What are indexers in C#?

CsharpProgrammingServer Side Programming

An indexer allows an object to be indexed such as an array.

Let us see the syntax −

element-type this[int index] {
   // The get accessor.
   get {
      // return the value specified by index
   }
   // The set accessor.
   set {
      // set the value specified by index
   }
}

The following is an example showing how to implement indexers in C# −

Example

 Live Demo

using System;
namespace Demo {
   class Program {
      private string[] namelist = new string[size];
      static public int size = 10;
      public Program() {
         for (int i = 0; i < size; i++)
         namelist[i] = "N. A.";
      }
      public string this[int index] {
         get {
            string tmp;
            if( index >= 0 && index <= size-1 ) {
               tmp = namelist[index];
            } else {
               tmp = "";
            }
            return ( tmp );
         }
         set {
            if( index >= 0 && index <= size-1 ) {
               namelist[index] = value;
            }
         }
      }
      static void Main(string[] args) {
         Program names = new Program();
         names[0] = "Tom";
         names[1] = "Jacob";
         names[2] = "Jack";
         names[3] = "Amy";
         names[4] = "Katy";
         names[5] = "Taylor";
         names[6] = "Brad";
         names[7] = "Scarlett";
         names[8] = "James";
         for ( int i = 0; i < Program.size; i++ ) {
            Console.WriteLine(names[i]);
         }
         Console.ReadKey();
      }
   }
}

Output

Tom
Jacob
Jack
Amy
Katy
Taylor
Brad
Scarlett
James
N. A.
raja
Published on 10-Aug-2018 14:19:42
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