.NET Framework Class Library
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
<[%$TOPIC/fa1240fs_en-us_VS_110_2_0_0_0_0%]> _
<[%$TOPIC/fa1240fs_en-us_VS_110_2_0_0_0_1%]> _
<[%$TOPIC/fa1240fs_en-us_VS_110_2_0_0_0_2%](True)> _
Public Enumeration AttributeTargets
[[%$TOPIC/fa1240fs_en-us_VS_110_2_0_1_0_0%]]
[[%$TOPIC/fa1240fs_en-us_VS_110_2_0_1_0_1%]]
[[%$TOPIC/fa1240fs_en-us_VS_110_2_0_1_0_2%](true)]
public enum AttributeTargets
[[%$TOPIC/fa1240fs_en-us_VS_110_2_0_2_0_0%]]
[[%$TOPIC/fa1240fs_en-us_VS_110_2_0_2_0_1%]]
[[%$TOPIC/fa1240fs_en-us_VS_110_2_0_2_0_2%](true)]
public enum class AttributeTargets
[<[%$TOPIC/fa1240fs_en-us_VS_110_2_0_3_0_0%]>]
[<[%$TOPIC/fa1240fs_en-us_VS_110_2_0_3_0_1%]>]
[<[%$TOPIC/fa1240fs_en-us_VS_110_2_0_3_0_2%](true)>]
type AttributeTargets
public enum AttributeTargets
Members
Member nameDescription
Supported by the XNA Framework Supported by Portable Class LibraryAllAttribute can be applied to any application element.
Supported by the XNA Framework Supported by Portable Class LibraryAssemblyAttribute can be applied to an assembly.
Supported by the XNA Framework Supported by Portable Class LibraryClassAttribute can be applied to a class.
Supported by the XNA Framework Supported by Portable Class LibraryConstructorAttribute can be applied to a constructor.
Supported by the XNA Framework Supported by Portable Class LibraryDelegateAttribute can be applied to a delegate.
Supported by the XNA Framework Supported by Portable Class LibraryEnumAttribute can be applied to an enumeration.
Supported by the XNA Framework Supported by Portable Class LibraryEventAttribute can be applied to an event.
Supported by the XNA Framework Supported by Portable Class LibraryFieldAttribute can be applied to a field.
Supported by the XNA Framework Supported by Portable Class LibraryGenericParameterAttribute can be applied to a generic parameter.
NoteNote

Currently, this attribute can be applied only in C#, Microsoft intermediate language (MSIL), and emitted code.

Supported by the XNA Framework Supported by Portable Class LibraryInterfaceAttribute can be applied to an interface.
Supported by the XNA Framework Supported by Portable Class LibraryMethodAttribute can be applied to a method.
Supported by the XNA Framework Supported by Portable Class LibraryModuleAttribute can be applied to a module.
NoteNote

Module refers to a portable executable file (.dll or.exe) and not a Visual Basic standard module.

Supported by the XNA Framework Supported by Portable Class LibraryParameterAttribute can be applied to a parameter.
Supported by the XNA Framework Supported by Portable Class LibraryPropertyAttribute can be applied to a property.
Supported by the XNA Framework Supported by Portable Class LibraryReturnValueAttribute can be applied to a return value.
Supported by the XNA Framework Supported by Portable Class LibraryStructAttribute 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.

NoteNote

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

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 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) {
        }
    }
}
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

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library