本人菜鸟跪求解答真心希望大侠能帮帮，c#串口通信程序连接两台计算机。程序是网上下载的，运行没问题，可是好像用不了，不知道问题出在哪里，真心希望各位大侠可以帮帮我

Question

真心希望各位大侠能帮帮我，谢谢了
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;
namespace SerialComMaster
{
    public partial class Form1 : Form
    {
        SerialPort sp = null;
        bool isOpen = false;
        bool isSetProperty = false;
               public Form1()
        {            InitializeComponent();
        }        private void Form1_Load(object sender, EventArgs e)
        {
            this.MaximumSize = this.Size;
            this.MinimumSize = this.Size;
            this.MaximizeBox = false;
            for (int i = 0; i < 256; i++)
            {
                comboBox1.Items.Add("COM" + (i + 1).ToString());
            }
            comboBox1.SelectedIndex = 0;
            //列出常用的波特率
            comboBox2.Items.Add("300");
            comboBox2.Items.Add("600");
            comboBox2.Items.Add("1200");
            comboBox2.Items.Add("2400");
            comboBox2.Items.Add("4800");
            comboBox2.Items.Add("9600");
            comboBox2.Items.Add("19200");
            comboBox2.Items.Add("38400");
            comboBox2.Items.Add("43000");
            comboBox2.Items.Add("56000");
            comboBox2.Items.Add("57600");
            comboBox2.Items.Add("115200");
            comboBox2.SelectedIndex = 5;
            //列出停止位
            comboBox3.Items.Add("0");
            comboBox3.Items.Add("1");
            comboBox3.Items.Add("1.5");
            comboBox3.Items.Add("2");
            comboBox3.SelectedIndex = 1;
            //列出数据位
            comboBox5.Items.Add("8");
            comboBox5.Items.Add("7");
            comboBox5.Items.Add("6");
            comboBox5.Items.Add("5");
            comboBox5.SelectedIndex = 0;
            //列出奇偶校验位
            comboBox4.Items.Add("无");
            comboBox4.Items.Add("奇校验");
            comboBox4.Items.Add("偶校验");
            comboBox4.SelectedIndex = 0;        }        private void button1_Click(object sender, EventArgs e)
        {//检测哪些串口可用
            comboBox1.Items.Clear();
            for (int i = 0; i < 256; i++)
            {
                try
                {
                    SerialPort sp = new SerialPort("COM" + (i + 1).ToString());
                    sp.Open();
                    sp.Close();
                    comboBox1.Items.Add("COM" + (i + 1).ToString());
                }
                catch (Exception)
                {
                   
                    continue;
                }
            }
           
               
                
