Comparing Custom Objects in C#

Once again I found myself trying to remember the specifics of how to compare specific attributes of a custom object when doing an Array Sort. The linked MS kb article has the specifics, but I'll copy some of that here, for longevity. ;)

private class sortYearAscendingHelper : IComparer
{
   int IComparer.Compare(object a, object b)
   {
      car c1=(car)a;
      car c2=(car)b;
      if (c1.year > c2.year)
         return 1;
      if (c1.year < c2.year)
         return -1;
      else
         return 0;
   }
}

The key is you have to return one of three values:

• -1 if the first object is less than the second
• 1 if the first object is greater than the second
• 0 if the values of the two objects are equal

Hope this helps someone,
Ian