CustomAttributeTypedArgument.Value 속성
정의
중요
일부 정보는 릴리스되기 전에 상당 부분 수정될 수 있는 시험판 제품과 관련이 있습니다. Microsoft는 여기에 제공된 정보에 대해 어떠한 명시적이거나 묵시적인 보증도 하지 않습니다.
간단한 인수 또는 배열 인수 요소의 경우에는 인수의 값을 가져오고, 배열 인수의 경우에는 값 컬렉션을 가져옵니다.
public:
property System::Object ^ Value { System::Object ^ get(); };
public object Value { get; }
public object? Value { get; }
member this.Value : obj
Public ReadOnly Property Value As Object
속성 값
인수 또는 요소의 값을 나타내는 개체이거나, 배열 형식 인수의 값을 나타내는 ReadOnlyCollection<T> 개체의 제네릭 CustomAttributeTypedArgument입니다.
예제
다음 예제에서는 4개의 생성자와 4개의 속성을 사용하여 사용자 지정 특성을 정의합니다. 두 속성은 읽기 전용이며 생성자의 위치 매개 변수를 사용하여 설정됩니다. 다른 두 속성은 읽기/쓰기이며 명명된 인수를 사용해야만 설정할 수 있습니다. 한 위치 속성은 문자열 배열이고, 명명된 속성은 정수 배열입니다.
어셈블리, 어셈블리에 선언된 형식, 형식의 메서드, 메서드의 매개 변수에 특성이 적용됩니다. 이러한 경우 다른 생성자가 사용됩니다. 실행되면 어셈블리는 리플렉션 전용 컨텍스트로 자신을 로드하고 사용자 지정 특성을 표시합니다.
형식에 적용되는 특성은 위치 인수와 명명된 인수를 모두 포함하는 배열 속성을 보여 줍니다.
Value 속성은 사용자 지정 특성 데이터를 표시하는 메서드에서 ShowValueOrArray
특성 값을 표시하는 데 사용됩니다.
using namespace System;
using namespace System::Reflection;
using namespace System::Collections::Generic;
using namespace System::Collections::ObjectModel;
// An enumeration used by the ExampleAttribute class.
public enum class ExampleKind
{
FirstKind, SecondKind, ThirdKind, FourthKind
};
// An example attribute. The attribute can be applied to all
// targets, from assemblies to parameters.
//
[AttributeUsage(AttributeTargets::All)]
public ref class ExampleAttribute: public Attribute
{
private:
// Data for properties.
ExampleKind kindValue;
String^ noteValue;
array<String^>^ arrayStrings;
array<int>^ arrayNumbers;
// Constructors.
void ExampleAttributeInitialize( ExampleKind initKind, array<String^>^ initStrings )
{
kindValue = initKind;
arrayStrings = initStrings;
}
public:
ExampleAttribute()
{
ExampleAttributeInitialize( ExampleKind::FirstKind, nullptr );
}
ExampleAttribute( ExampleKind initKind )
{
ExampleAttributeInitialize( initKind, nullptr );
}
ExampleAttribute( ExampleKind initKind, array<String^>^ initStrings )
{
ExampleAttributeInitialize( initKind, initStrings );
}
// Properties. The Note and Numbers properties must be read/write, so they
// can be used as named parameters.
//
property ExampleKind Kind
{
ExampleKind get()
{
return kindValue;
}
}
property array<String^>^ Strings
{
array<String^>^ get()
{
return arrayStrings;
}
}
property String^ Note
{
String^ get()
{
return noteValue;
}
void set( String^ value )
{
noteValue = value;
}
}
property array<int>^ Numbers
{
array<int>^ get()
{
return arrayNumbers;
}
void set( array<int>^ value )
{
arrayNumbers = value;
}
}
};
// The example attribute is applied to the assembly.
[assembly:Example(ExampleKind::ThirdKind,Note="This is a note on the assembly.")];
// The example attribute is applied to the test class.
//
[Example(ExampleKind::SecondKind,
gcnew array<String^> { "String array argument, line 1",
"String array argument, line 2",
"String array argument, line 3" },
Note="This is a note on the class.",
Numbers = gcnew array<int> { 53, 57, 59 })]
public ref class Test
{
public:
// The example attribute is applied to a method, using the
// parameterless constructor and supplying a named argument.
