C#:对txt文件的读写

            File.WriteAllLines(Application.StartupPath + @"\班级.txt", banji, Encoding.UTF8);//将所有行数据写进数组里面

            class = File.ReadAllLines(Application.StartupPath + @"\班级.txt");//将数组里面的数据写进文件

 

　　名称空间：

using System.IO;

 

新建一个txt文件

            string path = "g:/txt/" + str + ".txt";
            using (StreamWriter sw = new StreamWriter(path, true, Encoding.Unicode))
            {
                sw.Write("测试");
            }

对txt文件的追加

            StreamWriter sw = File.AppendText("g:\\Text.txt");
            sw.WriteLine(kvp.Value);
            sw.Close();