ComRegisterFunctionAttribute Class


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

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


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


Initializes a new instance of the ComRegisterFunctionAttribute class.


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


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.)


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


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


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


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


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

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

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

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

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


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

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

Provides access to properties and methods exposed by an object.(Inherited from Attribute.)

You can apply this attribute to methods.

ComRegisterFunctionAttribute enables you to add arbitrary registration code to accommodate the requirements of COM clients. For example, you can update the registry using registration functions from the Microsoft.Win32 namespace. If you provide a registration method, you must also apply System.Runtime.InteropServices.ComUnregisterFunctionAttribute to an unregistration method, which reverses the operations done in the registration method.

The common language runtime calls the method with this attribute when its containing assembly is registered (directly or indirectly) with the Regasm.exe (Assembly Registration Tool)or through the RegistrationServices.RegisterAssembly method.

This attribute can be applied only to methods that have the following characteristics:

  • Scope: Any (public, private, and so on).

  • Type: static.

  • Parameters: Accepts a single Type parameter or a String parameter type.

  • Return type: void.

The following example demonstrates how to apply 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.

.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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