// The attribute is also applied to the method parameter.
//
[Example(Note="This is a note on a method.")]
void TestMethod( [Example] Object^ arg ){}
// Main() gets objects representing the assembly, the test
// type, the test method, and the method parameter. Custom
// attribute data is displayed for each of these.
//
static void Main()
{
Assembly^ assembly = Assembly::ReflectionOnlyLoad( "Source" );
Type^ t = assembly->GetType( "Test" );
MethodInfo^ m = t->GetMethod( "TestMethod" );
array<ParameterInfo^>^p = m->GetParameters();
Console::WriteLine( "\r\nAttributes for assembly: '{0}'", assembly );
ShowAttributeData( CustomAttributeData::GetCustomAttributes( assembly ) );
Console::WriteLine( "\r\nAttributes for type: '{0}'", t );
ShowAttributeData( CustomAttributeData::GetCustomAttributes( t ) );
Console::WriteLine( "\r\nAttributes for member: '{0}'", m );
ShowAttributeData( CustomAttributeData::GetCustomAttributes( m ) );
Console::WriteLine( "\r\nAttributes for parameter: '{0}'", p );
ShowAttributeData( CustomAttributeData::GetCustomAttributes( p[ 0 ] ) );
}
private:
static void ShowValueOrArray(CustomAttributeTypedArgument^ cata)
{
if (cata->Value->GetType() == ReadOnlyCollection<CustomAttributeTypedArgument>::typeid)
{
Console::WriteLine(" Array of '{0}':", cata->ArgumentType);
for each (CustomAttributeTypedArgument^ cataElement in
(ReadOnlyCollection<CustomAttributeTypedArgument>^) cata->Value)
{
Console::WriteLine(" Type: '{0}' Value: '{1}'",
cataElement->ArgumentType, cataElement->Value);
}
}
else
{
Console::WriteLine( " Type: '{0}' Value: '{1}'",
cata->ArgumentType, cata->Value );
}
}
static void ShowAttributeData( IList< CustomAttributeData^ >^ attributes )
{
for each ( CustomAttributeData^ cad in attributes )
{
Console::WriteLine( " {0}", cad );
Console::WriteLine( " Constructor: '{0}'", cad->Constructor );
Console::WriteLine( " Constructor arguments:" );
for each ( CustomAttributeTypedArgument^ cata in cad->ConstructorArguments )
{
ShowValueOrArray(cata);
}
Console::WriteLine( " Named arguments:" );
for each ( CustomAttributeNamedArgument cana in cad->NamedArguments )
{
Console::WriteLine( " MemberInfo: '{0}'", cana.MemberInfo );
ShowValueOrArray(cana.TypedValue);
}
}
}
};
int main()
{
Test::Main();
}
/* This code example produces output similar to the following:
Attributes for assembly: 'source, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'
[System.Runtime.CompilerServices.CompilationRelaxationsAttribute((Int32)8)]
Constructor: 'Void .ctor(Int32)'
Constructor arguments:
Type: 'System.Int32' Value: '8'
Named arguments:
[System.Runtime.CompilerServices.RuntimeCompatibilityAttribute(WrapNonExceptionThrows = True)]
Constructor: 'Void .ctor()'
Constructor arguments:
Named arguments:
MemberInfo: 'Boolean WrapNonExceptionThrows'
Type: 'System.Boolean' Value: 'True'
[ExampleAttribute((ExampleKind)2, Note = "This is a note on the assembly.")]
Constructor: 'Void .ctor(ExampleKind)'
Constructor arguments:
Type: 'ExampleKind' Value: '2'
Named arguments:
MemberInfo: 'System.String Note'
Type: 'System.String' Value: 'This is a note on the assembly.'
