1.使用FIleStream（它存储或者读取都是用BYTE数组或者是BYTE）

      1.1文件写入部分：

                                    string path = "C:\\test.txt";

                                                         if (File.Exists(path))      ///如果文件存在，那么删除文件 

                                     File.Delete(path);

                            FileStream fs = File.Open(path, FileMode.Create);         ///这里第二个表示如果文件不存在，则重新建立一个新的

                            ///FileStream fs = File.Open(path, FileMode.Append);  ///如果要追加内容时用这个

                          

                            fs.Write(bs, 0, bs.Length);                     ///这里的bs是一个数组byte[]

                                                   fs.Close();

 

     1.2文件读取部分：

                   string str = "C:\\test.txt";

                        if (!File.Exists(str))     ///检测文件是否存在                            {                                        MessageBox.Show("文件不存在，请查看客户端是否已经上传数据！");                            }                        else                           {                                     FileStream fop = File.OpenRead(str);                                  byte[] arr = new byte[1000];                                  while (fop.Read(arr, 0, arr.Length) > 0)    ///这个循环会将文件所有的内容都读取出来                                   {                                   ClientSocket[1].Send(arr, 0, arr.Length,0);                                   }                                  fop.Close();                              }

 

2.StreamWriter和StreamReader（操作对象是字符或者字符串）

       2.1文件读取部分：

                string path="C:\\TEST.txt";

                string st = "";

               if (!File.Exists(path))                     MessageBox.Show("文件不存在，请先新建一个！");               else                   {  

                      byte[] b=new byte[10];

                      StreamReader sr = new StreamReader(path);                       while ((st = sr.ReadLine()) != null)                            {                               tb.AppendText(st);                              MessageBox.Show(st);                           }                      sr.Close();                                   }

 

       2.2文件写入部分

             if (File.Exists(path))

                        File.Delete(path);               StreamWriter sw = new StreamWriter(path,true);  /// true表示文件存在就将内容加在后面，false表示覆盖内容               sw.Write("today is a good day!");               sw.Close();

 

3.使用binaryreader和binarywriter进行文件读写操作（可以对任何基本数据类型进行操作）

              binaryreader提供了readstring,readbyte,readboolean,readint,readdouble等方法来读取不同类型的数据，而binarywriter则提供write()方法将各种不同类型的值写入当前流（也就是write方法的参数可以是任何基本数据类型）。下面以存储和读取double类型的数据来举例。

     3.1 binarywrite写入数据

                                FileStream fs=File.Create(path1);

                        BinaryWriter bw = new BinaryWriter(fs);                         bw.Write(100.123);                         bw.Write(200.524);                         bw.Close();                         fs.Close();

     3.2 binaryreader读取数据

                               FileStream fs1 = new FileStream(path1, FileMode.Open);

                       BinaryReader br = new BinaryReader(fs1);                        Console.WriteLine("{0}",br.ReadDouble());                        Console.WriteLine("{0}", br.ReadDouble());                        br.Close();                        fs.Close();