RegisterAssembly Method

RegistrationServices.RegisterAssembly Method

Registers the classes in a managed assembly to enable creation from COM.

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

[SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
public virtual bool RegisterAssembly(
	Assembly assembly,
	AssemblyRegistrationFlags flags


Type: System.Reflection.Assembly

The assembly to be registered.

Type: System.Runtime.InteropServices.AssemblyRegistrationFlags

An AssemblyRegistrationFlags value indicating any special settings used when registering assembly.

Return Value

Type: System.Boolean
true if assembly contains types that were successfully registered; otherwise false if the assembly contains no eligible types.


IRegistrationServices.RegisterAssembly(Assembly, AssemblyRegistrationFlags)


assembly is null.


The full name of assembly is null.


A method marked with ComRegisterFunctionAttribute is not static.


There is more than one method marked with ComRegisterFunctionAttribute at a given level of the hierarchy.


The signature of the method marked with ComRegisterFunctionAttribute is not valid.


A user-defined custom registration function (marked with the ComRegisterFunctionAttribute attribute) throws an exception.

RegisterAssembly adds the appropriate registry entries for the types in the specified assembly. This method also calls any registration functions found in the assembly.

Use Assembly.Load to get an assembly.

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

Community Additions

© 2016 Microsoft