Why Can't I Embed Interop Types in My .NET 4.0 Application?

Troubleshooting Interop Type Embedding in .NET 4.0 Applications

.NET 4.0 applications interacting with COM objects via interop assemblies may encounter the error: "Interop type 'ActiveHomeScriptLib.ActiveHomeClass' cannot be embedded. Use the applicable interface instead." This problem doesn't occur in .NET 3.5. This explanation clarifies interop types and provides solutions.

Understanding Interop Types

Interop types—classes or interfaces—bridge the gap between .NET and native COM objects. They provide access to COM component functionality without requiring complex C coding.

Why Embedding Fails in .NET 4.0

.NET 4.0 allows embedding primary interop assemblies (PIAs) directly into the main application assembly, eliminating the need for separate PIA deployment. However, certain interop types might be unsuitable for embedding due to factors like size, stability, or compatibility issues with other components.

Resolving the Embedding Problem

These steps can resolve the "Interop type cannot be embedded" error:

• Prevent Type Embedding: In Visual Studio, locate the problematic assembly's Properties. Change the "Embed Interop Types" setting to "False." This stops the type from being embedded.
• Remove the "Class" Suffix (If Applicable): As suggested by Michael Gustus, removing the "Class" suffix from the type name might work. For instance, use "ActiveHomeScriptLib.ActiveHome" instead of "ActiveHomeScriptLib.ActiveHomeClass."

These solutions enable successful interop assembly usage in your .NET 4.0 applications, avoiding the embedding error.

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