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ComUnregisterFunctionAttribute Class

Specifies the method to call when you unregister an assembly for use from COM; this allows for the execution of user-written code during the unregistration process.

Namespace:  System.Runtime.InteropServices
Assembly:  mscorlib (in mscorlib.dll)

[AttributeUsageAttribute(AttributeTargets.Method, Inherited = false)]
[ComVisibleAttribute(true)]
public sealed class ComUnregisterFunctionAttribute : Attribute

You can apply this attribute to methods.

ComUnregisterFunctionAttribute enables you to add code that reverses the operations performed by a registration method. If you apply the ComRegisterFunctionAttribute to provide a registration method, you must also provide an unregistration method to reverse the operations done in the registration method. You can have only one unregistration method for a class.

The common language runtime calls the method with this attribute when its containing assembly is unregistered (directly or indirectly) with the Assembly Registration Tool (Regasm.exe) or through the RegistrationServices.UnregisterAssembly API method. Methods with this attribute can have any visibility (public, private, and so on), but must be static and must take a single Type parameter for the Type to unregister.

The following example demonstrates applying ComRegisterFunctionAttribute and ComUnregisterFunctionAttribute to methods with the appropriate signature.

using System;
using System.Runtime.InteropServices;

public class MyClassThatNeedsToRegister
{
   [ComRegisterFunctionAttribute]
   public static void RegisterFunction(Type t)
   {
      //Insert code here.
   }

   [ComUnregisterFunctionAttribute]
   public static void UnregisterFunction(Type t)
   {
      //Insert code here.
   }
}

System.Object
  System.Attribute
    System.Runtime.InteropServices.ComUnregisterFunctionAttribute

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

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

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