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Dictionary refactoring, key type change

I am refactoring a C # library using Dictionary<int, SomeInterface>the whole system. I need to change the key type from int to string and use it instead Dictionary<string, SomeInterface>, and I make dozens of changes. How to do it better, how to define a type in one place and use it everywhere, so if I need to change it later, can I change it in one place?

I have already added the GetKey () method to my interface.

Edit: The library is used in other DLLs, and I want to limit the possible changes to only one library. This is a nimble store, so we must be prepared for change.

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, , .

, public class Key { public Key(object adaptee) { ... } }

Equals() GetHashCode() .

, , , Resharper - , .

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