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RegistrationServices.RegisterTypeForComClients Method (Type, RegistrationClassContext, RegistrationConnectionType)

Registers the specified type with COM using the specified execution context and connection type.

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

public virtual int RegisterTypeForComClients(
	Type type,
	RegistrationClassContext classContext,
	RegistrationConnectionType flags


Type: System.Type
The Type object to register for use from COM.
Type: System.Runtime.InteropServices.RegistrationClassContext
One of the RegistrationClassContext values that indicates the context in which the executable code will be run.
Type: System.Runtime.InteropServices.RegistrationConnectionType
One of the RegistrationConnectionType values that specifies how connections are made to the class object.

Return Value

Type: System.Int32
An integer that represents a cookie value.


The type parameter is null.


The type parameter cannot be created.

This method is equivalent to calling CoRegisterClassObject in COM. The RegisterTypeForComClients method is not atomic and can cause unpredictable results when used in a multithreaded context.

In the .NET Framework version 2.0 and later, use the UnregisterTypeForComClients method to unregister a type in COM.

Note that using platform invoke to call the unmanaged CoRegisterClassObject and CoDisconnectObject methods for registration and unregistration of COM objects is not supported.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.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.