Attributes for type: 'Test'
[ExampleAttribute((ExampleKind)1, new String[3] { "String array argument, line 1", "String array argument, line 2", "String array argument, line 3" }, Note = "This is a note on the class.", Numbers = new Int32[3] { 53, 57, 59 })]
Constructor: 'Void .ctor(ExampleKind, System.String[])'
Constructor arguments:
Type: 'ExampleKind' Value: '1'
Array of 'System.String[]':
Type: 'System.String' Value: 'String array argument, line 1'
Type: 'System.String' Value: 'String array argument, line 2'
Type: 'System.String' Value: 'String array argument, line 3'
Named arguments:
MemberInfo: 'System.String Note'
Type: 'System.String' Value: 'This is a note on the class.'
MemberInfo: 'Int32[] Numbers'
Array of 'System.Int32[]':
Type: 'System.Int32' Value: '53'
Type: 'System.Int32' Value: '57'
Type: 'System.Int32' Value: '59'
Attributes for member: 'Void TestMethod(System.Object)'
[ExampleAttribute(Note = "This is a note on a method.")]
Constructor: 'Void .ctor()'
Constructor arguments:
Named arguments:
MemberInfo: 'System.String Note'
Type: 'System.String' Value: 'This is a note on a method.'
Attributes for parameter: 'System.Object arg'
[ExampleAttribute()]
Constructor: 'Void .ctor()'
Constructor arguments:
Named arguments:
*/
using System;
using System.Reflection;
using System.Collections.Generic;
using System.Collections.ObjectModel;
// The example attribute is applied to the assembly.
[assembly:Example(ExampleKind.ThirdKind, Note="This is a note on the assembly.")]
// An enumeration used by the ExampleAttribute class.
public enum ExampleKind
{
FirstKind,
SecondKind,
ThirdKind,
FourthKind
};
// An example attribute. The attribute can be applied to all
// targets, from assemblies to parameters.
//
[AttributeUsage(AttributeTargets.All)]
public class ExampleAttribute : Attribute
{
// Data for properties.
private ExampleKind kindValue;
private string noteValue;
private string[] arrayStrings;
private int[] arrayNumbers;
// Constructors. The parameterless constructor (.ctor) calls
// the constructor that specifies ExampleKind and an array of
// strings, and supplies the default values.
//
public ExampleAttribute(ExampleKind initKind, string[] initStrings)
{
kindValue = initKind;
arrayStrings = initStrings;
}
public ExampleAttribute(ExampleKind initKind) : this(initKind, null) {}
public ExampleAttribute() : this(ExampleKind.FirstKind, null) {}
// Properties. The Note and Numbers properties must be read/write, so they
// can be used as named parameters.
//
public ExampleKind Kind { get { return kindValue; }}
public string[] Strings { get { return arrayStrings; }}
public string Note
{
get { return noteValue; }
set { noteValue = value; }
}
public int[] Numbers
{
get { return arrayNumbers; }
set { arrayNumbers = value; }
}
}
// The example attribute is applied to the test class.
//
[Example(ExampleKind.SecondKind,
new string[] { "String array argument, line 1",
"String array argument, line 2",
"String array argument, line 3" },
Note="This is a note on the class.",
Numbers = new int[] { 53, 57, 59 })]
public class Test
{
// The example attribute is applied to a method, using the
// parameterless constructor and supplying a named argument.
// The attribute is also applied to the method parameter.
//
[Example(Note="This is a note on a method.")]
public void TestMethod([Example] object arg) { }
// Main() gets objects representing the assembly, the test
// type, the test method, and the method parameter. Custom
// attribute data is displayed for each of these.
