Iterator Functions in C#

An iterator method performs a custom iteration over a collection. It uses the yield return statement and returns each element one at a time. The iterator remembers the current location and in the next iteration the next element is returned.

The following is an example −

Example

 Live Demo

using System; using System.Collections.Generic; using System.Linq; namespace Demo {    class Program {       public static IEnumerable display() {          int[] arr = new int[] {99,45,76};          foreach (var val in arr) {             yield return val.ToString();          }       }       public static void Main(string[] args) {          IEnumerable ele = display();          foreach (var element in ele) {             Console.WriteLine(element);          }         }    } }

Output

99 45 76

Above, we have an iterator method display() that use the yield statement to return one element at a time −

public static IEnumerable display() {    int[] arr = new int[] {99,45,76};    foreach (var val in arr) {       yield return val.ToString();    } }

The result is stored and each element is iterated and printed −

IEnumerable ele = display(); foreach (var element in ele) {    Console.WriteLine(element); }