribute 'MyAttribute1' to the Field.
myFieldBuilder->SetCustomAttribute( attributeBuilder );
Type^ myAttributeType2 = MyAttribute2::typeid;
// Create a Constructorinfo Object* for attribute 'MyAttribute2'.
array<Type^>^type2 = {bool::typeid};
ConstructorInfo^ myConstructorInfo2 = myAttributeType2->GetConstructor( type2 );
// Set the CustomAttribute 'MyAttribute2' to the Field.
array<Byte>^bytes = {01,00,01,00,00};
myFieldBuilder->SetCustomAttribute( myConstructorInfo2, bytes );
// Create a method.
array<Type^>^type3 = {String::typeid,int::typeid};
MethodBuilder^ myMethodBuilder = myTypeBuilder->DefineMethod( "MyMethod", MethodAttributes::Public, nullptr, type3 );
ILGenerator^ myILGenerator = myMethodBuilder->GetILGenerator();
myILGenerator->Emit( OpCodes::Ldarg_0 );
myILGenerator->Emit( OpCodes::Ldarg_1 );
myILGenerator->Emit( OpCodes::Stfld, myFieldBuilder );
myILGenerator->EmitWriteLine( "Value of the Field is :" );
myILGenerator->EmitWriteLine( myFieldBuilder );
myILGenerator->Emit( OpCodes::Ret );
return myTypeBuilder->CreateType();
}
int main()
{
try
{
Type^ myCustomClass = CreateCallee( Thread::GetDomain() );
// Construct an instance of a type.
Object^ myObject = Activator::CreateInstance( myCustomClass );
Console::WriteLine( "FieldBuilder Sample" );
// Find a method in this type and call it on this Object*.
MethodInfo^ myMethodInfo = myCustomClass->GetMethod( "MyMethod" );
array<Object^>^obj1 = {"Sample string",3};
myMethodInfo->Invoke( myObject, obj1 );
// Retrieve the values of Attributes applied to field and display to console.
array<FieldInfo^>^myFieldInfo = myCustomClass->GetFields();
for ( int i = 0; i < myFieldInfo->Length; i++ )
{
array<Object^>^attributes = myFieldInfo[ i ]->GetCustomAttributes( true );
for ( int index = 0; index < attributes->Length; index++ )
{
if ( dynamic_cast<MyAttribute1^>(attributes[ index ]) )
{
MyAttribute1^ myCustomAttribute = safe_cast<MyAttribute1^>(attributes[ index ]);
Console::WriteLine( "Attribute Value of (MyAttribute1): {0}", myCustomAttribute->myCustomAttributeValue );
}
if ( dynamic_cast<MyAttribute2^>(attributes[ index ]) )
{
MyAttribute2^ myCustomAttribute = safe_cast<MyAttribute2^>(attributes[ index ]);
Console::WriteLine( "Attribute Value of (MyAttribute2): {0}", myCustomAttribute->myCustomAttributeValue );
}
}
}
}
catch ( Exception^ e )
{
Console::WriteLine( "Exception Caught {0}", e->Message );
}
}
using System;
using System.Threading;
using System.Reflection;
using System.Reflection.Emit;
namespace MySample
{
[AttributeUsage(AttributeTargets.All, AllowMultiple = false)]
public class MyAttribute1 :Attribute
{
public string myCustomAttributeValue;
public MyAttribute1(string myString)
{
myCustomAttributeValue = myString;
}
}
[AttributeUsage(AttributeTargets.All, AllowMultiple = false)]
public class MyAttribute2 :Attribute
{
public bool myCustomAttributeValue;
public MyAttribute2(bool myBool)
{
myCustomAttributeValue = myBool;
}
}
class FieldBuilder_Sample
{
private static Type CreateCallee(AppDomain currentDomain)
{
// Create a simple name for the assembly.
AssemblyName myAssemblyName = new AssemblyName();
myAssemblyName.Name = "EmittedAssembly";
// Create the called dynamic assembly.
AssemblyBuilder myAssemblyBuilder =
currentDomain.DefineDynamicAssembly(myAssemblyName, AssemblyBuilderAccess.RunAndSave);
ModuleBuilder myModuleBuilder =
myAssemblyBuilder.DefineDynamicModule("EmittedModule","EmittedModule.mod");
// Define a public class named 'CustomClass' in the assembly.
