COM Interop

COM Interop

COM Interop is a technology included in the .NET CLR that enables COM objects to interact with .NET objects, and vice versa.

COM Interop aims to provide access to the existing COM components without requiring that the original component be modified. It tries to make the .NET types equivalent to the COM types. In addition, COM Interop allows COM developers to access managed objects as easily as they access other COM objects.

The .NET Framework creates a type library and special registry entries when a component is registered. It provides a specialized utility (RegAsm.exe , usually located in C:\Windows\Microsoft.NET\Framework) that exports the managed types into a type library and registers the managed component as a traditional COM component. When the type is instantiated through COM, the .NET CLR is the actual COM object that executes and it merely marshals any method calls or property access to the type implementation.

A COM Interop for an existing COM component can be created through the use of the Tlbimp.exe tool supplied with the .NET Framework SDK. This tool will create a set of proxy classes implemented in CIL which is encapsulated in an Assembly.


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