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For either List with n elements, which (if any) requires more storage on x64 machine:
List<int>
-or-
List<long>
I guess the question can be rephrased as:
On x64, does an int take any less space than a long?
The
intkeyword is an alias for theSystem.Int32type which is always 32 bits wide, regardless of platform. Likewise, thelongkeyword is an alias for theSystem.Int64type which is always 64 bits wide, regardless of platform.