What is yield in c#?

Hi,

 

The yield keyword actually does quite a lot here. The function returns an object that implements the IEnumerable interface. If a calling function starts foreach-ing over this object the function is called again until it "yields" 

 

For more details follows.

 

http://adventuresdotnet.blogspot.in/2010/06/understanding-cs-yield-keyword-and.html

 

https://msdn.microsoft.com/en-us/library/9k7k7cf0.aspx 

The yield keyword actually does quite a lot here. The function returns an object that implements the IEnumerable interface. If a calling function starts foreach-ing over this object the function is called again until it “yields”. This is syntactic sugar introduced in C# 2.0. In earlier versions you had to create your own IEnumerable and IEnumerator objects to do stuff like this. The easiest way understand code like this is to type in an example, set some breakpoints and see what happens. Try stepping through this for example:

public void Consumer()

{

foreach(int i in Integers())

{

Console.WriteLine(i.ToString());

}

}

public IEnumerable Integers()

{

yield return 1;

yield return 2;

yield return 4;

yield return 8;

yield return 16;

yield return 16777216;

}

Yield keyword basically allows each iteration in a foreach-loop be generated only when needed. In this way it can improve performance. It generally helps us to do custom stateful iteration over .NET collections.”

For more information..you can follow this links

1)http://www.c-sharpcorner.com/UploadFile/b1df45/yield-keyword-in-C-Sharp/

2) https://www.dotnetperls.com/yield

3) https://www.codeproject.com/Articles/575713/What-is-the-use-of-csharp-Yield-keyword