TypeBuilder myTypeBuilder = myModuleBuilder.DefineType("CustomClass",
TypeAttributes.Public);
// Define a private String field named 'MyField' in the type.
FieldBuilder myFieldBuilder =
myTypeBuilder.DefineField("MyField", typeof(String), FieldAttributes.Public);
Type myAttributeType1 = typeof(MyAttribute1);
// Create a Constructorinfo object for attribute 'MyAttribute1'.
ConstructorInfo myConstructorInfo = myAttributeType1.GetConstructor(
new Type[1]{typeof(string)});
// Create the CustomAttribute instance of attribute of type 'MyAttribute1'.
CustomAttributeBuilder attributeBuilder =
new CustomAttributeBuilder( myConstructorInfo,new object[1]{"Test"});
// Set the CustomAttribute 'MyAttribute1' to the Field.
myFieldBuilder.SetCustomAttribute(attributeBuilder);
Type myAttributeType2 = typeof(MyAttribute2);
// Create a Constructorinfo object for attribute 'MyAttribute2'.
ConstructorInfo myConstructorInfo2 = myAttributeType2.GetConstructor(
new Type[1]{typeof(bool)});
// Set the CustomAttribute 'MyAttribute2' to the Field.
myFieldBuilder.SetCustomAttribute(myConstructorInfo2,new byte[]{01,00,01,00,00});
// Create a method.
MethodBuilder myMethodBuilder= myTypeBuilder.DefineMethod("MyMethod",
MethodAttributes.Public,null,new Type[2]{typeof(string),typeof(int)});
ILGenerator myILGenerator = myMethodBuilder.GetILGenerator();
myILGenerator.Emit(OpCodes.Ldarg_0);
myILGenerator.Emit(OpCodes.Ldarg_1);
myILGenerator.Emit(OpCodes.Stfld, myFieldBuilder);
myILGenerator.EmitWriteLine("Value of the Field is :");
myILGenerator.EmitWriteLine(myFieldBuilder);
myILGenerator.Emit(OpCodes.Ret);
return myTypeBuilder.CreateType();
}
public static void Main()
{
try
{
Type myCustomClass = CreateCallee(Thread.GetDomain());
// Construct an instance of a type.
Object myObject = Activator.CreateInstance(myCustomClass);
Console.WriteLine( "FieldBuilder Sample");
// Find a method in this type and call it on this object.
MethodInfo myMethodInfo = myCustomClass.GetMethod("MyMethod");
myMethodInfo.Invoke(myObject, new object[2]{"Sample string",3});
// Retrieve the values of Attributes applied to field and display to console.
FieldInfo[] myFieldInfo = myCustomClass.GetFields();
for(int i =0;i<myFieldInfo.Length;i++)
{
object[] attributes = myFieldInfo[i].GetCustomAttributes(true);
for(int index=0; index < attributes.Length; index++)
{
if(attributes[index] is MyAttribute1)
{
MyAttribute1 myCustomAttribute = (MyAttribute1)attributes[index];
Console.WriteLine("Attribute Value of (MyAttribute1): "
+ myCustomAttribute.myCustomAttributeValue);
}
if(attributes[index] is MyAttribute2)
{
MyAttribute2 myCustomAttribute = (MyAttribute2)attributes[index];
Console.WriteLine("Attribute Value of (MyAttribute2): "
+ myCustomAttribute.myCustomAttributeValue);
}
}
}
}
catch (Exception e)
{
Console.WriteLine("Exception Caught "+e.Message);
}
}
}
}
Imports System.Threading
Imports System.Reflection
Imports System.Reflection.Emit
Namespace MySample
<AttributeUsage(AttributeTargets.All, AllowMultiple:=False)> Public Class MyAttribute1
Inherits Attribute
Public myCustomAttributeValue As String
Public Sub New(ByVal myString As String)
myCustomAttributeValue = myString
End Sub
End Class
<AttributeUsage(AttributeTargets.All, AllowMultiple:=False)> Public Class MyAttribute2
Inherits Attribute
Public myCustomAttributeValue As Boolean
Public Sub New(ByVal myBool As Boolean)
myCustomAttributeValue = myBool
End Sub
End Class
Class FieldBuilder_Sample
Private Shared Function CreateCallee(ByVal currentDomain As AppDomain) As Type
' Create a simple name for the assembly.
Dim myAssemblyName As New AssemblyName()
myAssemblyName.Name = "EmittedAssembly"
' Create the called dynamic assembly.
