Is it possible to see if an object inherits IDictionary without generic type parameters?

Question

I am testing object like this:

if (item is IDictionary<object, object>)

But that doesn't match all of the other combination of types <sting, object>, <int, string> etc...

I just want to know if it has implemented the interface regardless of what generic types it is using.

I found an example that said it was possible doing something like:

dictionary.GetType().GetInterfaces().Any(x => x.GetGenericTypeDefinition == typeof(IDictionary<>));

But I still have to specify the type signature or it is not valid.

Is it possible to make a statement that checks the interface without having to specify the type?

Answer 1

You are close, you really just need to fix up the syntax:

dictionary.GetType().GetInterfaces().Any(x => x.GetGenericTypeDefinition() == typeof(IDictionary<,>))

Note the () after GetGenericTypeDefinition, and the comma inside of the <>.