【转】c# winform 创建文件，把值写入文件，读取文件里的值，修改文件的值，对文件的创建，写入，修改

创建文件和读取文件的值

 #region 判断文件是否存在，不存在则创建，否则读取值显示到窗体

 public FormMain()
 {
     InitializeComponent();

     //ReadFile(Application.StartupPath + "\\AlarmSet.txt");

     //也是判断文件是否存在
     //System.IO.DirectoryInfo info = new System.IO.DirectoryInfo(Application.StartupPath + "\\AlarmSet.txt");
     //MessageBox.Show(info.Exists.ToString());

     //MessageBox.Show(Application.StartupPath + "\\AlarmSet.txt");

     //判断文件是否存在
     if (!File.Exists(Application.StartupPath + "\\AlarmSet.txt"))
     {
         //File.Create(Application.StartupPath + "\\AlarmSet.txt");//创建该文件

         FileStream fs1 = new FileStream(Application.StartupPath + "\\AlarmSet.txt", FileMode.Create, FileAccess.Write);//创建写入文件
         StreamWriter sw = new StreamWriter(fs1);
         sw.WriteLine("[runtype]");//开始写入值
         sw.WriteLine("type=1");

         sw.WriteLine("\r\n");

         sw.WriteLine("--报警设置 PPWS 号牌匹配位数 PPWZ 匹配位置 0前匹配 1后匹配");
         sw.WriteLine("[Alarm]");
         sw.WriteLine("PPWZ=0");
         sw.WriteLine("PPWS=8");

         sw.WriteLine("\r\n");

         sw.WriteLine("[Server]");
         sw.WriteLine("ListenPort=2005");

         sw.WriteLine("\r\n");

         sw.WriteLine("[Form]");
         sw.WriteLine("PPWZ=0");

         sw.Close();
         fs1.Close();

     }

     //读取文件值并显示到窗体
     FileStream fs = new FileStream(Application.StartupPath + "\\AlarmSet.txt", FileMode.Open, FileAccess.ReadWrite);
     StreamReader sr = new StreamReader(fs);
     string line = sr.ReadLine();
     int curLine = ;
     while (line != null)
     {
         if (++curLine ==  && line.Equals("PPWZ=0"))//文件第7行并且值为PPWZ=0的时候设置单选钮选中前匹配
         {
             radioButton1.Checked = true;
             radioButton2.Checked = false;
             //MessageBox.Show("前");
         }
         else if (curLine ==  && line.Equals("PPWZ=1"))//文件第8行并且值为PPWZ=1的时候设置单选钮选中后匹配
         {
             radioButton2.Checked = true;
             radioButton1.Checked = false;
             //MessageBox.Show("后");
         }

         if (curLine == )//文件第8行
         {
             textBox1.Text = line.Substring(line.LastIndexOf("=") + );//截取=号后边的值
         }

         //MessageBox.Show("第" + (++curLine).ToString() + "行:   " + line);
         //Console.WriteLine("第" + (++curLine).ToString() + "行:   " + line);
         line = sr.ReadLine();
     }
     sr.Close();
     fs.Close();
 }

 #endregion

修改文件的值

 #region 保存设置 按钮 按下

 private void button6_Click(object sender, EventArgs e)
 {
     if(radioButton1.Checked == true )
     {
         EditFile(, "PPWZ=0", Application.StartupPath + "\\AlarmSet.txt");
         EditFile(, "PPWS=" + textBox1.Text, Application.StartupPath + "\\AlarmSet.txt");
     }

     if (radioButton2.Checked == true)
     {
         EditFile(, "PPWZ=1", Application.StartupPath + "\\AlarmSet.txt");
         EditFile(, "PPWS=" + textBox1.Text, Application.StartupPath + "\\AlarmSet.txt");
     }
 }

 #endregion

 #region 设置匹配

 public static void EditFile(int curLine, string newLineValue, string patch)
 {
     FileStream fs = new FileStream(patch, FileMode.Open, FileAccess.Read);
     StreamReader sr = new StreamReader(fs, Encoding.GetEncoding("utf-8"));//解决写入文件乱码
     string line = sr.ReadLine();
     StringBuilder sb = new StringBuilder();
     for (int i = ; line != null; i++)
     {
         sb.Append(line + "\r\n");
         if (i != curLine - )
             line = sr.ReadLine();
         else
         {
             sr.ReadLine();
             line = newLineValue;
         }
     }
     sr.Close();
     fs.Close();
     FileStream fs1 = new FileStream(patch, FileMode.Open, FileAccess.Write);
     StreamWriter sw = new StreamWriter(fs1);
     sw.Write(sb.ToString());
     sw.Close();
     fs.Close();
 }

 #endregion