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Advanced COM Interoperability

The .NET Framework is a natural progression from COM because the two models share many central themes, including component reuse and language neutrality. For backward compatibility, COM interop provides access to existing COM components without requiring that the original component be modified. You can incorporate COM components into a .NET Framework application by using COM interop tools to import the relevant COM types. Once imported, the COM types are ready to use.

COM interop also introduces forward compatibility by enabling your COM clients to access managed code as easily as they access other COM objects. Again, COM interop provides the means to seamlessly export metadata in an assembly to a type library and registers the managed component as a traditional COM component. Both the import and export utilities produce results consistent with COM specifications. At run time, the common language runtime marshals data between COM objects and managed objects as needed.

Advanced COM Interoperability How-to Topics

Provides links to all How-to topics found in the conceptual documentation for advanced COM interoperability.

COM Wrappers

Describes the wrappers provided by COM interop.

Type Equivalence and Embedded Interop Types

Describes how type information for COM types is embedded in assemblies, and how the common language runtime determines the equivalence of embedded COM types.

Primary Interop Assemblies

Describes how to create and use primary interop assemblies.

Side-by-Side Execution for COM Interop

Describes how to safely share components through COM interop services.

Registration-Free COM Interop

Describes how COM interop can activate components without using the Windows registry.

Safe Handles and Critical Finalization

Describes classes used to safely wrap unmanaged handles in managed code.

Inheritance, Aggregation, and Containment

Describes various strategies for extending COM types.

Managed and Unmanaged Threading

Describes the threading differences that impact interoperation.

Managed and Unmanaged Events

Describes how to raise and handle events using COM interop.

Type Library to Assembly Conversion Summary

Describes the type library to assembly import conversion process.

Assembly to Type Library Conversion Summary

Describes the assembly to type library export conversion process.

Custom Marshaling

Describes the process for writing a custom marshaler for interoperation.

Wrapping Delegates and Unmanaged Function Pointers

Provides information about the methods used to marshal function pointers between managed and unmanaged code.

Design Considerations for Interoperation

Provides design-time considerations that can enhance the transition between managed and unmanaged code.

Exposing COM Components to the .NET Framework

Describes how to expose an existing COM component to managed code.

Exposing .NET Framework Components to COM

Describes how to expose managed code to an existing COM component.

Interop Marshaling

Describes the process that governs how data is passed between managed and unmanaged code.

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