C# Using Enumerable.Range()

Question

Am I using this is the correct manner? As far as I understand it, the following check should be false:

 int myVal = 37;
 if (Enumerable.Range(0, 10).Contains(myVal))
    // Do something
 else if (Enumerable.Range(11, 33).Contains(myVal))
    // Do somethiong else

But I seem to be getting some cases where //Do somethiong else is executed. Can I not use Enumerable.Range is this way?

Answer 1

The signature for Enumerable.Range provides a clue:

public static IEnumerable<int> Range(
    int start,
    int count
)

The first parameter is called start; the second is called count. So your second call is returning 33 values starting with 11, which will include 37.

Answer 2

If this particular example, its inefficient to create an enumerate in this fashion simply to check that a value lies within a particular range. if (x < y) is probably better.

Answer 3

It will result in every value being checked, and is a little confusing, why not do:

int myVal = 37;
if (myVal >= 0 && myVal <= 10)
    // Do something
else if (myVal <= 33)
    // Do somethiong else