AttributeTargets 列挙型

定義

属性を適用できるアプリケーション要素を指定します。Specifies the application elements on which it is valid to apply an attribute.

この列挙型には FlagsAttribute 属性があり、メンバー値ではビットごとの組み合わせを使用できます。

public enum class AttributeTargets
[System.Flags]
public enum AttributeTargets
public enum AttributeTargets
[System.Flags]
[System.Serializable]
public enum AttributeTargets
[System.Flags]
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public enum AttributeTargets
type AttributeTargets = 
Public Enum AttributeTargets
継承
AttributeTargets
属性

フィールド

All 32767

任意のアプリケーション要素に属性を適用できます。Attribute can be applied to any application element.

Assembly 1

アセンブリに属性を適用できます。Attribute can be applied to an assembly.

Class 4

クラスに属性を適用できます。Attribute can be applied to a class.

Constructor 32

コンストラクターに属性を適用できます。Attribute can be applied to a constructor.

Delegate 4096

デリゲートに属性を適用できます。Attribute can be applied to a delegate.

Enum 16

列挙体に属性を適用できます。Attribute can be applied to an enumeration.

Event 512

イベントに属性を適用できます。Attribute can be applied to an event.

Field 256

フィールドに属性を適用できます。Attribute can be applied to a field.

GenericParameter 16384

ジェネリック パラメーターに属性を適用できます。Attribute can be applied to a generic parameter. 現在、この属性は、C# コード、Microsoft Intermediate Language (MSIL) コード、および出力コードにのみ適用できます。Currently, this attribute can be applied only in C#, Microsoft intermediate language (MSIL), and emitted code.

Interface 1024

インターフェイスに属性を適用できます。Attribute can be applied to an interface.

Method 64

メソッドに属性を適用できます。Attribute can be applied to a method.

Module 2

モジュールに属性を適用できます。Attribute can be applied to a module. Module は、Visual Basic 標準モジュールではなく、移植可能な実行可能ファイル (.dll または .exe) を参照します。Module refers to a portable executable file (.dll or.exe) and not a Visual Basic standard module.

Parameter 2048

パラメーターに属性を適用できます。Attribute can be applied to a parameter.

Property 128

プロパティに属性を適用できます。Attribute can be applied to a property.

ReturnValue 8192

戻り値に属性を適用できます。Attribute can be applied to a return value.

Struct 8

構造体、つまり、値型に属性を適用できます。Attribute can be applied to a structure; that is, a value type.

次の例は、さまざまなターゲットに対する属性の適用を示しています。The following example illustrates the application of attributes to various targets.

注意

現在、Visual Basic C++と Visual 構文では、型パラメーターへの属性の適用はサポートされていません。Visual Basic and Visual C++ syntax currently do not support the application of attributes to type parameters.

using namespace System;

namespace AttTargsCS
{

   // This attribute is only valid on a class.

   [AttributeUsage(AttributeTargets::Class)]
   public ref class ClassTargetAttribute: public Attribute{};


   // This attribute is only valid on a method.

   [AttributeUsage(AttributeTargets::Method)]
   public ref class MethodTargetAttribute: public Attribute{};


   // This attribute is only valid on a constructor.

   [AttributeUsage(AttributeTargets::Constructor)]
   public ref class ConstructorTargetAttribute: public Attribute{};


   // This attribute is only valid on a field.

   [AttributeUsage(AttributeTargets::Field)]
   public ref class FieldTargetAttribute: public Attribute{};


   // This attribute is valid on a class or a method.

   [AttributeUsage(AttributeTargets::Class|AttributeTargets::Method)]
   public ref class ClassMethodTargetAttribute: public Attribute{};


   // This attribute is valid on any target.

