NGWS SDK Documentation  

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Compiler Error CS0559

The parameter and return type for ++ or -- operator must be the containing type

The method declaration for an operator overload must follow certain guidelines.

The following sample generates CS0559:

namespace x {
   public class iii {
      public static implicit operator int(iii x) {
         return 0;
      }
      public static implicit operator iii(int x) {
         return null;
      }
      public static int operator ++(int aa)   // CS0559
      // try the following line instead
      // public static iii operator ++(iii aa) {
         return (iii)0;
      }
      public static void Main() {
      }
   }
}