文件读写总结

FileStream fs = new FileStream(Server.MapPath(".") + @"test.txt", FileMode.OpenOrCreate, FileAccess.Read);
            StreamReader sr = new StreamReader(fs);
            StringBuilder sb = new StringBuilder();
            string str = "";
            while ((str = sr.ReadLine()) != null)
            {
                sb.Append(str);
            }
            sr.Close();
            Label1.Text = sb.ToString();

            FileStream st = new FileStream(Server.MapPath(".")+@"/test.txt",FileMode.OpenOrCreate,FileAccess.Write);
            StreamWriter sw = new StreamWriter(st);
            sw.WriteLine("asfd");
            sw.WriteLine("aaaa");
            sw.Flush();
            sw.Close();

            StreamWriter sww = File.CreateText(Server.MapPath(".")+@"/temp.txt");
            sww.WriteLine("测试");
            sww.WriteLine(".NET");
            sww.WriteLine("读写");
            sww.Flush();
            sww.Close();

            StreamReader srr = File.OpenText(Server.MapPath(".") + @"/temp.txt");
            StringBuilder sbb = new StringBuilder();
            string ss = "";
            while ((ss = srr.ReadLine()) != null)
            {
                sbb.Append(ss);
            }
            srr.Close();
            //C#删除文件
            File.Delete(Server.MapPath(".")+@"/2.txt");
            //C#移动文件
            File.Move(Server.MapPath(".") + @"/2.txt", Server.MapPath(".") + @"/wenjian/2.txt");
            //C#拷贝文件
            File.Copy(Server.MapPath(".") + @"/2.txt", Server.MapPath(".") + @"/wenjian/2.txt");