Question

string strArr="5,3,8,1,9,2,0,6,4,7";

I would like to rearrange the order of the numbers so the result will look like the following:

string result ="0,1,2,3,4,5,6,7,8,9";

Any idea?

Answer 1

Split, sort and join:

string[] nums = strArr.Split(',');
Array.Sort(nums);
string result = String.Join(",", nums);

Or:

string result =
  String.Join(",",
    strArr.Split(',')
    .OrderBy(s => s)
    .ToArray()
  );

If you have a string with larger numbers that need to be sorted numerically, you can’t sort them as strings, as for example “2” > “1000”. You would convert each substring to a number, sort, and then convert them back:

string result =
  String.Join(",",
    strArr
      .Split(',')
      .Select(s => Int32.Parse(s))
      .OrderBy(n => n)
      .Select(n => n.ToString())
      .ToArray()
  );

Or, as mastoj suggested, parse the strings in the sorting:

string result =
  String.Join(",",
    strArr
      .Split(',')
      .OrderBy(s => Int32.Parse(s))
      .ToArray()
  );