   [AttributeUsage(AttributeTargets::All)]
   public ref class AllTargetsAttribute: public Attribute{};


   [ClassTarget]
   [ClassMethodTarget]
   [AllTargets]
   public ref class TestClassAttribute
   {
   private:

      [ConstructorTarget]
      [AllTargets]
      TestClassAttribute(){}


   public:

      [MethodTarget]
      [ClassMethodTarget]
      [AllTargets]
      void Method1(){}


      [FieldTarget]
      [AllTargets]
      int myInt;
      static void Main(){}

   };

}

using System;

namespace AttTargsCS {
    // This attribute is only valid on a class.
    [AttributeUsage(AttributeTargets.Class)]
    public class ClassTargetAttribute : Attribute {
    }

    // This attribute is only valid on a method.
    [AttributeUsage(AttributeTargets.Method)]
    public class MethodTargetAttribute : Attribute {
    }

    // This attribute is only valid on a constructor.
    [AttributeUsage(AttributeTargets.Constructor)]
    public class ConstructorTargetAttribute : Attribute {
    }

    // This attribute is only valid on a field.
    [AttributeUsage(AttributeTargets.Field)]
    public class FieldTargetAttribute : Attribute {
    }

    // This attribute is valid on a class or a method.
    [AttributeUsage(AttributeTargets.Class|AttributeTargets.Method)]
    public class ClassMethodTargetAttribute : Attribute {
    }

    // This attribute is valid on a generic type parameter.
    [AttributeUsage(AttributeTargets.GenericParameter)]
    public class GenericParameterTargetAttribute : Attribute {
    }

    // This attribute is valid on any target.
    [AttributeUsage(AttributeTargets.All)]
    public class AllTargetsAttribute : Attribute {
    }

    [ClassTarget]
    [ClassMethodTarget]
    [AllTargets]
    public class TestClassAttribute {
        [ConstructorTarget]
        [AllTargets]
        TestClassAttribute() {
        }

        [MethodTarget]
        [ClassMethodTarget]
        [AllTargets]
        public void Method1() {
        }

        [FieldTarget]
        [AllTargets]
        public int myInt;

        public void GenericMethod<
            [GenericParameterTarget, AllTargets] T>(T x) {
        }

        static void Main(string[] args) {
        }
    }
}
Module DemoModule
    ' This attribute is only valid on a class.
    <AttributeUsage(AttributeTargets.Class)> _
    Public Class ClassTargetAttribute
        Inherits Attribute
    End Class

    ' This attribute is only valid on a method.
    <AttributeUsage(AttributeTargets.Method)> _
    Public Class MethodTargetAttribute
        Inherits Attribute
    End Class

    ' This attribute is only valid on a constructor.
    <AttributeUsage(AttributeTargets.Constructor)> _
    Public Class ConstructorTargetAttribute 
        Inherits Attribute
    End Class

    ' This attribute is only valid on a field.
    <AttributeUsage(AttributeTargets.Field)> _
    Public Class FieldTargetAttribute 
        Inherits Attribute
    End Class

    ' This attribute is valid on a class or a method.
    <AttributeUsage(AttributeTargets.Class Or AttributeTargets.Method)> _
    Public Class ClassMethodTargetAttribute 
        Inherits Attribute
    End Class

    ' This attribute is valid on any target.
    <AttributeUsage(AttributeTargets.All)> _
    Public Class AllTargetsAttribute 
        Inherits Attribute
    End Class

    <ClassTarget, _
    ClassMethodTarget, _
    AllTargets> _
    Public Class TestClassAttribute
        <ConstructorTarget, _
        AllTargets> _
        Public Sub New
        End Sub

        <MethodTarget, _
        ClassMethodTarget, _
        AllTargets> _
        Public Sub Method1()
        End Sub

        <FieldTarget, _
        AllTargets> _
        Public myInt as Integer
    End Class

    Sub Main()
    End Sub
End Module

注釈

AttributeUsageAttribute クラスは、この列挙体を使用して、属性を適用するために有効な要素の種類を指定します。The AttributeUsageAttribute class uses this enumeration to specify the kind of element on which it is valid to apply an attribute.

AttributeTargets 列挙値をビットごとの OR 演算と組み合わせて、適切な組み合わせを取得できます。AttributeTargets enumeration values can be combined with a bitwise OR operation to get the preferred combination.

適用対象

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