TypeLoadException: 'No Implementation' Despite Method Existence – What's Wrong?

TypeLoadException: Method Defined, but Implementation Missing

A TypeLoadException indicating a missing method implementation, even when the method exists, is often caused by assembly version conflicts. This guide outlines troubleshooting steps.

Investigating Assemblies

The problem usually stems from inconsistent assembly versions. Verify all related assemblies, including the one containing the problematic method, use the latest versions of their dependencies.

Interfaces and Implementations

If the method is part of an interface, confirm the implementation assembly references the most up-to-date interface definition. Failing to rebuild the implementation after interface updates frequently leads to this error.

Illustrative Scenario

Imagine this:

1. InterfaceDef assembly defines an interface with a SetShort method.
2. Implementation assembly implements SetShort but uses an older InterfaceDef version.
3. Rebuilding Implementation doesn't recognize the updated SetShort due to version mismatch.

Solution

To fix this, remove all bin and obj folders from all involved assemblies. Then, rebuild the entire solution. This forces a clean rebuild, ensuring all assemblies utilize the correct dependency versions, thus resolving the "no implementation" error.

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