问题
I understand T comes from Type, but why is it that the next variable often used is K?
回答1:
I've seen K used for Key but not frequently as the "next" type parameter. For example, you'll see
Dictionary<K, V>
where K is for Key and V is for Value.
Sometimes you'll see T1, T2, etc. or T, U, V (the former is preferred here). But I prefer more descriptive names like
Map<TSource, TDestination>
or
Create<TUnitOfWork>
回答2:
My guess would be that it's from Key.
回答3:
One more variation is the GenericFunction<T1,T2,TResult>, where TResult is the type of value returned by the functon. (as in, Func<T1,T2,...,TResult>)
来源：https://stackoverflow.com/questions/4367939/where-does-the-c-sharp-generics-naming-convention-come-from