Finding out if a type implements a generic interface

Question

Let\'s say I have a type, MyType. I want to do the following:

1. Find out if MyType implements the IList interface, for some T.
2. If the answer to (1) is y

Answer 1

As a helper method extension

public static bool Implements(this Type type, I @interface) where I : class  
{
    if(((@interface as Type)==null) || !(@interface as Type).IsInterface)
        throw new ArgumentException("Only interfaces can be 'implemented'.");

    return (@interface as Type).IsAssignableFrom(type);
}

example usage:

var testObject = new Dictionary();
result = testObject.GetType().Implements(typeof(IDictionary)); // true!