if (a.ToString() != readCount.ToString())//断点续传

                {

                    Uri urii=new Uri("ftp://192.168.1.123:21");

                    FileInfo fileInfo = new FileInfo("E:\\报价\\巴比来定制产品.rar");

                    long locSize = fileInfo.Length;

                    RestartDownloadFromServer("巴比来定制产品.rar", urii, locSize);

                    CloseSocketConnect();

                    Socket soketData = CreateDataSocket();

                    Byte[] cmdType = GB2312.GetBytes(("TYPE I \r\n"));

                    socketControl.Send(cmdType, cmdType.Length, 0);



                    MessageBox.Show("开始断点续传");

                    FileStream output = new

                    FileStream("E:\\报价\\" + "巴比来定制产品.rar", FileMode.Append, FileAccess.Write);

                    Byte[] cmdPASV = GB2312.GetBytes(("PASV \r\n").ToCharArray());

                    socketControl.Send(cmdPASV, cmdPASV.Length, 0);

                    //获取本地文长度

                    FileInfo fileInfo = new FileInfo("E:\\报价\\巴比来定制产品.rar");

                    long locSize = fileInfo.Length;