C# SerialPort 控件 串口通信的问题

Question

用rs232串口线交叉连接两台电脑测试接收不到值  代码贴出来 各位前辈 看看 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        private void Form1_Load(object sender, EventArgs e)
        {        }
        //初始化SerialPort对象方法.PortName为COM口名称,例如"COM1","COM2"等,注意是string类型
        public void InitCOM(string PortName)
        {
            serialPort1 = new SerialPort(PortName);
            serialPort1.BaudRate = 9600;//波特率
            serialPort1.Parity = Parity.None;//无奇偶校验位
            serialPort1.StopBits = StopBits.Two;//两个停止位
            serialPort1.Handshake = Handshake.RequestToSend;//控制协议
            serialPort1.ReceivedBytesThreshold = 4;//设置 DataReceived 事件发生前内部输入缓冲区中的字节数        }
        //打开串口的方法
        public void OpenPort()
        {
            try
            {
                serialPort1.Open();
            }
            catch { }
            if (serialPort1.IsOpen)
            {
                Console.WriteLine("the port is opened!");
            }
            else
            {
                Console.WriteLine("failure to open the port!");
            }
        }        //关闭串口的方法
        public void ClosePort()
        {
            serialPort1.Close();
            if (!serialPort1.IsOpen)
            {
                Console.WriteLine("the port is already closed!");
            }
        }
   
        private void button1_Click(object sender, EventArgs e)
        {
            InitCOM("COM3");
            OpenPort();            byte[] data = Encoding.Unicode.GetBytes(this.textBox1.Text);
            string str = Convert.ToBase64String(data);
            serialPort1.WriteLine(str);
            ClosePort();
            MessageBox.Show(this, "利用串口成功发送数据！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }
       
         //DataReceived事件委托方法
        private void port1_DataReceived(object sender, SerialDataReceivedEventArgs e)
          {
             try
             {
                 StringBuilder currentline = new StringBuilder();
                 //循环接收数据
                 while (serialPort1.BytesToRead > 0)
                  {
                      char ch = (char)serialPort1.ReadByte();
                      currentline.Append(ch);
                  }
                  //在这里对接收到的数据进行处理
                  //
                  currentline = new StringBuilder();
              }
              catch(Exception ex)
              {
                  Console.WriteLine(ex.Message.ToString());
              }
  
         }        private void button2_Click(object sender, EventArgs e)
        {
            try
            {
                byte[] datar = Convert.FromBase64String(serialPort1.ReadLine());
                textBox2.Text = Encoding.Unicode.GetString(datar);
                ClosePort();
                MessageBox.Show(this, "利用串口成功接收数据！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch
            {
                ClosePort();
                MessageBox.Show(this, "利用串口接收数据失败！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
        }
    }
}
C# SerialPort串口通信

Answer 1

那就是代码问题
你必须打开接收数据的那个串口 并且设置这个串口的port1_DataReceived处理函数
倒是那个发送数据的串口只需要打开，然后发送数据即可