ExtensionAttribute Class (System.Runtime.CompilerServices)

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.NET Framework Class Library

ExtensionAttribute Class

Updated: November 2007

This API supports the .NET Framework infrastructure and is not intended to be used directly from your code.

Indicates that a method is an extension method, or that a class or assembly contains extension methods.

Namespace: System.Runtime.CompilerServices
Assembly: System.Core (in System.Core.dll)

Syntax

Visual Basic (Declaration)

<AttributeUsageAttribute(AttributeTargets.Assembly Or AttributeTargets.Class Or AttributeTargets.Method)> _
Public NotInheritable Class ExtensionAttribute _
    Inherits Attribute

Visual Basic (Usage)

Dim instance As ExtensionAttribute

[AttributeUsageAttribute(AttributeTargets.Assembly|AttributeTargets.Class|AttributeTargets.Method)]
public sealed class ExtensionAttribute : Attribute

Visual C++

[AttributeUsageAttribute(AttributeTargets::Assembly|AttributeTargets::Class|AttributeTargets::Method)]
public ref class ExtensionAttribute sealed : public Attribute

/** @attribute AttributeUsageAttribute(AttributeTargets.Assembly|AttributeTargets.Class|AttributeTargets.Method) */
public final class ExtensionAttribute extends Attribute

JScript

public final class ExtensionAttribute extends Attribute

Remarks

If you are writing a compiler that supports extension methods, your compiler should emit this attribute on each extension method and on each class and assembly that contains one or more extension methods.

Inheritance Hierarchy

System..::.Object
System..::.Attribute
System.Runtime.CompilerServices..::.ExtensionAttribute

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Platforms

Windows Vista, Windows XP SP2, Windows Server 2003, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

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

Version Information