Using the `is` operator with Generics in C#

Question

I want to do something like this

class SomeClass<T>
{
   SomeClass()
   {
        bool IsInterface = T is ISomeInterface;
   }
}

What is the best way to something like this?

Note: I am not looking to constrain T with a where, but I would like my code to be aware of what types of interfaces T implements. I would prefer that I dont have to construct a T.

Answer 1

I don't think you can use the is operator for this. But you can use IsAssignableFrom:

bool IsInterface = typeof(ISomeInterface).IsAssignableFrom(typeof(T));

Answer 2

I believe the best you can do it:

bool IsInterface = typeof(ISomeInterface).IsAssignableFrom(typeof(T));

Answer 3

You could try doing something like

Type Ttype = typeof(T);

That will give you the full power of the Type class, which has functions like "FindInterfaces".

Answer 4

You can use IsAssignableFrom:

  class SomeClass<T>
  {
     SomeClass()
     {
        bool IsIComparable = typeof(IComparable).IsAssignableFrom(typeof(T));
     }
  } 

Answer 5

bool IsInterface = typeof(ISomeInterface).IsAssignableFrom(typeof(T))