AttributeTargets 列舉

參考

定義

命名空間:: System

組件:: System.Runtime.dll

組件:: mscorlib.dll

組件:: netstandard.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

指定有效套用屬性的應用程式項目。

此列舉支援其成員值的位元組合。

public enum class AttributeTargets

[System.Flags]
public enum AttributeTargets

[System.Flags]
[System.Serializable]
public enum AttributeTargets

[System.Flags]
[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public enum AttributeTargets

[<System.Flags>]
type AttributeTargets =

[<System.Flags>]
[<System.Serializable>]
type AttributeTargets =

[<System.Flags>]
[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type AttributeTargets =

Public Enum AttributeTargets

繼承: Object

ValueType

Enum
AttributeTargets

屬性: FlagsAttribute SerializableAttribute ComVisibleAttribute

欄位

All	32767	屬性可以套用至任何應用程式項目。
Assembly	1	屬性可以套用至組件。
Class	4	屬性可以套用至類別。
Constructor	32	屬性可以套用至建構函式。
Delegate	4096	屬性可以套用至委派。
Enum	16	屬性可以套用至列舉型別。
Event	512	屬性可以套用至事件。
Field	256	屬性可以套用至欄位。
GenericParameter	16384	屬性可以套用至泛型參數。此屬性目前僅適用於 C#、Microsoft Intermediate Language (MSIL) 和已發出的程式碼。
Interface	1024	屬性可以套用至介面。
Method	64	屬性可以套用至方法。
Module	2	屬性可以套用至模組。 `Module` 是指可攜式執行檔 (.dll 或 .exe)，且不是 Visual Basic 標準模組。
Parameter	2048	屬性可以套用至參數。
Property	128	屬性 (Attibute) 可以套用至屬性 (Property)。
ReturnValue	8192	屬性可以套用至傳回值。
Struct	8	屬性可以套用至結構，也就是實值型別 (Value Type)。

範例

下列範例說明將屬性套用至各種目標。

注意

Visual Basic 和 Visual C++ 語法目前不支援將屬性套用至類型參數。

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) {
        }
    }
}

open System

// This attribute is only valid on a class.
[<AttributeUsage(AttributeTargets.Class)>]
type ClassTargetAttribute() =
    inherit Attribute()

// This attribute is only valid on a method.
[<AttributeUsage(AttributeTargets.Method)>]
type MethodTargetAttribute() =
    inherit Attribute()

// This attribute is only valid on a constructor.
[<AttributeUsage(AttributeTargets.Constructor)>]
type ConstructorTargetAttribute() =
    inherit Attribute()

// This attribute is only valid on a field.
[<AttributeUsage(AttributeTargets.Field)>]
type FieldTargetAttribute() =
    inherit Attribute()

// This attribute is valid on a class or a method.
[<AttributeUsage(AttributeTargets.Class ||| AttributeTargets.Method)>]
type ClassMethodTargetAttribute() =
    inherit Attribute()

// This attribute is valid on a generic type parameter.
[<AttributeUsage(AttributeTargets.GenericParameter)>]
type GenericParameterTargetAttribute() =
    inherit Attribute()

// This attribute is valid on any target.
[<AttributeUsage(AttributeTargets.All)>]
type AllTargetsAttribute() =
    inherit Attribute()

[<ClassTarget>]
[<ClassMethodTarget>]
[<AllTargets>]
type TestClassAttribute [<ConstructorTarget>] [<AllTargets>] () =
    [<FieldTarget>]
    [<AllTargets>]
    let myInt = 0

    [<MethodTarget>]
    [<ClassMethodTarget>]
    [<AllTargets>]
    member _.Method1() = ()

    member _.GenericMethod<[<GenericParameterTarget; AllTargets>] 'T>(x: 'T) = ()

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

備註

類別 AttributeUsageAttribute 會使用此列舉來指定套用屬性的有效專案種類。

AttributeTargets 列舉值可以與位 OR 運算結合，以取得慣用的組合。

適用於

另請參閱

AttributeUsageAttribute

共用方式為

AttributeTargets 列舉

定義

欄位

範例

備註

適用於

另請參閱

其他資源