Question

I need to detect whether an object of type IDictionary<string, string> is an IDictionary<,> and I’m having trouble coming up with the proper comparison logic.

I have tried the following:

typeof(IDictionary<string, string>)
       .GetInterface(typeof(IDictionary<,>).Name);

and

typeof(IDictionary<string, string>)
       .GetGenericTypeDefinition()
       .GetInterface(typeof(IDictionary<,>).Name);

Calling typeof(Dictionary<string,string>).GetInterface(comparisonType.Name) returns the expected non-null result, but if I compare on the IDictionary<string,string> type, GetInterface() returns null. Likewise, comparing on the GenericTypeDefinition also returns null.

Answer 1

typeof(IDictionary<string, string>).GetGenericTypeDefinition() == typeof(IDictionary<,>)