Convert list to number range string

Question

This question is pretty much the opposite of this question: Does C# have built-in support for parsing page-number strings?

So given

1,3,5,6,7,8,9,10         


        

Answer 1

Had to solve same problem. Was finding alternatives to my solution which I think looks more logical. Therefore sharing it. Set second parameter to true if you want to sort an unsorted list.

public string ToRangeString(List list, bool withSort) {
  list = list.Distinct().ToList();
  if(withSort) list.Sort();

  StringBuilder result = new StringBuilder();
  int temp;

  for (int i=0; i