Compare closed type with open type

Question

I'm curious how to check if given type is closed version of open type. For instance

public bool IsGenericList(Type source)
{
    return (source.IsGenericType &&
            /*here goes the manipulation on source type*/ == typeof(List<>));
}

Answer 1

Try Type.GetGenericTypeDefinition:

public bool IsGenericList(Type source)
{
    return source.IsGenericType &&
           source.GetGenericTypeDefinition() == typeof(List<>);
}