How to tell if an instance is of a certain Type or any derived types

Question

I'm trying to write a validation to check that an Object instance can be cast to a variable Type. I have a Type instance for the type of object they need to provide. But the Type can vary. This is basically what I want to do.

        Object obj = new object();
        Type typ = typeof(string); //just a sample, really typ is a variable

        if(obj is typ) //this is wrong "is" does not work like this
        {
            //do something
        }

The type object itself has the IsSubClassOf, and IsInstanceOfType methods. But what I really want to check is if obj is either an instance of typ or any class derived from typ.

Seems like a simple question, but I can't seem to figure it out.

Answer 1

How about this:

    MyObject myObject = new MyObject();
    Type type = myObject.GetType();

    if(typeof(YourBaseObject).IsAssignableFrom(type))
    {  
       //Do your casting.
       YourBaseObject baseobject = (YourBaseObject)myObject;
    }  

This tells you if that object can be casted to that certain type.