请问这代码控制串口打印机怎么不立即打印啊。。。。

[github_34212286]

using System;
using System.IO.Ports;
using System.Text;
using System.Threading;
using System.Windows.Forms;
using V9_OUT.Util;

namespace V9_OUT.Devices
{
    public sealed class COMBTP : IDevice
    {
        private static readonly COMBTP instance = new COMBTP();
        private SerialPort serialPort;
        private string iniFileName;
        private string PortName;
        private int BaudRate;
        private int DataBits;
        private StopBits StopBits;
        private Parity Parity;
        private string Flag;
        private string btpCode;
        private string STX;
        private string ETX;
        private string BTPPECFLAG;
        private string BTP_PECTABS;
        public static COMBTP GetInstance
        {
            get { return instance; }
        }

        /// <summary>
        /// 构造函数
        /// </summary>
        private COMBTP()
        {
            Init();
        }

        private void Init()
        {
            try
            {
                iniFileName = "config\\BTP.ini";
                PortName = IniHelper.GetValue("SETTING", "PortName", iniFileName);
                BaudRate = Convert.ToInt32(IniHelper.GetValue("SETTING", "BaudRate", iniFileName));
                DataBits = Convert.ToInt32(IniHelper.GetValue("SETTING", "DataBits", iniFileName));
                StopBits = (StopBits)Convert.ToInt32( IniHelper.GetValue("SETTING", "StopBits", iniFileName));
                Parity = (Parity)Convert.ToInt32( IniHelper.GetValue("SETTING", "Parity", iniFileName));
                Flag = IniHelper.GetValue("SETTING", "FLAG", iniFileName);
                btpCode = IniHelper.GetValue("SETTING", "CODE", iniFileName);
                STX = IniHelper.GetValue("SETTING", "STX", iniFileName);
                ETX = IniHelper.GetValue("SETTING", "ETX", iniFileName);
                serialPort = new SerialPort(PortName, BaudRate, Parity, DataBits, StopBits);
                serialPort.WriteTimeout = 500;
                serialPort.ReadTimeout = 500;
                serialPort.Open();
                BTPPECFLAG = IniHelper.GetValue("PECTABS", "FLAG", "N", iniFileName);
                StringBuilder sb = new StringBuilder();
                if (BTPPECFLAG.Equals("Y"))
                {
                    int BTP_PECTABS_MIN = Convert.ToInt32(IniHelper.GetValue("PECTABS", "min", "0", iniFileName));
                    int BTP_PECTABS_MAX = Convert.ToInt32(IniHelper.GetValue("PECTABS", "max", "0", iniFileName));
                    for (int i = BTP_PECTABS_MIN; i <= BTP_PECTABS_MAX; i++)
                    {
                        String BTP_PECTABS_TEMP = IniHelper.GetValue("PECTABS", Convert.ToString(i), "", iniFileName);
                        sb.Append(BTP_PECTABS_TEMP);
                    }
                    BTP_PECTABS = sb.ToString();
                    DoWork(BTP_PECTABS);
                }
            }
            catch (Exception ex)
            {
                LogHelper.WriteLog(typeof(ATB423), ex);
            }
        }

        /// <summary>
        /// 串口接收数据响应函数
        /// </summary>
        private void SerialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            try
            {
                
            }
            catch (Exception ex)
            {
                LogHelper.WriteLog(typeof(ATB423), ex);
            }
        }

        public string DoWork(string command)
        {
            serialPort.DiscardInBuffer();
            serialPort.DiscardOutBuffer();
            string newSTX = STX;
            string newETX = ETX;
            try
            {
                if (STX.Length > 0)
                {
                    newSTX = Encoding.ASCII.GetString(new byte[] { Convert.ToByte(STX) });
                }
                if (ETX.Length > 0)
                {
                    newETX = Encoding.ASCII.GetString(new byte[] { Convert.ToByte(ETX) });
                }
                string temp = newSTX + command + newETX;
                if (!serialPort.IsOpen)
                {
                    serialPort.Open();
                }
                //serialPort.WriteLine(temp);
                //serialPort.Open();
                byte[] x = Encoding.GetEncoding("GBK").GetBytes(temp);
                serialPort.BaseStream.Write(x, 0, x.Length);
                //serialPort.Write(x, 0, x.Length);
                serialPort.BaseStream.Flush();
                //serialPort.Close();
                //serialPort.Dispose();
                //serialPort.DiscardInBuffer();
                //serialPort.DiscardOutBuffer();
                return "true";
            }
            catch (Exception ex)
            {
                LogHelper.WriteLog(typeof(COMBTP), ex.StackTrace);
                return "false";
            }
        }

        /// <summary>
        /// 打开串口
        /// </summary>
        public bool Start()
        {
            LogHelper.WriteLog(typeof(COMBTP), "COMBTP没有Start方法");
            return true;
        }

        /// <summary>
        /// 关闭串口
        /// </summary>
        /// <returns></returns>
        public bool Close()
        {
            try
            {
                if (this.serialPort.IsOpen)
                {
                    this.serialPort.Close();
                }
                return true;
            }
            catch (Exception ex)
            {
                LogHelper.WriteLog(typeof(COMBTP), ex);
                return false;
            }
        }
    }
}

运行程序后没有立即打印，我重启电脑就把所有的打印了

[github_34212286]

来人啊！！！！！！！

[github_34212286]

来人啊，急啊