external - How to add a class to a dll without recompiling the dll? -

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how add class dll without recompiling dll?

i have library i'm using, , don't have source code.

i not touch library able add new classes library.

is possible?

i create new dll whatever classes , functions need, can write them extension methods , appear if in same namespace. have add additional reference dll projects use existing library or use "ilmerge" merge dll's.


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