Sort an array in reverse order

C# Code Snippets

C# Source Code Bank System.Collections namespace

See also … C# Language Reference C# Language Specification

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This C# code snippet sorts an array into reverse (descending) order using the IComparer interface.

using System;
using System.Collections;
 
public class ReverseArraySort
{
   public class ReverseComparer: IComparer
   {
      public int Compare (Object object1, Object object2)
      {
         return -((IComparable)  object1).CompareTo (object2);
      } 
   }
 
   public static void Main()
   {
      string[] strings = {"beta", "alpha", "gamma"};
      Console.WriteLine ("Array elements: ");
      DisplayArray  (strings);
      Array.Sort    (strings, new ReverseComparer());
      DisplayArray  (strings);      
   }
 
   public static void DisplayArray (Array array)
   {
      foreach (object o in array)
      {
         Console.Write ("{0} ", o);
      }
      Console.WriteLine();
   }
}

ICollection Count example (program output)

Array elements: beta alpha gamma gamma beta alpha