while (true)
{
   foreach (ClassEntry ce in unorderedClasses)
   {
      if (ce.FullExtends == null || processedClassNames.Contains(ce.FullExtends))
      {
         // This class extends nothing, or is derived from one of the classes that were already processed.
         // Append it to the list since it's safe to process now.
         sortedList.Add(ce);
         processedClassNames.Add(ce.FullClassName);
         processedInThisIteration.Add(ce);
      }
   }

   unorderedClasses.RemoveAll(processedInThisIteration);

   if (processedInThisIteration.Count == 0)
   {
      if (!unorderedClasses.IsEmpty)
      {
         throw new MappingException(FormatExceptionMessage(unorderedClasses));
      }
      break;
   }

   processedInThisIteration.Clear();
}