        }
        private bool CheckPortSetting()
        {//检查串口是否设置
            if (comboBox1.Text.Trim() == "") return false;
            if (comboBox2.Text.Trim() == "") return false;
            if (comboBox3.Text.Trim() == "") return false;
            if (comboBox4.Text.Trim() == "") return false;
            if (comboBox5.Text.Trim() == "") return false;
            return true;
        }
        private bool CheckSendData()
        {
            if (textBox1.Text.Trim ()== "") return false;
            return false;
        }
        private void SetPortProperty()
        {//设置串口的属性
            sp = new SerialPort();
            sp.PortName = comboBox1.Text.Trim();//设置串口名
            //设置串口的波特率
            sp.BaudRate = Convert.ToInt32(comboBox2.Text.Trim());
            //设置停止位
            float f = Convert.ToSingle(comboBox3.Text.Trim());
            if (f == 0)
            {
                sp.StopBits = StopBits.None;
            }
            else if (f == 1)
            {
                sp.StopBits = StopBits.One;
            }
            else if (f == 2)
            {
                sp.StopBits = StopBits.Two;
            }
            else
            {
                sp.StopBits = StopBits.One;
            }
            //设置数据位
            sp.DataBits = Convert.ToInt16(comboBox5.Text.Trim());
            //设置奇偶校验位
            string s = comboBox4.Text.Trim();
            if (s.CompareTo("无") == 0)
            {
                sp.Parity = Parity.None;
            }
            else if (s.CompareTo("奇校验") == 0)
            {
                sp.Parity = Parity.Odd;
            }
            else if (s.CompareTo("偶校验") == 0)
            {
                sp.Parity = Parity.Even;
            }
            else
            {
                sp.Parity = Parity.None;
            }
            //设置超时读取时间
            sp.ReadTimeout = -1;
            //打开串口
            try
            {
                sp.Open();
                isOpen = true;
            }
            catch (Exception)
            {
                label6.Text = "打开串口时发生错误！";
            }
        }        private void button2_Click(object sender, EventArgs e)
        {//发送串口数据
            if (!CheckPortSetting())
            {
                MessageBox.Show("串口未设置！","错误提示");
                return;
            }
            if (!CheckSendData())
            {
                MessageBox.Show("请输入要发送的数据","错误提示");
                return;
            }
            if (!isSetProperty)
            {
                SetPortProperty();
                isSetProperty = true;
            }
            if (isOpen)
            {//写串口数据
                try
                {
                    sp.WriteLine(comboBox1.Text);
                }
                catch (Exception)
                {
                    label6.Text = "发送数据时发生错误";
                    return;
                }
            }
            else
            {
                MessageBox.Show("串口未打开！", "错误提示");
                return;
            }
            comboBox1.Text = "";
        }        private void button3_Click(object sender, EventArgs e)
        {
            sp.Close();
            this.Close();
        }        private void button4_Click(object sender, EventArgs e)
        {
            if (isOpen)
            {
                try
                {//读取串口数据
                    comboBox2.Text += sp.ReadLine();
                }
                catch (Exception)
                {
                    label6.Text = "读取串口时发生错误！";
                    return;
                }
            }
            else
            {
                MessageBox.Show("串口未打开！", "错误提示");
                return;
            }
        }    }
}

Answer 1

这里主要使用的对象是SerialPort
设置SerialPort的端口、波特率、奇偶校验等
使用时Open();后Write(数据);不需完全照抄网上的，根据实际业务做吧

Answer 2

居然有这样的代码，如何能检查通过？private bool CheckSendData()
{
  if (textBox1.Text.Trim ()== "") return false;
  return false;
}

Answer 3

        SerialPort serialPort = new SerialPort();
        /// <summary>
        /// 打开串口
        /// </summary>
        /// <param name="portName">串口号</param>
        /// <param name="baudRate">波特率</param>
        /// <param name="parity">奇偶校验</param>
        /// <param name="stopBits">停止位</param>
        /// <returns></returns>
        private bool StartSerialPort(string portName,int baudRate,Parity parity,StopBits stopBits)
        {
            try
            {                
                serialPort.PortName = portName;
                serialPort.BaudRate = baudRate;
                serialPort.Parity = parity;
                serialPort.StopBits = stopBits;
                serialPort.DataReceived += new SerialDataReceivedEventHandler(serialPort_DataReceived);
                serialPort.Open();
                return true;
            }
            catch (Exception ex)
            {                                
            }
            return false;            
        }        /// <summary>
        /// 关闭串口
        /// </summary>
        private void StopSerialPort()
        {
            if (serialPort != null)
            {
                serialPort.Close();
            }
        }        //接收数据事件
        private void serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            //接收数据的内容在这里
            serialPort.ReadByte();  //读取数据，自己处理
        }
        /// <summary>
        /// 写数据的方法
        /// </summary>
        /// <param name="byteDate"></param>
        private void WriteDate(byte[] byteDate)
        {
            serialPort.Write(byteDate,0,byteDate.Length);
        }
大概写了一个，看看吧，基本的操作都有，自己看着学习下

Answer 4

默认记得是8N1,9600。。有些忘了，你在new SerialPort后面打个断点看看。。如果不会，劝你还是从基础学起。。