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RegistrationServices.RegisterAssembly Method

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

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

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.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

  • SecurityCriticalAttribute 

    requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.