How to sort elements of array list in C#

Question

I have an ArrayList that contains,

[0] = \"1\"
[1] = \"10\"
[2] = \"2\"
[3] = \"15\"
[4] = \"17\"
[5] = \"5\"
[6] = \"6\"
[7] = \"27\"
[8] = \"8\"
[9] = \"9\"


        

Answer 1

If you can be sure the list contains only strings that can be transformed to integers, then with the IEnumerable<T>.OrderBy extension method, try this:

var sortedList = list.OrderBy(item => int.Parse(item));

If you're using an ArrayList instead of a List<string> (boo!), you'll need to Cast first:

var sortedList = list.Cast<string>().OrderBy(item => int.Parse(item));

You can also define your own comparer as JaredPar noted, but IMO that's a lot of work for something that's already implemented. However, it's more efficient.

Answer 2

 List<int> liDllCnt = new List<int>();
 for (int temp = 0; temp < alFileName.Count; temp++)
     liDllCnt.Add(Int32.Parse(alFileName[temp].ToString()));
 liDllCnt.Sort();

alFileName is the name of the arraylist that i used.

Answer 3

Maybe you could store the values in a strongly typed list like List instead, and the, if necessary, convert them to string, when cosuming them. Like this:

        List<int> intList = new List<int>(new int[] {3, 2, 1});

        intList.Sort();

        foreach (int theInt in intList)
        {
            System.Diagnostics.Debug.WriteLine(theInt.ToString());
        }