Question

The output of the below code is as following:

not equal
equal

Note the difference in type of x and xx and that == operator overload is only executed in the second case and not in the first.

Is there a way I can overload the == operator so that its always executed when a comparison is done on between MyDataObejct instances.

Edit 1:# here i want to override the == operator on MyDataClass , I am not sure how I can do it so that case1 also executes overloaded == implementation.

class Program {     static void Main(string[] args) {         // CASE 1         Object x = new MyDataClass();         Object y = new MyDataClass();         if ( x == y ) {             Console.WriteLine('equal');         } else {             Console.WriteLine('not equal');         }          // CASE 2          MyDataClass xx = new MyDataClass();         MyDataClass yy = new MyDataClass();         if (xx == yy) {             Console.WriteLine('equal');         } else {             Console.WriteLine('not equal');         }     } }  public class MyDataClass {     private int x = 5;      public static bool operator ==(MyDataClass a, MyDataClass b) {         return a.x == b.x;     }      public static bool operator !=(MyDataClass a, MyDataClass b) {         return !(a == b);     } } 

Answer 1

No, basically. == uses static analysis, so will use the object ==. It sounds like you need to use object.Equals(x,y) instead (or x.Equals(y) if you know that neither is null), which uses polymorphism.