mono/mcs/class/System.Core/Documentation/en/System.Runtime.CompilerServices/ExtensionAttribute.xml

<?xml version="1.0" encoding="utf-8"?>
<Type Name="ExtensionAttribute" FullName="System.Runtime.CompilerServices.ExtensionAttribute">
  <TypeSignature Language="C#" Value="public sealed class ExtensionAttribute : Attribute" />
  <AssemblyInfo>
    <AssemblyName>System.Core</AssemblyName>
    <AssemblyVersion>3.5.0.0</AssemblyVersion>
  </AssemblyInfo>
  <Base>
    <BaseTypeName>System.Attribute</BaseTypeName>
  </Base>
  <Interfaces />
  <Attributes>
    <Attribute>
      <AttributeName>System.AttributeUsage(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Method)</AttributeName>
    </Attribute>
  </Attributes>
  <Docs>
    <remarks>
      <attribution license="cc4" from="Microsoft" modified="false" />
      <para>In Visual Basic, you should use this attribute to create an extension method. For more information, see <format type="text/html"><a href="b8020aae-374d-46a9-bcb7-8cc2390b93b6">Extension Methods (Visual Basic)</a></format>.</para>
      <para>In C#, you do not need to use this attribute; you should use the <format type="text/html"><a href="d4f827fe-4710-410b-89b8-867dad44b8a3">this (C# Reference)</a></format> modifier for the first parameter to create an extension method. The compiler automatically emits ExtensionAttribute for extension methods. For more information, see <format type="text/html"><a href="175ce3ff-9bbf-4e64-8421-faeb81a0bb51">Extension Methods (C# Programming Guide)</a></format>.</para>
      <para>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.</para>
    </remarks>
    <summary>
      <attribution license="cc4" from="Microsoft" modified="false" />
      <para>Indicates that a method is an extension method, or that a class or assembly contains extension methods.</para>
    </summary>
  </Docs>
  <Members>
    <Member MemberName=".ctor">
      <MemberSignature Language="C#" Value="public ExtensionAttribute ();" />
      <MemberType>Constructor</MemberType>
      <AssemblyInfo>
        <AssemblyVersion>3.5.0.0</AssemblyVersion>
      </AssemblyInfo>
      <Parameters />
      <Docs>
        <remarks>To be added.</remarks>
        <summary>
          <attribution license="cc4" from="Microsoft" modified="false" />
          <para>Initializes a new instance of the <see cref="T:System.Runtime.CompilerServices.ExtensionAttribute" /> class. </para>
        </summary>
      </Docs>
    </Member>
  </Members>
</Type>