Why ReferenceEquals and == operator behave different from Equals

Question

I have an Entity that doesn\'t override any of the equality members\\operators.
When comparing two proxies of them (I got them from the Nhibernate session)

Answer 1

Edit

You might be using a struct? See below

---

I suppose reference types show the behaviour you expect:

public class Program    {
    class X { int x,y; }    
    public static void Main(string[] args)
    {
        X a = new X();
        X b = new X();
        System.Console.WriteLine(a == b);
        System.Console.WriteLine(a.Equals(b));
        System.Console.WriteLine(Equals(a,b));
        System.Console.WriteLine(ReferenceEquals(a,b));
} }

Prints:

False
False
False
False

For structs, things are different (commeting out the a==b test, which doesn't compile for structs:)

public class Program {
    struct X { int x,y; }
    public static void Main(string[] args)
    {
        X a = new X();
        X b = new X();
        //System.Console.WriteLine(a == b);
        System.Console.WriteLine(a.Equals(b));
        System.Console.WriteLine(Equals(a,b));
        System.Console.WriteLine(ReferenceEquals(a,b));
} }

Output:

True
True
False

Rationale:

The default implementation of Equals() comes from class ValueType, which is implicit base class of all value types. You may override this implementation by defining your own Equals() method in your struct. ValueType.Equals() always returns false when one compares objects of different (dynamic) types. If objects are of the same type, it compares them by calling Equals() for each field. If any of these returns false, the whole process is stopped, and final result is false. If all field-by-field comparisons return true, final result is true