Why Does Switching to .NET 3.5 Fix the 'Interop Type Cannot Be Embedded' Error?

Resolving ".NET Interop Type" Errors by Adjusting Framework Settings

During .NET 4.0 development, a developer encountered the error "Interop type 'ActiveHomeScriptLib.ActiveHomeClass' cannot be embedded. Use the applicable interface instead" when using the "ActiveHomeScriptLib" assembly. Switching to the .NET 3.5 framework resolved the problem. Let's examine why.

Understanding Interop Types

Interop types facilitate communication between managed code (like C#) and unmanaged code (such as C ). They act as bridges between different programming languages and environments.

Why the Error Occurs in .NET 4.0?

.NET 4.0 introduced the capability to embed primary interop assemblies directly into the application, eliminating separate deployment. However, some assemblies aren't suitable for embedding. The "ActiveHomeScriptLib" assembly was one such example.

The Solution: Disabling Interop Type Embedding

To fix this, modify the assembly settings:

1. In Visual Studio 2010, open the Properties window for the "ActiveHomeScriptLib" assembly.
2. Locate the "Embed Interop Types" property.
3. Change this property from "True" to "False".

This prevents interop type embedding, resolving the error and enabling the application to function correctly.

The above is the detailed content of Why Does Switching to .NET 3.5 Fix the 'Interop Type Cannot Be Embedded' Error?. For more information, please follow other related articles on the PHP Chinese website!