Yield Statement in C#

Question

User-1366948256 posted

Yield statement is one of most interesting statement in the C# 2.0. I have heard about lot of yield statement but today i have learned about yield statement. Yield statement can be used to return multiple object from a method while retaining its state. You can get item in sequence with help of yield.Let take a simple example to see the power or yield statement.

Let's create one example which will help you the understand how its works Let create a function will return the square each time this function is called.

 public static IEnumerable<int> Square(int min, int max)
 {
        for (int i = min; i < max; i++)
       {
            yield return i*i;
       }
 }

Now each time this method is called it will return the square of
current value within a given range and its also maintains the state
between calls. Let create for each loop to call the the square function
above.

 foreach (int i in Square(1, 10))
{
    Response.Write(i.ToString() + " ");
 }


And output will be like 1,4,9,16,25,36,49,64,81

 

 

Answer 1

User-725366812 posted

Hi, Jalpesh,

This is very interesting, I agree yield is very powerful command.  But your post is a little difficult to read, so here is it again cleaned up.  Also changed the < to <=, I think it is more sense that the Square(1, 10) should go from 1...100 rather than 1...81:

public static IEnumerable<int> Square(int min, int max)
{
    for (int i = min; i <= max; i++)
    {
        yield return i*i;
    }
}

Now each time this method is called it will return the square of current value within a given range and its also maintains the state between calls. Let create for each loop to call the the square function above.

foreach (int i in Square(1, 10))
{
    Response.Write(i.ToString() + " ");
}

And output will be like 1,4,9,16,25,36,49,64,81,100.

Regards,

~ mellamokb

Answer 2

User-1366948256 posted

Thanks dear