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AttributeTargets Enumeration

.NET Framework 2.0

Other Versions

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

C++

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

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/** @attribute SerializableAttribute() */ 
/** @attribute ComVisibleAttribute(true) */ 
/** @attribute FlagsAttribute() */ 
public enum AttributeTargets

JScript

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SerializableAttribute 
ComVisibleAttribute(true) 
FlagsAttribute 
public enum AttributeTargets

Members

Member name

Description

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.

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

AttributeTargets is used as a parameter of AttributeUsageAttribute 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.

Example

The following code sample illustrates the application of the AttributeTargets enumeration:

C++

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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 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;

		static void Main(string[] args) {
		}
	}
}

Copy

package AttTargsJSL;
import System.*;

// This attribute is only valid on a class.
/** @attribute AttributeUsage(AttributeTargets.Class)
 */
public class ClassTargetAttribute extends Attribute
{
} //ClassTargetAttribute

// This attribute is only valid on a method.
/** @attribute AttributeUsage(AttributeTargets.Method)
 */
public class MethodTargetAttribute extends Attribute
{
} //MethodTargetAttribute

// This attribute is only valid on a constructor.
/** @attribute AttributeUsage(AttributeTargets.Constructor)
 */
public class ConstructorTargetAttribute extends Attribute
{
} //ConstructorTargetAttribute

// This attribute is only valid on a field.
/** @attribute AttributeUsage(AttributeTargets.Field)
 */
public class FieldTargetAttribute extends Attribute
{
} //FieldTargetAttribute

// This attribute is valid on a class or a method.
/** @attribute AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)
 */
public class ClassMethodTargetAttribute extends Attribute
{
} //ClassMethodTargetAttribute

// This attribute is valid on any target.
/** @attribute AttributeUsage(AttributeTargets.All)
 */
public class AllTargetsAttribute extends Attribute
{
} //AllTargetsAttribute

/** @attribute ClassTarget()
 */
/** @attribute ClassMethodTarget()
 */
/** @attribute AllTargets()
 */
public class TestClassAttribute
{
    /** @attribute.ConstructorTarget ConstructorTarget()
     */
    /** @attribute AllTargets()
     */
    TestClassAttribute()
    {
    } //TestClassAttribute

    /** @attribute MethodTarget()
     */
    /** @attribute ClassMethodTarget()
     */
    /** @attribute AllTargets()
     */
    public void Method1()
    {
    } //Method1

    /** @attribute FieldTarget()
     */
    /** @attribute AllTargets()
     */
    public int myInt;

    public static void main(String[] args)
    {
    } //main
} //TestClassAttribute

JScript

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import System;

package AttTargsJS {
	// This attribute is only valid on a class.
	AttributeUsage(AttributeTargets.Class)
	public class ClassTargetAttribute extends Attribute {
	}

	// This attribute is only valid on a method.
	AttributeUsage(AttributeTargets.Method)
	public class MethodTargetAttribute extends Attribute {
	}

	// This attribute is only valid on a constructor.
	AttributeUsage(AttributeTargets.Constructor)
	public class ConstructorTargetAttribute extends Attribute {
	}

	// This attribute is only valid on a field.
	AttributeUsage(AttributeTargets.Field)
	public class FieldTargetAttribute extends Attribute {
	}

	// This attribute is valid on a class or a method.
	AttributeUsage(AttributeTargets.Class|AttributeTargets.Method)
	public class ClassMethodTargetAttribute extends Attribute {
	}

	// This attribute is valid on any target.
	AttributeUsage(AttributeTargets.All)
	public class AllTargetsAttribute extends Attribute {
	}

	ClassTargetAttribute
        ClassMethodTargetAttribute
        AllTargetsAttribute
	public class TestClassAttribute {
		ConstructorTargetAttribute
		AllTargetsAttribute
		function TestClassAttribute() {
		}

		MethodTargetAttribute
                ClassMethodTargetAttribute
                AllTargetsAttribute
		public function Method1() {
		}

		FieldTargetAttribute
                AllTargetsAttribute
		public var myInt : int;

		static function Main(args : String[]) {
		}
	}
}

Platforms

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

Version Information

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

Reference

System Namespace
AttributeUsageAttribute

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