Trivial C# class with a generic parameter wouldn't compile for no apparent reason

Question

I want a generic function that would work with types that have Top, Bottom, Right and Rect read-only properties - I have

Answer 1

Generics is used for type safety. Now without any additional info about WhatType, how would the compiler know that the instance what that gets passed in will have a property Left?

You need something like this

public interface IFoo
{
    int Left {get;}
}

and

internal class MyTemplate where WhatType : IFoo {