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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)

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

Member nameDescription
Supported by the XNA FrameworkSupported by Portable Class LibraryAllAttribute can be applied to any application element.
Supported by the XNA FrameworkSupported by Portable Class LibraryAssemblyAttribute can be applied to an assembly.
Supported by the XNA FrameworkSupported by Portable Class LibraryClassAttribute can be applied to a class.
Supported by the XNA FrameworkSupported by Portable Class LibraryConstructorAttribute can be applied to a constructor.
Supported by the XNA FrameworkSupported by Portable Class LibraryDelegateAttribute can be applied to a delegate.
Supported by the XNA FrameworkSupported by Portable Class LibraryEnumAttribute can be applied to an enumeration.
Supported by the XNA FrameworkSupported by Portable Class LibraryEventAttribute can be applied to an event.
Supported by the XNA FrameworkSupported by Portable Class LibraryFieldAttribute can be applied to a field.
Supported by the XNA FrameworkSupported 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 FrameworkSupported by Portable Class LibraryInterfaceAttribute can be applied to an interface.
Supported by the XNA FrameworkSupported by Portable Class LibraryMethodAttribute can be applied to a method.
Supported by the XNA FrameworkSupported 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 FrameworkSupported by Portable Class LibraryParameterAttribute can be applied to a parameter.
Supported by the XNA FrameworkSupported by Portable Class LibraryPropertyAttribute can be applied to a property.
Supported by the XNA FrameworkSupported by Portable Class LibraryReturnValueAttribute can be applied to a return value.
Supported by the XNA FrameworkSupported by Portable Class LibraryStructAttribute can be applied to a structure; that is, a value type.

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 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) {
        }
    }
}

.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

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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