What is the difference between typeof and the is keyword?

Question

What's the exact difference between the two?

// When calling this method with GetByType<MyClass>()  public bool GetByType<T>() {     // this returns true:     return typeof(T).Equals(typeof(MyClass));      // this returns false:     return typeof(T) is MyClass; } 

Answer 1

You should use is AClass on instances and not to compare types:

var myInstance = new AClass(); var isit = myInstance is AClass; //true 

is works also with base-classes and interfaces:

MemoryStream stream = new MemoryStream();  bool isStream = stream is Stream; //true bool isIDispo = stream is IDisposable; //true 

Answer 2

The is keyword checks if an object is of a certain type. typeof(T) is of type Type, and not of type AClass.

Check the MSDN for the is keyword and the typeof keyword