Cost of .net dynamic proxies?

The opensource Impromptu-Interface requires c# 4.0, and creates a lightweight proxy type for each Interface and Implementation Type combo you use and keeps them cached.

Looks like you need more of a stub rather than a dynamic proxy. Perhaps you might want to take a look at Moq. As far as I know it creates a different instance for every time you create a mock, don't know if internally keeps some sort of a Type cache, though.

Mind you, as it's a library targeted for unit tests, so this kind of use would be probably unorthodox.

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