AttributeTargets Enumeration
 

Specifies the application elements on which it is valid to apply an attribute.

This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

Syntax
[SerializableAttribute]
[FlagsAttribute]
[ComVisibleAttribute(true)]
public enum AttributeTargets
[SerializableAttribute]
[FlagsAttribute]
[ComVisibleAttribute(true)]
public enum class AttributeTargets
[<SerializableAttribute>]
[<FlagsAttribute>]
[<ComVisibleAttribute(true)>]
type AttributeTargets
<SerializableAttribute>
<FlagsAttribute>
<ComVisibleAttribute(True)>
Public Enumeration AttributeTargets
Members
Member nameDescription
All

Attribute can be applied to any application element.

Assembly

Attribute can be applied to an assembly.

Class

Attribute can be applied to a class.

Constructor

Attribute can be applied to a constructor.

Delegate

Attribute can be applied to a delegate.

Enum

Attribute can be applied to an enumeration.

Event

Attribute can be applied to an event.

Field

Attribute can be applied to a field.

GenericParameter

Attribute can be applied to a generic parameter.

Interface

Attribute can be applied to an interface.

Method

Attribute can be applied to a method.

Module

Attribute can be applied to a module.

Parameter

Attribute can be applied to a parameter.

Property

Attribute can be applied to a property.

ReturnValue

Attribute can be applied to a return value.

Struct

Attribute can be applied to a structure; that is, a value type.

Remarks

The AttributeUsageAttribute class uses this enumeration to specify the kind of element on which it is valid to apply an attribute.

AttributeTargets enumeration values can be combined with a bitwise OR operation to get the preferred combination.

Examples

The following example illustrates the application of attributes to various targets.

System_CAPS_noteNote

Visual Basic and Visual C++ syntax currently do not support the application of attributes to type parameters.

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) {
        }
    }
}
Imports System

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
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(){}

   };

}
Version Information
Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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