Question

please see the list below :

    string[] Separator = new string[] { "__" };

    string[] lines_acc = File.ReadAllLines(accfilePath);
    List<string> list_lines_acc = new List<string>(lines_acc);

    List<string> list_lines_silver_count = new List<string>();
    FileStream fs_ = null;
    if (!File.Exists(silver_countfilePath))
    {
        using (fs_ = File.Create(silver_countfilePath))
        {
            foreach (string line_acc in list_lines_acc)
            {
                string[] line_acc_ar = line_acc.Split(Separator, StringSplitOptions.None);
                string line_acc_new = line_acc_ar[0] + "__" + line_acc_ar[1] + "__" + line_acc_ar[3] + "__" + line_acc_ar[4] + "__" + "0";
                list_lines_silver_count.Add(line_acc_new);
            }

            File.WriteAllLines(silver_countfilePath, list_lines_silver_count);
        }
    }
    else
    {
        string[] lines_silver_count = File.ReadAllLines(silver_countfilePath);
        list_lines_silver_count = new List<string>(lines_silver_count);
    }

i want to sort list_lines_silver_count by line_acc_ar[4] part!
that part is a string like -> 325423 -> mean i can convert it to an integer.
how can i do that job?

Answer 1

One way is to implement the comparer and provide it as an argument to the Sort function:

public class SilverCountLineComparer : IComparer<string>
{
    public int Compare(string x, string y)
    {
        string xPart = x.Split(new char[] {'_'}, StringSplitOptions.RemoveEmptyEntries)[3];
        string yPart = y.Split(new char[] {'_'}, StringSplitOptions.RemoveEmptyEntries)[3];

        int xNum = Int32.Parse(xPart);
        int yNum = Int32.Parse(yPart);

        return xNum.CompareTo(yNum);
    }
}

And to sort call it like this:

list_lines_silver_count.Sort(new SilverCountLineComparer());