//
public static void Main()
{
Assembly asm = Assembly.ReflectionOnlyLoad("Source");
Type t = asm.GetType("Test");
MethodInfo m = t.GetMethod("TestMethod");
ParameterInfo[] p = m.GetParameters();
Console.WriteLine("\r\nAttributes for assembly: '{0}'", asm);
ShowAttributeData(CustomAttributeData.GetCustomAttributes(asm));
Console.WriteLine("\r\nAttributes for type: '{0}'", t);
ShowAttributeData(CustomAttributeData.GetCustomAttributes(t));
Console.WriteLine("\r\nAttributes for member: '{0}'", m);
ShowAttributeData(CustomAttributeData.GetCustomAttributes(m));
Console.WriteLine("\r\nAttributes for parameter: '{0}'", p);
ShowAttributeData(CustomAttributeData.GetCustomAttributes(p[0]));
}
private static void ShowAttributeData(
IList<CustomAttributeData> attributes)
{
foreach( CustomAttributeData cad in attributes )
{
Console.WriteLine(" {0}", cad);
Console.WriteLine(" Constructor: '{0}'", cad.Constructor);
Console.WriteLine(" Constructor arguments:");
foreach( CustomAttributeTypedArgument cata
in cad.ConstructorArguments )
{
ShowValueOrArray(cata);
}
Console.WriteLine(" Named arguments:");
foreach( CustomAttributeNamedArgument cana
in cad.NamedArguments )
{
Console.WriteLine(" MemberInfo: '{0}'",
cana.MemberInfo);
ShowValueOrArray(cana.TypedValue);
}
}
}
private static void ShowValueOrArray(CustomAttributeTypedArgument cata)
{
if (cata.Value.GetType() == typeof(ReadOnlyCollection<CustomAttributeTypedArgument>))
{
Console.WriteLine(" Array of '{0}':", cata.ArgumentType);
foreach (CustomAttributeTypedArgument cataElement in
(ReadOnlyCollection<CustomAttributeTypedArgument>) cata.Value)
{
Console.WriteLine(" Type: '{0}' Value: '{1}'",
cataElement.ArgumentType, cataElement.Value);
}
}
else
{
Console.WriteLine(" Type: '{0}' Value: '{1}'",
cata.ArgumentType, cata.Value);
}
}
}
/* This code example produces output similar to the following:
Attributes for assembly: 'source, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'
[System.Runtime.CompilerServices.CompilationRelaxationsAttribute((Int32)8)]
Constructor: 'Void .ctor(Int32)'
Constructor arguments:
Type: 'System.Int32' Value: '8'
Named arguments:
[System.Runtime.CompilerServices.RuntimeCompatibilityAttribute(WrapNonExceptionThrows = True)]
Constructor: 'Void .ctor()'
Constructor arguments:
Named arguments:
MemberInfo: 'Boolean WrapNonExceptionThrows'
Type: 'System.Boolean' Value: 'True'
[ExampleAttribute((ExampleKind)2, Note = "This is a note on the assembly.")]
Constructor: 'Void .ctor(ExampleKind)'
Constructor arguments:
Type: 'ExampleKind' Value: '2'
Named arguments:
MemberInfo: 'System.String Note'
Type: 'System.String' Value: 'This is a note on the assembly.'
Attributes for type: 'Test'
[ExampleAttribute((ExampleKind)1, new String[3] { "String array argument, line 1", "String array argument, line 2", "String array argument, line 3" }, Note = "This is a note on the class.", Numbers = new Int32[3] { 53, 57, 59 })]
Constructor: 'Void .ctor(ExampleKind, System.String[])'
Constructor arguments:
Type: 'ExampleKind' Value: '1'
Array of 'System.String[]':
Type: 'System.String' Value: 'String array argument, line 1'
Type: 'System.String' Value: 'String array argument, line 2'
Type: 'System.String' Value: 'String array argument, line 3'
Named arguments:
MemberInfo: 'System.String Note'
Type: 'System.String' Value: 'This is a note on the class.'
MemberInfo: 'Int32[] Numbers'
Array of 'System.Int32[]':
Type: 'System.Int32' Value: '53'
Type: 'System.Int32' Value: '57'
Type: 'System.Int32' Value: '59'
Attributes for member: 'Void TestMethod(System.Object)'
[ExampleAttribute(Note = "This is a note on a method.")]
Constructor: 'Void .ctor()'
Constructor arguments:
Named arguments:
MemberInfo: 'System.String Note'
Type: 'System.String' Value: 'This is a note on a method.'
Attributes for parameter: 'System.Object arg'
[ExampleAttribute()]
Constructor: 'Void .ctor()'
Constructor arguments:
Named arguments:
*/
Imports System.Reflection
Imports System.Collections.Generic
Imports System.Collections.ObjectModel
' The example attribute is applied to the assembly.
