Why Does My .NET 4.0 Application Fail to Embed Interop Types from ActiveHomeScriptLib?

.NET Interop Type Embedding: A Troubleshooting Guide

The Problem:

Developers often encounter the frustrating ".NET Interop type cannot be embedded" error when working with the ActiveHomeScriptLib assembly in .NET 4.0 applications. This issue is notably absent when using .NET 3.5.

Understanding Interop Type Embedding:

.NET 4.0 introduces the capability to embed primary interop assemblies directly into application assemblies. This simplifies deployment by eliminating the need for separate interop DLLs.

Why the Error Occurs:

The ActiveHomeScriptLib assembly is incompatible with the embedding mechanism in .NET 4.0.

The Solution:

To fix this, follow these steps:

1. In Visual Studio 2010, access the Properties window for the ActiveHomeScriptLib reference.
2. Change the "Embed Interop Types" property to "False".

Another potential solution, as suggested by Michael Gustus, involves removing the "Class" suffix from any affected types within your code. This may resolve the embedding conflict.

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