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AttributeTargets Enumeration

Microsoft Silverlight will reach end of support after October 2021. Learn more.

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

'Declaration
<ComVisibleAttribute(True)> _
<FlagsAttribute> _
Public Enumeration AttributeTargets
[ComVisibleAttribute(true)]
[FlagsAttribute]
public enum AttributeTargets

Members

Member name Description
Supported by Silverlight for Windows PhoneSupported by Xbox 360 Assembly Attribute can be applied to an assembly.
Supported by Silverlight for Windows PhoneSupported by Xbox 360 Module Attribute 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 Silverlight for Windows PhoneSupported by Xbox 360 Class Attribute can be applied to a class.
Supported by Silverlight for Windows PhoneSupported by Xbox 360 Struct Attribute can be applied to a structure; that is, a value type.
Supported by Silverlight for Windows PhoneSupported by Xbox 360 Enum Attribute can be applied to an enumeration.
Supported by Silverlight for Windows PhoneSupported by Xbox 360 Constructor Attribute can be applied to a constructor.
Supported by Silverlight for Windows PhoneSupported by Xbox 360 Method Attribute can be applied to a method.
Supported by Silverlight for Windows PhoneSupported by Xbox 360 Property Attribute can be applied to a property.
Supported by Silverlight for Windows PhoneSupported by Xbox 360 Field Attribute can be applied to a field.
Supported by Silverlight for Windows PhoneSupported by Xbox 360 Event Attribute can be applied to an event.
Supported by Silverlight for Windows PhoneSupported by Xbox 360 Interface Attribute can be applied to an interface.
Supported by Silverlight for Windows PhoneSupported by Xbox 360 Parameter Attribute can be applied to a parameter.
Supported by Silverlight for Windows PhoneSupported by Xbox 360 Delegate Attribute can be applied to a delegate.
Supported by Silverlight for Windows PhoneSupported by Xbox 360 ReturnValue Attribute can be applied to a return value.
Supported by Silverlight for Windows PhoneSupported by Xbox 360 GenericParameter Attribute 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 Silverlight for Windows PhoneSupported by Xbox 360 All Attribute can be applied to any application element.

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 syntax currently does not support the application of attributes to type parameters.


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) {
        }
    }
}

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.