AttributeTargets 列挙体

属性を適用できるアプリケーション要素を指定します。

この列挙体には、メンバ値をビットごとに演算するための FlagsAttribute 属性が含まれています。

<Flags>
<Serializable>
Public Enum AttributeTargets
[C#]
[Flags]
[Serializable]
public enum AttributeTargets
[C++]
[Flags]
[Serializable]
__value public enum AttributeTargets
[JScript]
public
   Flags
 Serializable
enum AttributeTargets

解説

AttributeTargets は、属性を適用できる要素の種類を指定するために AttributeUsageAttribute のパラメータとして使用されます。

AttributeTargets 列挙値にビットごとの OR 演算を組み合わせて、属性の適切な組み合わせを取得できます。

メンバ

使用例

AttributeTargets 列挙体のアプリケーションについては、次のコード例を参照してください。

 
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 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;

        static void Main(string[] args) {
        }
    }
}

[C++] 
#using <mscorlib.dll>
using namespace System;

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

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

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

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

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

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

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

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

        [FieldTarget]
        [AllTargets]
        int myInt;

        static void Main() {
        }
    };
}

[JScript] 
import System;

package AttTargsJS {
    // This attribute is only valid on a class.
    AttributeUsage(AttributeTargets.Class)
    public class ClassTargetAttribute extends Attribute {
    }

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

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

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

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

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

    ClassTargetAttribute
        ClassMethodTargetAttribute
        AllTargetsAttribute
    public class TestClassAttribute {
        ConstructorTargetAttribute
        AllTargetsAttribute
        function TestClassAttribute() {
        }

        MethodTargetAttribute
                ClassMethodTargetAttribute
                AllTargetsAttribute
        public function Method1() {
        }

        FieldTargetAttribute
                AllTargetsAttribute
        public var myInt : int;

        static function Main(args : String[]) {
        }
    }
}

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必要条件

名前空間: System

プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ, .NET Compact Framework - Windows CE .NET

アセンブリ: Mscorlib (Mscorlib.dll 内)

参照

System 名前空間 | AttributeUsageAttribute