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   源码介绍

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace BXHSerialPort
{
    public partial class frmSerialPort : Form
    {
        private SerialPort ComDevice = new SerialPort();
        private int time = 150;
        public frmSerialPort()
        {
            InitializeComponent();
            this.init();
        }
        public void init()
        {
            btnSend.Enabled = false;
            cbbComList.Items.AddRange(SerialPort.GetPortNames());
            if (cbbComList.Items.Count > 0)
            {
                cbbComList.SelectedIndex = 0;
            }
            cbbBaudRate.SelectedIndex = 5;
            cbbDataBits.SelectedIndex = 0;
            cbbParity.SelectedIndex = 0;
            cbbStopBits.SelectedIndex = 0;
            cbBox_time.SelectedIndex = 3;
            pictureBox1.BackgroundImage = Properties.Resources.red;
            //ComDevice.DataReceived  = new SerialDataReceivedEventHandler(Com_DataReceived);//绑定事件
        }

        /// <summary>
        /// 打开串口
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnOpen_Click(object sender, EventArgs e)
        {
            if (cbbComList.Items.Count <= 0)
            {
                MessageBox.Show("没有发现串口,请检查线路！");
                return;
            }

            if (ComDevice.IsOpen == false)
            {
                ComDevice.PortName = cbbComList.SelectedItem.ToString();
                //ComDevice.BaudRate = Convert.ToInt32(cbbBaudRate.SelectedItem.ToString());
                ComDevice.BaudRate = Convert.ToInt32(cbbBaudRate.Text.ToString());
                ComDevice.Parity = (Parity)Convert.ToInt32(cbbParity.SelectedIndex.ToString());
                ComDevice.DataBits = Convert.ToInt32(cbbDataBits.SelectedItem.ToString());
                ComDevice.StopBits = (StopBits)Convert.ToInt32(cbbStopBits.SelectedItem.ToString());
                time = Convert.ToInt32(cbBox_time.Text.Trim());
                try
                {
                    ComDevice.DataReceived  = new SerialDataReceivedEventHandler(Com_DataReceived);
                    ComDevice.Open();
                    btnSend.Enabled = true;
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    return;
                }
                btnOpen.Text = "关闭串口";
                pictureBox1.BackgroundImage = Properties.Resources.green;
            }
            else
            {
                try
                {
                    ComDevice.DataReceived -= new SerialDataReceivedEventHandler(Com_DataReceived);//取消绑定COM接收
                    Thread.Sleep(1000);
                    ComDevice.Close();
                    btnSend.Enabled = false;
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                btnOpen.Text = "打开串口";
                pictureBox1.BackgroundImage = Properties.Resources.red;
            }
            cbbComList.Enabled = !ComDevice.IsOpen;
            cbbBaudRate.Enabled = !ComDevice.IsOpen;
            cbbParity.Enabled = !ComDevice.IsOpen;
            cbbDataBits.Enabled = !ComDevice.IsOpen;
            cbbStopBits.Enabled = !ComDevice.IsOpen;
            cbBox_time.Enabled = !ComDevice.IsOpen;
        }

        /// <summary>
        /// 关闭串口
        /// </summary>
        public void ClearSelf()
        {
            if (ComDevice.IsOpen)
            {
                ComDevice.Close();
            }
        }

        /// <summary>
        /// 发送数据
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="data"></param>
        public bool SendData(byte[] data)
        {
            if (ComDevice.IsOpen)
            {
                try
                {
                    ComDevice.Write(data, 0, data.Length);//发送数据
                    return true;
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
            else
            {
                MessageBox.Show("串口未打开", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            return false;
        }

        /// <summary>
        /// 发送数据button事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnSend_Click(object sender, EventArgs e)
        {
            byte[] sendData = null;

            if (rbtnSendHex.Checked)
            {
                sendData = strToHexByte(txtSendData.Text.Trim());
            }
            else if (rbtnSendASCII.Checked)
            {
                sendData = Encoding.ASCII.GetBytes(txtSendData.Text.Trim());
            }
            else if (rbtnSendUTF8.Checked)
            {
                sendData = Encoding.UTF8.GetBytes(txtSendData.Text.Trim());
            }
            else if (rbtnSendUnicode.Checked)
            {
                sendData = Encoding.Unicode.GetBytes(txtSendData.Text.Trim());
            }
            else
            {
                sendData = Encoding.ASCII.GetBytes(txtSendData.Text.Trim());
            }

            if (this.SendData(sendData))//发送数据成功计数
            {
                lblSendCount.Invoke(new MethodInvoker(delegate
                {
                    lblSendCount.Text = (int.Parse(lblSendCount.Text)   txtSendData.Text.Length).ToString();
                }));
            }
            else
            {

            }
        }

        /// <summary>
        /// 字符串转换16进制字节数组
        /// </summary>
        /// <param name="hexString"></param>
        /// <returns></returns>
        private byte[] strToHexByte(string hexString)
        {
            hexString = hexString.Replace(" ", "");
            if ((hexString.Length % 2) != 0) hexString  = " ";
            byte[] returnBytes = new byte[hexString.Length / 2];
            for (int i = 0; i < returnBytes.Length; i  )
            returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2).Replace(" ",""), 16);
            return returnBytes;
        }

        /// <summary>
        /// 接收数据
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Com_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            //等待缓冲区数据
            Thread.Sleep(time);

            byte[] ReDatas = new byte[ComDevice.BytesToRead];

            ComDevice.Read(ReDatas, 0, ReDatas.Length);//读取数据
            
            //丢弃接收缓冲区数据
            ComDevice.DiscardInBuffer();

            this.AddData(ReDatas);//输出数据
        }
       
        /// <summary>
        /// 添加数据
        /// </summary>
        /// <param name="data">字节数组</param>
        public void AddData(byte[] data)
        {
            if (rbtnHex.Checked)
            {
                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < data.Length; i  )
                {
                    sb.AppendFormat("{0:x2}"   " ", data[i]);
                }
                AddContent(sb.ToString().ToUpper());
            }
            else if (rbtnASCII.Checked)
            {
                AddContent(new ASCIIEncoding().GetString(data));
            }
            else if (rbtnUTF8.Checked)
            {
                AddContent(new UTF8Encoding().GetString(data));
            }
            else if (rbtnUnicode.Checked)
            {
                AddContent(new UnicodeEncoding().GetString(data));
            }
            else
            {}
          
            lblRevCount.Invoke(new MethodInvoker(delegate
            {
                lblRevCount.Text = (int.Parse(lblRevCount.Text)   data.Length).ToString();
            }));
        }


        /// <summary>
        /// 输入到显示区域
        /// </summary>
        /// <param name="content"></param>
        private void AddContent(string content)
        {
            this.BeginInvoke(new MethodInvoker(delegate
            {
                if(chkAutoLine.Checked && txtShowData.Text.Length>0)
                {
                    txtShowData.AppendText("\r\n");
                }
                txtShowData.AppendText(content);
            }));
        }

       
        /// <summary>
        /// 清空接收区
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnClearRev_Click(object sender, EventArgs e)
        {
            txtShowData.Clear();
        }

        /// <summary>
        /// 清空发送区
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnClearSend_Click(object sender, EventArgs e)
        {
            txtSendData.Clear();
        }
    }
}