从 TCP 侦听器中的网络流读取数据

我有一个网络流，其中包含文件名和文件数据。我正在以一些块发送文件，每个块都带有文件名以便于识别。您能否帮助我正确读取网络流并将所有数据写入文件流。当我从网络流写入数据时，我似乎错过了几个字节。例如，文件名长度将在第 4 个索引中，文件名将从第 4 个索引开始。

    Client:
    int NoOfPackets = Convert.ToInt32
          (Math.Ceiling((Convert.ToDouble(Fs.Length))/ Convert.ToDouble(BufferSize)));
           int TotalLength = (NoOfPackets *4+fileNameByte.Length) +(int)Fs.Length,     CurrentPacketLength, counter = 0;
        netstream1 = client.GetStream();
          for (int i = 0; i < NoOfPackets+1 ; i++)
          {
              if (TotalLength > BufferSize)
              {
                  CurrentPacketLength = BufferSize;
                  TotalLength = TotalLength - CurrentPacketLength;
              }
              else
                  CurrentPacketLength = TotalLength;
              SendingBuffer = new byte[CurrentPacketLength];
             fileNameLength.CopyTo(SendingBuffer, 0);
              fileNameByte.CopyTo(SendingBuffer, 4);
              Fs.Read(SendingBuffer, 4 + fileNameByte.Length, CurrentPacketLength - (4 + fileNameByte.Length));
             netstream1.Write(SendingBuffer, 0, SendingBuffer.Length);
               netstream1.Flush();
                 }

侦听器代码：

           client = Listener.AcceptTcpClient();
                    client.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive, true);
                    //client.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Linger, true);
                    client.Client.LingerState = new LingerOption(true, 300);
                    client.Client.SendTimeout = 300000;                     
                    client.Client.ReceiveTimeout = 300000;
                    client.NoDelay = true;
                    NetworkStream netstream = client.GetStream();
                    MemoryStream ms = new MemoryStream();
                    bool first = true;
                    string fullPath = "";
                    byte[] RecData = new byte[512000];
                    while ((RecBytes = netstream.Read
                        (RecData, 0, RecData.Length)) > 0)
                    {
                        int fileNameLen = RecData[0];
                        if (fileNameLen > 0 && first)
                        {
                            string name1 = "", name2 = "";
                            first = false;
                            name1 = Encoding.UTF8.GetString(RecData, 4, fileNameLen);

                            name2 = name1;
                            string folderName = "";
                            if (name2.Contains("''"))
                            {
                                folderName = name2.Substring(0, name2.LastIndexOf("''"));
                                if (!Directory.Exists("D:''123''" + folderName))
                                    Directory.CreateDirectory("D:''123''" + folderName);
                            }
                            if (folderName != "")
                                fullPath = "D:''123''" + folderName + "''" + name2.Substring(name2.LastIndexOf("''") + 1);
                            else
                                fullPath = "D:''123''" + name2.Substring(name2.LastIndexOf("''") + 1);
                        }

                        if (!File.Exists(fullPath))
                        {
                            //file = new FileStream(fullPath, FileMode.OpenOrCreate, FileAccess.Write);
                            while (true)
                            {
                                try
                                {
                                    using (FileStream file = new FileStream(fullPath, FileMode.OpenOrCreate, FileAccess.Write))
                                    {
                                        if (RecBytes - (4 + fileNameLen) > 0)
                                            file.Write(RecData, 4 + fileNameLen, RecBytes - (4 + fileNameLen));
                                        break;
                                    }
                                }
                                catch (IOException)
                                {
                                    Thread.Sleep(20);
                                }
                            }
                            //using (file = File.Create(fullPath))
                            //{
                            //    file.Write(data, 4 + fileNameLen, (int)data.Length - (4 + fileNameLen));
                            //}

                        }
                        else
                        {
                            while (true)
                            {
                                try
                                {
                                    using (FileStream file = new FileStream(fullPath, FileMode.Append, FileAccess.Write))
                                    {
                                        if (RecBytes - (4 + fileNameLen) > 0)
                                            file.Write(RecData, 4 + fileNameLen, RecBytes - (4 + fileNameLen));
                                        break;
                                    }
                                }
                                catch (IOException)
                                {
                                    Thread.Sleep(20);
                                }
                            }
                        }

                    }
                    ms.Close();
                    netstream.Close();
                    client.Close();