<Assembly:Example(ExampleKind.ThirdKind, Note:="This is a note on the assembly.")>
' An enumeration used by the ExampleAttribute class.
Public Enum ExampleKind
FirstKind
SecondKind
ThirdKind
FourthKind
End Enum
' An example attribute. The attribute can be applied to all
' targets, from assemblies to parameters.
'
<AttributeUsage(AttributeTargets.All)> _
Public Class ExampleAttribute
Inherits Attribute
' Data for properties.
Private kindValue As ExampleKind
Private noteValue As String
Private arrayStrings() As String
Private arrayNumbers() As Integer
' Constructors. The parameterless constructor (.ctor) calls
' the constructor that specifies ExampleKind and an array of
' strings, and supplies the default values.
'
Public Sub New(ByVal initKind As ExampleKind, ByVal initStrings() As String)
kindValue = initKind
arrayStrings = initStrings
End Sub
Public Sub New(ByVal initKind As ExampleKind)
Me.New(initKind, Nothing)
End Sub
Public Sub New()
Me.New(ExampleKind.FirstKind, Nothing)
End Sub
' Properties. The Note and Numbers properties must be read/write, so they
' can be used as named parameters.
'
Public ReadOnly Property Kind As ExampleKind
Get
Return kindValue
End Get
End Property
Public ReadOnly Property Strings As String()
Get
Return arrayStrings
End Get
End Property
Public Property Note As String
Get
Return noteValue
End Get
Set
noteValue = value
End Set
End Property
Public Property Numbers As Integer()
Get
Return arrayNumbers
End Get
Set
arrayNumbers = value
End Set
End Property
End Class
' The example attribute is applied to the test class.
'
<Example(ExampleKind.SecondKind, _
New String() { "String array argument, line 1", _
"String array argument, line 2", _
"String array argument, line 3" }, _
Note := "This is a note on the class.", _
Numbers := New Integer() { 53, 57, 59 })> _
Public Class Test
' The example attribute is applied to a method, using the
' parameterless constructor and supplying a named argument.
' The attribute is also applied to the method parameter.
'
<Example(Note:="This is a note on a method.")> _
Public Sub TestMethod(<Example()> ByVal arg As Object)
End Sub
' Sub Main gets objects representing the assembly, the test
' type, the test method, and the method parameter. Custom
' attribute data is displayed for each of these.
'
Public Shared Sub Main()
Dim asm As [Assembly] = Assembly.ReflectionOnlyLoad("source")
Dim t As Type = asm.GetType("Test")
Dim m As MethodInfo = t.GetMethod("TestMethod")
Dim p() As ParameterInfo = m.GetParameters()
Console.WriteLine(vbCrLf & "Attributes for assembly: '{0}'", asm)
ShowAttributeData(CustomAttributeData.GetCustomAttributes(asm))
Console.WriteLine(vbCrLf & "Attributes for type: '{0}'", t)
ShowAttributeData(CustomAttributeData.GetCustomAttributes(t))
Console.WriteLine(vbCrLf & "Attributes for member: '{0}'", m)
ShowAttributeData(CustomAttributeData.GetCustomAttributes(m))
Console.WriteLine(vbCrLf & "Attributes for parameter: '{0}'", p)
ShowAttributeData(CustomAttributeData.GetCustomAttributes(p(0)))
End Sub
Private Shared Sub ShowAttributeData( _
ByVal attributes As IList(Of CustomAttributeData))
For Each cad As CustomAttributeData _
In CType(attributes, IEnumerable(Of CustomAttributeData))
Console.WriteLine(" {0}", cad)
Console.WriteLine(" Constructor: '{0}'", cad.Constructor)
Console.WriteLine(" Constructor arguments:")
For Each cata As CustomAttributeTypedArgument _
In CType(cad.ConstructorArguments, IEnumerable(Of CustomAttributeTypedArgument))
