Why Does My TypeLoadException Show 'No Implementation' Even Though the Method Exists?

TypeLoadException Error: Method Missing Implementation Despite Existence

Encountering a System.TypeLoadException stating that a method (e.g., 'SetShort') in a type (e.g., 'DummyItem') lacks an implementation, even though the method exists, is a common problem stemming from assembly version mismatches.

This often occurs when a class implements an interface from a separate assembly. If you add the method to both the interface and the implementing class, but recompile the implementing assembly without updating the reference to the newer interface assembly, the compiler sees the method in the class, but the runtime can't find the correct interface definition. The method exists, but the link is broken.

The solution is a complete rebuild. Clean your project's bin and obj folders thoroughly, and then rebuild your entire solution. This forces a refresh of all assembly references, ensuring that each assembly uses the correct, updated versions of its dependencies, resolving the version conflict.

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