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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)

[ComVisibleAttribute(true)]
[FlagsAttribute]
public enum AttributeTargets

Member nameDescription
Supported by Silverlight for Windows PhoneSupported by Xbox 360AssemblyAttribute can be applied to an assembly.
Supported by Silverlight for Windows PhoneSupported by Xbox 360ModuleAttribute 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 360ClassAttribute can be applied to a class.
Supported by Silverlight for Windows PhoneSupported by Xbox 360StructAttribute can be applied to a structure; that is, a value type.
Supported by Silverlight for Windows PhoneSupported by Xbox 360EnumAttribute can be applied to an enumeration.
Supported by Silverlight for Windows PhoneSupported by Xbox 360ConstructorAttribute can be applied to a constructor.
Supported by Silverlight for Windows PhoneSupported by Xbox 360MethodAttribute can be applied to a method.
Supported by Silverlight for Windows PhoneSupported by Xbox 360PropertyAttribute can be applied to a property.
Supported by Silverlight for Windows PhoneSupported by Xbox 360FieldAttribute can be applied to a field.
Supported by Silverlight for Windows PhoneSupported by Xbox 360EventAttribute can be applied to an event.
Supported by Silverlight for Windows PhoneSupported by Xbox 360InterfaceAttribute can be applied to an interface.
Supported by Silverlight for Windows PhoneSupported by Xbox 360ParameterAttribute can be applied to a parameter.
Supported by Silverlight for Windows PhoneSupported by Xbox 360DelegateAttribute can be applied to a delegate.
Supported by Silverlight for Windows PhoneSupported by Xbox 360ReturnValueAttribute can be applied to a return value.
Supported by Silverlight for Windows PhoneSupported by Xbox 360GenericParameterAttribute 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 360AllAttribute can be applied to any application element.

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.

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.


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) {
        }
    }
}


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

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

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