c#檔案讀取和寫入的方式總結

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

                            if (File.Exists(path))      ///如果檔案存在，那麼删除檔案 

                                     File.Delete(path);

                            FileStream fs = File.Open(path, FileMode.Create);         ///這裡第二個表示如果檔案不存在，則重建立立一個新的

                            ///FileStream fs = File.Open(path, FileMode.Append);  ///如果要追加内容時用這個

                            fs.Write(bs, 0, bs.Length);                     ///這裡的bs是一個數組byte[]

                            fs.Close();

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

                        if (!File.Exists(str))     ///檢測檔案是否存在

                           {

                                       MessageBox.Show("檔案不存在，請檢視用戶端是否已經上傳資料！");

                           }

                       else

                          {   

                                 FileStream fop = File.OpenRead(str);

                                 byte[] arr = new byte[1000];

                                 while (fop.Read(arr, 0, arr.Length) > 0)    ///這個循環會将檔案所有的内容都讀取出來

                                  {

                                  ClientSocket[1].Send(arr, 0, arr.Length,0);

                                  }

                                 fop.Close();

                             }

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

                string st = "";

               if (!File.Exists(path))

                    MessageBox.Show("檔案不存在，請先建立一個！");

              else

                  {  

                      byte[] b=new byte[10];

                      StreamReader sr = new StreamReader(path);

                      while ((st = sr.ReadLine()) != null)

                           {

                              tb.AppendText(st);

                             MessageBox.Show(st);

                          }

                     sr.Close();

                 }

             if (File.Exists(path))

                        File.Delete(path);

              StreamWriter sw = new StreamWriter(path,true);  /// true表示檔案存在就将内容加在後面，false表示覆寫内容

              sw.Write("today is a good day!");

              sw.Close();

              binaryreader提供了readstring,readbyte,readboolean,readint,readdouble等方法來讀取不同類型的資料，而binarywriter則提供write()方法将各種不同類型的值寫入目前流（也就是write方法的參數可以是任何基本資料類型）。下面以存儲和讀取double類型的資料來舉例。

                                FileStream fs=File.Create(path1);

                        BinaryWriter bw = new BinaryWriter(fs);

                        bw.Write(100.123);

                        bw.Write(200.524);

                        bw.Close();

                        fs.Close();

                               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();