Question

I need to do a comparaison between an object and NULL. When the object is not NULL I fill it with some data.

Here is the code :

 if (region != null)  {   ....  } 

This is working but when looping and looping sometime the region object is NOT null (I can see data inside it in debug mode). In step-by-step when debugging, it doesn’t go inside the IF statement… When I do a Quick Watch with these following expression : I see the (region == null) return false, AND (region != null) return false too… why and how?

Update

Someone point out that the object was == and != overloaded:

    public static bool operator ==(Region r1, Region r2)     {         if (object.ReferenceEquals(r1, null))         {             return false;         }         if (object.ReferenceEquals(r2, null))         {             return false;         }          return (r1.Cmr.CompareTo(r2.Cmr) == 0 && r1.Id == r2.Id);     }       public static bool operator !=(Region r1, Region r2)     {         if (object.ReferenceEquals(r1, null))         {             return false;         }         if (object.ReferenceEquals(r2, null))         {             return false;         }         return (r1.Cmr.CompareTo(r2.Cmr) != 0 || r1.Id != r2.Id);     } 

Answer 1

Is the == and/or != operator overloaded for the region object’s class?

Now that you’ve posted the code for the overloads:

The overloads should probably look like the following (code taken from postings made by Jon Skeet and Philip Rieck):

public static bool operator ==(Region r1, Region r2) {     if (object.ReferenceEquals( r1, r2)) {         // handles if both are null as well as object identity         return true;     }      if ((object)r1 == null || (object)r2 == null)     {        return false;     }              return (r1.Cmr.CompareTo(r2.Cmr) == 0 && r1.Id == r2.Id); }  public static bool operator !=(Region r1, Region r2) {     return !(r1 == r2); }