Dim myAssemblyBuilder As AssemblyBuilder = _
currentDomain.DefineDynamicAssembly(myAssemblyName, _
AssemblyBuilderAccess.RunAndSave)
Dim myModuleBuilder As ModuleBuilder = _
myAssemblyBuilder.DefineDynamicModule("EmittedModule", _
"EmittedModule.mod")
' Define a public class named 'CustomClass' in the assembly.
Dim myTypeBuilder As TypeBuilder = myModuleBuilder.DefineType("CustomClass", _
TypeAttributes.Public)
' Define a private String field named 'MyField' in the type.
Dim myFieldBuilder As FieldBuilder = myTypeBuilder.DefineField("MyField", _
GetType(String), FieldAttributes.Public)
Dim myAttributeType1 As Type = GetType(MyAttribute1)
' Create a Constructorinfo object for attribute 'MyAttribute1'.
Dim myConstructorInfo As ConstructorInfo = _
myAttributeType1.GetConstructor(New Type(0) {GetType(String)})
' Create the CustomAttribute instance of attribute of type 'MyAttribute1'.
Dim attributeBuilder As _
New CustomAttributeBuilder(myConstructorInfo, New Object(0) {"Test"})
' Set the CustomAttribute 'MyAttribute1' to the Field.
myFieldBuilder.SetCustomAttribute(attributeBuilder)
Dim myAttributeType2 As Type = GetType(MyAttribute2)
' Create a Constructorinfo object for attribute 'MyAttribute2'.
Dim myConstructorInfo2 As ConstructorInfo = _
myAttributeType2.GetConstructor(New Type(0) {GetType(Boolean)})
' Set the CustomAttribute 'MyAttribute2' to the Field.
myFieldBuilder.SetCustomAttribute(myConstructorInfo2, New Byte() {1, 0, 1, 0, 0})
' Create a method.
Dim myMethodBuilder As MethodBuilder = myTypeBuilder.DefineMethod("MyMethod", _
MethodAttributes.Public, Nothing, New Type(1) {GetType(String), GetType(Integer)})
Dim myILGenerator As ILGenerator = myMethodBuilder.GetILGenerator()
myILGenerator.Emit(OpCodes.Ldarg_0)
myILGenerator.Emit(OpCodes.Ldarg_1)
myILGenerator.Emit(OpCodes.Stfld, myFieldBuilder)
myILGenerator.EmitWriteLine("Value of the Field is :")
myILGenerator.EmitWriteLine(myFieldBuilder)
myILGenerator.Emit(OpCodes.Ret)
Return myTypeBuilder.CreateType()
End Function 'CreateCallee
Public Shared Sub Main()
Try
Dim myCustomClass As Type = CreateCallee(Thread.GetDomain())
' Construct an instance of a type.
Dim myObject As Object = Activator.CreateInstance(myCustomClass)
Console.WriteLine("FieldBuilder Sample")
' Find a method in this type and call it on this object.
Dim myMethodInfo As MethodInfo = myCustomClass.GetMethod("MyMethod")
myMethodInfo.Invoke(myObject, New Object(1) {"Sample string", 3})
' Retrieve the values of Attributes applied to field and display to console.
Dim myFieldInfo As FieldInfo() = myCustomClass.GetFields()
Dim i As Integer
For i = 0 To myFieldInfo.Length - 1
Dim attributes As Object() = myFieldInfo(i).GetCustomAttributes(True)
Dim index As Integer
For index = 0 To attributes.Length - 1
If TypeOf attributes(index) Is MyAttribute1 Then
Dim myCustomAttribute As MyAttribute1 = _
CType(attributes(index), MyAttribute1)
Console.WriteLine("Attribute Value of (MyAttribute1): " _
+ myCustomAttribute.myCustomAttributeValue.ToString())
End If
If TypeOf attributes(index) Is MyAttribute2 Then
Dim myCustomAttribute As MyAttribute2 = _
CType(attributes(index), MyAttribute2)
Console.WriteLine("Attribute Value of (MyAttribute2): " _
+ myCustomAttribute.myCustomAttributeValue.ToString())
End If
Next index
Next i
Catch e as Exception
Console.WriteLine("Exception Caught "+e.Message)
End Try
End Sub
End Class
End Namespace 'MySample
Comentários
Para obter informações sobre como formatar binaryAttribute, consulte a especificação de metadados na Partição II da especificação da CLI (Common Language Infrastructure).
Aplica-se a
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