What is the use of yield keyword in C#?

Answer:

Yield keyword is used in an iterator block to calculate the value for the enumerator object.

An iterator is a method,
get accessor, or operator that allows us to use foreach loop on object references of user-defined classes.

yield keyword can be used as:

1)yield return <expression>;
or
2)yield break;


code snippet

using System;

//This namespace provides the IEnumerator interface

using System.Collections;

public class demo

{

//GetEnumerator method of  IEnumerable interface creates the iterator

public  IEnumerator  GetEnumerator()

{

    for (int i = 1; i <=5; i++)

    {

        yield return i;

    }

}





    static void Main()

    {



   demo t=new demo();



//foreach loop calls the GetEnumerator method

        foreach (int i in t)

        {

            Console.WriteLine(i);

        }

    }

}

output:

1
2
3
4
5