How to get alternate numbers using Enumerable.Range?

Question

If Start=0 and Count=10 then how to get the alternate values using Enumerable.Range() the out put should be like { 0, 2, 4, 6, 8 }

Answer 1

The count parameter in your code looks like an end point of the loop.

public static MyExt
{
  public static IEnumerable Range(int start, int end, Func step)
  {
    //check parameters
    while (start <= end)
    {
        yield return start;
        start = step(start);
    }
  }
}

Usage: MyExt.Range(1, 10, x => x + 2) returns numbers between 1 to 10 with step 2 MyExt.Range(2, 1000, x => x * 2) returns numbers between 2 to 1000 with multiply 2 each time.