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)]
public sealed class ComUnregisterFunctionAttribute : Attribute
[AttributeUsageAttribute(AttributeTargets::Method, Inherited = false)]
public ref class ComUnregisterFunctionAttribute sealed : Attribute
[<AttributeUsageAttribute(AttributeTargets.Method, Inherited = false)>]
type ComUnregisterFunctionAttribute = 
        inherit Attribute
<AttributeUsageAttribute(AttributeTargets.Method, Inherited := False)>
Public NotInheritable Class ComUnregisterFunctionAttribute
	Inherits Attribute
System_CAPS_pubmethod ComUnregisterFunctionAttribute

Initializes a new instance of the ComUnregisterFunctionAttribute class.


When implemented in a derived class, gets a unique identifier for this Attribute.(Inherited from Attribute.)

System_CAPS_pubmethod Equals

This API supports the product infrastructure and is not intended to be used directly from your code. Returns a value that indicates whether this instance is equal to a specified object.(Inherited from Attribute.)

System_CAPS_pubmethod GetHashCode

Returns the hash code for this instance.(Inherited from Attribute.)

System_CAPS_pubmethod GetType

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethod IsDefaultAttribute

When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.(Inherited from Attribute.)

System_CAPS_pubmethod Match

When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.)

System_CAPS_pubmethod ToString

Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetIDsOfNames

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetTypeInfo

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetTypeInfoCount

Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeInvoke

Provides access to properties and methods exposed by an object.(Inherited from 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 Regasm.exe (Assembly Registration Tool) or through the RegistrationServicesUnregisterAssembly 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
   public static void RegisterFunction(Type t)
      //Insert code here.

   public static void UnregisterFunction(Type t)
      //Insert code here.
Imports System
Imports System.Runtime.InteropServices

Public Class MyClassThatNeedsToRegister

    <ComRegisterFunctionAttribute()> Public Shared Sub _
      RegisterFunction(t As Type)
        'Insert code here.
    End Sub

    <ComUnregisterFunctionAttribute()> Public Shared Sub _
      UnregisterFunction(t As Type)
        'Insert code here.
    End Sub
End Class
using namespace System;
using namespace System::Runtime::InteropServices;
public ref class MyClassThatNeedsToRegister

   static void RegisterFunction( Type^ t )

      //Insert code here.

   static void UnregisterFunction( Type^ t )

      //Insert code here.

.NET Framework
Available since 1.1

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

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