Why do 2 delegate instances return the same hashcode?

Question

Take the following:

  var x =  new Action(() => { Console.Write(\"\") ; });
  var y = new Action(() => { });
  var a = x.GetHashCode();
  var b = y.GetHash         


        

Answer 1

From MSDN :

The default implementation of GetHashCode does not guarantee uniqueness or consistency; therefore, it must not be used as a unique object identifier for hashing purposes. Derived classes must override GetHashCode with an implementation that returns a unique hash code. For best results, the hash code must be based on the value of an instance field or property, instead of a static field or property.

So if you have not overwritten the GetHashCode method, it may return the same. I suspect this is because it generates it from the definition, not the instance.