FileStream在file.exe关闭的同时读写器

Question

我想在File.txt中写一个计数器，只要我关闭我的file.exe。
例如，在第一次关闭它时，它必须写入1，第二次而不是1，它必须是2，第三次必须是3，依此类推。

但问题是，在任何时候，编译器都必须读取存储在文件中的数字，然后将其增加，然后编写它。

这里是我的代码：

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.IO; 
using System.Windows.Forms; 

namespace check 
{ 
    public partial class Form1 : Form 
    { 
     public string[] line = { "1", "2", "3", "4", "5", "6", "7", "8", "9","10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20" }; 
     public int i = 0; 

     public Form1() 
     { 
      InitializeComponent(); 
     } 

     private void Form1_FormClosing(object sender, FormClosingEventArgs e) 
     { 
      FileStream textfile = new FileStream(@"C:\TtAL.txt", FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None); 
      var Reader = new StreamReader(textfile); 
      var Writer = new StreamWriter(textfile); 
      i = Convert.ToInt32(File.ReadAllText(@"C:\TtAL.txt")); 
      if (File.ReadAllText(@"C:\TtAL.txt") == null) { i = -1; } 
      i ++; 
      File.WriteAllText(@"C:\TtAL.txt", line[i]); 

      MessageBox.Show(20 - Convert.ToUInt32(line[i]) + " times remained."); 
      textfile.Close(); 
     } 
    } 
} 

Answer 1

像这样将工作：

private void Form1_FormClosing(object sender, FormClosingEventArgs e) 
{ 
    int i = 1; 

    if (File.Exists(@"C:\TtAL.txt")) //if there is a file try to use it 
    { 
     if (int.TryParse(File.ReadAllText(@"C:\TtAL.txt"), out i)) //if you can get a number use it 
      i++; 
    } 

    File.WriteAllText(@"C:\TtAL.txt", i.ToString()); 
}