Compiler Error CS1551

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Indexers must have at least one parameter

An indexer that takes no arguments was declared.

The following sample generates CS1551:

// CS1551.cs
public class MyClass
{
   int intI;

   int this[]   // CS1551
   // try the following line instead
   // int this[int i]
   {
      get
      {
         return intI;
      }
      set
      {
         intI = value;
      }
   }

   public static void Main()
   {
   }
}