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("");//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("");sw.WriteLine("PPWZ=0");sw.WriteLine("PPWS=8");sw.WriteLine("\r\n");sw.WriteLine("");sw.WriteLine("ListenPort=2005");sw.WriteLine("\r\n");sw.WriteLine("");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 = 0;while (line != null){if (++curLine == 7 && 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 == 8 && 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 == 8)//文件第8行{textBox1.Text = line.Substring(line.LastIndexOf("=") + 1);//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(7, "PPWZ=0", Application.StartupPath + "\\AlarmSet.txt");EditFile(8, "PPWS=" + textBox1.Text, Application.StartupPath + "\\AlarmSet.txt");}if (radioButton2.Checked == true){EditFile(7, "PPWZ=1", Application.StartupPath + "\\AlarmSet.txt");EditFile(8, "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 = 1; line != null; i++){sb.Append(line + "\r\n");if (i != curLine - 1)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
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