In C#, how do I check if a type is a subtype OR the type of an object?

Question

To check if a type is a subclass of another type in C#, it's easy:

typeof (SubClass).IsSubclassOf(typeof (BaseClass)); // returns true

However, this will fail:

typeof (BaseClass).IsSubclassOf(typeof (BaseClass)); // returns false

Is there any way to check whether a type is either a subclass OR of the base class itself, without using an OR operator or using an extension method?

Answer 1

typeof(BaseClass).IsAssignableFrom(unknownType);

Answer 2

You should try using Type.IsAssignableFrom instead.

Answer 3

Use this:

if (typeof(BaseClass).IsAssignableFrom(typeof(SubClass)))

Note that you reverse the order of the classes compared to the code you have in your question.

Link: Type.IsAssignableFrom Method.