Why Can't I Embed Interop Type 'ActiveHomeScriptLib.ActiveHomeClass' in My .NET 4.0 Application?

.NET 4.0 Interop Type Embedding Problems

Developers working with the "ActiveHomeScriptLib" assembly in .NET 4.0 may encounter the error: "Interop type 'ActiveHomeScriptLib.ActiveHomeClass' cannot be embedded. Use the applicable interface instead." This problem doesn't appear in .NET 3.5.

Understanding Interop Assemblies

Interop assemblies bridge the gap between managed (.NET) code and unmanaged COM (Component Object Model) components. They enable communication between these disparate environments.

Root Cause

.NET 4.0 allows embedding primary interop assemblies (PIAs) directly into your application, avoiding separate deployment. However, not all assemblies are suitable for embedding. The "ActiveHomeScriptLib" assembly is one such example.

Resolution

The solution involves preventing the embedding of interop types. In Visual Studio 2010, locate the Properties window for the "ActiveHomeScriptLib" assembly reference and set the "Embed Interop Types" property to "False."

Further Considerations

As noted by Michael Gustus, removing the ".Class" suffix from the relevant types might also resolve the error.

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