读取，覆盖和显示txt文件C＃时出现问题

Question

I got some problems with reading from a txt file. My proj. it's kind of a game, which is able to record highscores, show them and reset them aswell. The problem is that if I reset the highscores (via a ToolStripMenuItem from the main form), the higscores form stops updating.

For example, a step-by-step approach:

1. open app (via debugger) (I mention that the .txt is clean)
2. play a game, record a highscore
3. see the highscores form, my highscore is there
4. reset the highscores
5. open the highscore form again, my highscore is still there. (but it is cleared from the .txt file, because if I reopen the game and open de highscore form again, it is clean)

If I do the steps like 1-2-4-3, when i see the highscores form, it is clean.

Some codes: The reset button works like this:

private void resetToolStripMenuItem1_Click(object sender, EventArgs e)
    {
        DialogResult reset = MessageBox.Show("Are you sure you want to reset the highscores?", "Reset highscores", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning);
        if (reset == DialogResult.OK)
        {
            File.WriteAllText("highscores.txt", string.Empty);
            MessageBox.Show("Successfully reset highscores");
        }
    }

The highscores form_load is like this:

 StreamReader inputFile = File.OpenText("highscores.txt");
        easy = 0; med = 0; hard = 0;
        while ((x = inputFile.ReadLine()) != null)
        {
            string[] words = x.Split('*');
            m = 0;
            foreach (string s in words)
            {
                // here comes some code which keeps one highscore in memory
            }
            // here is that one highscore sorted by difficulty
        }
        inputFile.Close();
//here are the highscores sorted

I didn't write all the code because it was too long, and I believe, irrelevant. Here is the writing of highscores in the txt: (when completing the game, a new form appears with a textbox and a button, here is the code:)

if (DialogResult == DialogResult.OK)
        {
            while (ok == 0)
            {
                string s = textBox1.Text;
                ok = 1;
                for (int i = 0; i < s.Length; i++)
                {
                    if (s[i] == '*') ok = 0;
                }
                if (ok == 0)
                {
                    MessageBox.Show("Your name must not contain the '*' character");
                    textBox1.Text = "";

                }
            }

            StreamWriter outputFile = File.AppendText("highscores.txt");
            outputFile.WriteLine(Form1.dificultate + "*" + Form1.secunde.ToString() + "*" + Form1.moves + "*" + textBox1.Text);
            outputFile.Close();

        }

Answer 1

You can add the event OnVisibleChanged to the form, (Docs here ), and inside that, load the high-score file.

To avoid reloading the high-score list everytime the highscore form is shown(if that is a problem), you can set a global flag when resetting the highscore list, and this flag can decide whether to reload the file again.

Answer 2

As @Hans Passant said, yhe problem was that the for(;;) loop didn't run while the txt was empty. (after it was reset).

while ((x = inputFile.ReadLine()) != null)
        {
            c++;
          //reading and keeping in memory the highscores
        }
  if(c==0) //make all the highscore labels empty, skip sorting the highscores