C# streamreader and streamwriter onto same file

Question

How do I read and write onto the same file?

A sample of my code looks like this:

List<string> Data = new List<string>();

StreamReader sr = new StreamReader(@"C:\Users\manda\Desktop\Schule\Pos1\HüW2Casino\Spieler1.conf");

StreamWriter sw = new StreamWriter(@"C:\Users\manda\Desktop\Schule\Pos1\HüW2Casino\Spieler1.conf");

while ((line = sr.ReadLine()) != null)
{
    Data.Add(line);
}

int budget = int.Parse(Data[1].Substring(15, 3));

for (int i = 0; i < Data.Count; i++)
{
    if (Data[i] != "ENDE")
    {
        numb = rnd.Next(0, 7);

        if (Data[i].Substring(0,1) == "0" || Data[i].Substring(0, 1) == "1" || Data[i].Substring(0, 1) == "2" || Data[i].Substring(0, 1) == "3" || Data[i].Substring(0, 1) == "4" || Data[i].Substring(0, 1) == "5" || Data[i].Substring(0, 1) == "6" || Data[i].Substring(0, 1) == "7")
        {
            betnumb = int.Parse(Data[i].Substring(0, 1));
            betamount = int.Parse(Data[i].Split(' ') [1]);

            if (betnumb == numb)
            {
                budget += betamount * 7;
            }
            else
            {
                budget -= betamount;
            }

            if (budget < 0)
            {
                sw.Write("Pleite");
                Console.WriteLine("Pleite");
            }
        }
    }
}

But it seems like I can't read and write onto the same file, as there are no changes to the file, never.

Maybe anyone knows what my problem is?

Answer 1

Use Flush to reflect the changes to file or set StreamWriter.AutoFlush = true

List<string> Data = new List<string>();
string path = @"C:\Users\manda\Desktop\Schule\Pos1\HüW2Casino\Spieler1.conf"

FileStream fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None);
StreamReader sr = new StreamReader(fs);
StreamWriter sw = new StreamWriter(fs);

while ((line=sr.ReadLine()) != null)
{
   Data.Add(line);
}

int budget = int.Parse(Data[1].Substring(15, 3));

for (int i = 0; i < Data.Count; i++)
{
    if (Data[i] != "ENDE")
    {
       numb = rnd.Next(0, 7);

       if (Data[i].Substring(0,1) == "0" || Data[i].Substring(0, 1) == "1" || Data[i].Substring(0, 1) == "2" || Data[i].Substring(0, 1) == "3" || Data[i].Substring(0, 1) == "4" || Data[i].Substring(0, 1) == "5" || Data[i].Substring(0, 1) == "6" || Data[i].Substring(0, 1) == "7")
       {
           betnumb = int.Parse(Data[i].Substring(0, 1));
           betamount = int.Parse(Data[i].Split(' ') [1]);

           if (betnumb == numb)
           {
              budget+=betamount*7;
           }
           else
           {
               budget -= betamount;
           }

           if (budget < 0)
           {
               sw.Write("Pleite");
               sw.Flush();

               Console.WriteLine("Pleite");
           }
        }
    }
}