check condition with range in c# (without using if else statement)

Question

The basic idea we follow is

if (i > 0 && i < 100) {

} else if (i > 100 && 1 < 150) {

}

This is the basic idea for range check..

Is there any good way to check these type of conditions.

Thanks in advance for the help!

http://stackoverflow.com/questions/20147879/switch-case-can-i-use-a-range-instead-of-a-one-number — Mudassir Hasan, Jan 02 '17 at 12:43
Check @Matthew Lock answer here. It's one of better way to do it without if else.http://stackoverflow.com/questions/20147879/switch-case-can-i-use-a-range-instead-of-a-one-number — Praburaj, Jan 02 '17 at 12:47
Thank you very much @Prabu and mh2017. This is working fine for me. — Sivamohan Reddy, Jan 02 '17 at 13:32

score 1 · Accepted Answer · edited May 23 '17 at 12:17

int endX=200;

Click on below link you will get what is the difference @Steve

var switchCond = new Dictionary<Func<int, bool>, Action>
               {
                 { x => x <= 290 , () => endX=244  },  
                 { x => x <= 530, () => endX=488 },
                 { x => x <= 790 , () => endX=732 },
                 { x => x <=1000 || x > 976 , () => endX=976 }

                };
                switchCond.First(sw => sw.Key(endX)).Value();

[Switch case: can I use a range instead of a one number

Charles Bretana · Answer 2 · 2017-01-02T12:49:54.877

0

use ternary operator

 var range = 
     i < 100? "Range1":
     i < 150? "Range2":
     i < 200? "Range3":
     i < 250? "Range4":
     i < 300? "Range5": 
              "Range6";

This is example only to show technique. obviously, you must adapt it to your code objectives and appropriate range definitions. (by the way, in your example, using if- else if, your code misses the value 100. you need to decide which range 100 should be included in, and change one of the inequality operators to either <= or >=.

edited Jan 02 '17 at 12:49

answered Jan 02 '17 at 12:44

Charles Bretana

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Not sure that this is correct. This behaves different for `100` than OP's example (but well, the concept becomes clear). – René Vogt Jan 02 '17 at 12:45
OPs example is not comprehensive, value 100 is not covered at all. – Charles Bretana Jan 02 '17 at 12:49

score 0 · Answer 3 · answered Jan 02 '17 at 17:24

you could have switch construct "handle" ranges by use of a List of your bounds:

        List<int> bounds = new List<int>() {int.MinValue, 0, 100, 150, 200, 300, int.MaxValue };

        switch (bounds.IndexOf(bounds.Last(x => x < j)))
        {
            case 0: // <=0
                break;

            case 1: // > 0 and <=100
                break;
            case 2: // > 100 and <= 150
                break;
            case 3: // > 150 and <=200
                break;
            case 4: // > 200 and <=300
                break;

            case 5: // >300
                break;
        }

where you may have to add some additional checks to

check condition with range in c# (without using if else statement)

3 Answers3