ShowValueOrArray(cata)
Next
Console.WriteLine(" Named arguments:")
For Each cana As CustomAttributeNamedArgument _
In CType(cad.NamedArguments, IEnumerable(Of CustomAttributeNamedArgument))
Console.WriteLine(" MemberInfo: '{0}'", _
cana.MemberInfo)
ShowValueOrArray(cana.TypedValue)
Next
Next
End Sub
Private Shared Sub ShowValueOrArray(ByVal cata As CustomAttributeTypedArgument)
If cata.Value.GetType() Is GetType(ReadOnlyCollection(Of CustomAttributeTypedArgument)) Then
Console.WriteLine(" Array of '{0}':", cata.ArgumentType)
For Each cataElement As CustomAttributeTypedArgument In cata.Value
Console.WriteLine(" Type: '{0}' Value: '{1}'", _
cataElement.ArgumentType, cataElement.Value)
Next
Else
Console.WriteLine(" Type: '{0}' Value: '{1}'", _
cata.ArgumentType, cata.Value)
End If
End Sub
End Class
' This code example produces output similar to the following:
'
'Attributes for assembly: 'source, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'
' [System.Runtime.CompilerServices.CompilationRelaxationsAttribute((Int32)8)]
' Constructor: 'Void .ctor(Int32)'
' Constructor arguments:
' Type: 'System.Int32' Value: '8'
' Named arguments:
' [System.Runtime.CompilerServices.RuntimeCompatibilityAttribute(WrapNonExceptionThrows = True)]
' Constructor: 'Void .ctor()'
' Constructor arguments:
' Named arguments:
' MemberInfo: 'Boolean WrapNonExceptionThrows'
' Type: 'System.Boolean' Value: 'True'
' [ExampleAttribute((ExampleKind)2, Note = "This is a note on the assembly.")]
' Constructor: 'Void .ctor(ExampleKind)'
' Constructor arguments:
' Type: 'ExampleKind' Value: '2'
' Named arguments:
' MemberInfo: 'System.String Note'
' Type: 'System.String' Value: 'This is a note on the assembly.'
'
'Attributes for type: 'Test'
' [ExampleAttribute((ExampleKind)1, new String[3] { "String array argument, line 1", "String array argument, line 2", "String array argument, line 3" }, Note = "This is a note on the class.", Numbers = new Int32[3] { 53, 57, 59 })]
' Constructor: 'Void .ctor(ExampleKind, System.String[])'
' Constructor arguments:
' Type: 'ExampleKind' Value: '1'
' Array of 'System.String[]':
' Type: 'System.String' Value: 'String array argument, line 1'
' Type: 'System.String' Value: 'String array argument, line 2'
' Type: 'System.String' Value: 'String array argument, line 3'
' Named arguments:
' MemberInfo: 'System.String Note'
' Type: 'System.String' Value: 'This is a note on the class.'
' MemberInfo: 'Int32[] Numbers'
' Array of 'System.Int32[]':
' Type: 'System.Int32' Value: '53'
' Type: 'System.Int32' Value: '57'
' Type: 'System.Int32' Value: '59'
'
'Attributes for member: 'Void TestMethod(System.Object)'
' [ExampleAttribute(Note = "This is a note on a method.")]
' Constructor: 'Void .ctor()'
' Constructor arguments:
' Named arguments:
' MemberInfo: 'System.String Note'
' Type: 'System.String' Value: 'This is a note on a method.'
'
'Attributes for parameter: 'System.Object arg'
' [ExampleAttribute()]
' Constructor: 'Void .ctor()'
' Constructor arguments:
' Named arguments:
ArgumentType | ReflectionOnlyLoad
설명
가 CustomAttributeTypedArgument 배열 인수를 나타내는 경우 이 속성은 (ReadOnlyCollection(Of CustomAttributeTypedArgument)
Visual Basic의 경우)을 ReadOnlyCollection<CustomAttributeTypedArgument>
반환합니다. 컬렉션의 각 요소는 배열 인수의 해당 요소를 나타냅니다.
값의 형식은 속성을 사용하여 ArgumentType 가져올 수 있습니다. ArgumentType 는 단순 인수 또는 배열 인수의 요소에 대해 속성에서 Value 반환하는 값의 실제 형식을 가져옵니다. 배열 인수에 대한 배열 형식을 반환합니다.
적용 대상
.NET