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Asked: 2026-05-10T18:52:17+00:00

If an interface inherits IEquatable the implementing class can define the behavior of the

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If an interface inherits IEquatable the implementing class can define the behavior of the Equals method. Is it possible to define the behavior of == operations?

public interface IFoo : IEquatable   {}    public class Foo : IFoo   {       // IEquatable.Equals       public bool Equals(IFoo other)       {           // Compare by value here...     }   }

To check that two IFoo references are equal by comparing their values: 

IFoo X = new Foo();   IFoo Y = new Foo();  if (X.Equals(Y))   {        // Do something   }

Is it possible to make if (X == Y) use the Equals method on Foo?

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1 Answer

  1. No – you can’t specify operators in interfaces (mostly because operators are static). The compiler determines which overload of == to call based purely on their static type (i.e. polymorphism isn’t involved) and interfaces can’t specify the code to say ‘return the result of calling X.Equals(Y)’.

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