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   源码介绍

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接受发送

using System;
using System.IO.Ports;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        SerialPort sp = null;
        bool isOpen = false;
        bool isSetProperty = false;
        //bool isHex = false;
        bool isHex = false;
        public Form1()
        {
            InitializeComponent();//窗口初始化
        }

        private void Form1_Load(object sender, System.EventArgs e)
        {
            this.MaximumSize = this.Size;
            this.MinimumSize = this.Size;
            this.MaximizeBox = false;
            for(int i = 0;i < 8;i  )
            {
                cbxCOMPort.Items.Add("COM"   (i   1).ToString());
            }
            cbxCOMPort.SelectedIndex = 0;

            cbxBaudRate.Items.Add("2400");
            cbxBaudRate.Items.Add("4800");
            cbxBaudRate.Items.Add("9600");
            cbxBaudRate.Items.Add("19200");
            cbxBaudRate.Items.Add("38400");
            cbxBaudRate.SelectedIndex = 2;

            cbxStopBits.Items.Add("0");
            cbxStopBits.Items.Add("1");
            cbxStopBits.Items.Add("1.5");
            cbxStopBits.Items.Add("2");
            cbxStopBits.SelectedIndex = 1;

            cbxDataBits.Items.Add("8");
            cbxDataBits.Items.Add("7");
            cbxDataBits.Items.Add("6");
            cbxDataBits.Items.Add("5");
            cbxDataBits.SelectedIndex = 0;

            cbxParity.Items.Add("无");
            cbxParity.Items.Add("奇校验");
            cbxParity.Items.Add("偶校验");
            cbxParity.SelectedIndex = 0;

            rbnChar.Checked = true;
        }

        private void btnCheckCOM_Click(object sender, System.EventArgs e)
        {
            bool comExistence = false;
            cbxCOMPort.Items.Clear();
            for(int i = 0;i<10;i  )
            {
                try
                {
                    SerialPort sp = new SerialPort("COM"   (i   1).ToString());
                    sp.Open();
                    sp.Close();
                    cbxCOMPort.Items.Add("COM"   (i   1).ToString());
                    comExistence = true;
                }
                catch (Exception)
                {
                    continue;
                }
                if (comExistence)
                {
                    cbxCOMPort.SelectedIndex = 0;//ListBox显示第一个添加的索引
                }
                else
                {
                    MessageBox.Show("没有找到可用串口！", "错误提示");
                }
            }
        }

        private bool CheckPortSetting()
        {
            if (cbxCOMPort.Text.Trim() == "") return false;
            if (cbxBaudRate.Text.Trim() == "") return false;
            if (cbxDataBits.Text.Trim() == "") return false;
            if (cbxParity.Text.Trim() == "") return false;
            if (cbxStopBits.Text.Trim() == "") return false;
            return true;
        }

        private bool CheckSendData()
        {
            if (tbxSendData.Text.Trim() == "") return false;
            return true;
        }

        private void SetPortProperty()
        {
            sp = new SerialPort();
            sp.PortName = cbxCOMPort.Text.Trim();
            sp.BaudRate = Convert.ToInt32(cbxBaudRate.Text.Trim());
            float f = Convert.ToSingle(cbxStopBits.Text.Trim());
            if (f == 0)
            {
                sp.StopBits = StopBits.None;
            }
            else if (f == 1.5)
            {
                sp.StopBits = StopBits.OnePointFive;
            }
            else if (f == 1)
            {
                sp.StopBits = StopBits.One;
            }
            else if (f == 2)
            {
                sp.StopBits = StopBits.Two;
            }
            else
            {
                sp.StopBits = StopBits.One;
            }

            sp.DataBits = Convert.ToInt16(cbxDataBits.Text.Trim());

            string s = cbxParity.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;
            }

            sp.ReadTimeout = -1;

            sp.RtsEnable = true;

            sp.DataReceived  = new SerialDataReceivedEventHandler(sp_DataReceived);
            
            if (rbnHex.Checked)
            {
                isHex = true;
            }
            else
            {
                isHex = false;
            }
        }

        //接收
        private void sp_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            byte[] ReceivedData = new byte[sp.BytesToRead];  //创建接收字节数组
            sp.Read(ReceivedData, 0, ReceivedData.Length);   //读取所接收到的数据
            AddData(ReceivedData);  //输出
        }

        //转码
        public void AddData(byte[] ReceivedData)
        {
            if (rbnHex.Checked)
            {
                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < ReceivedData.Length; i  )
                {
                    sb.AppendFormat("{0:x2}"   " ", ReceivedData[i]   "\r\n");
                }
                AddContent(sb.ToString().ToUpper()   "\r\n");
            }
            else
            {
                AddContent(new ASCIIEncoding().GetString(ReceivedData)   "\r\n");
            }
        }
        
        //输入到显示
        private void AddContent(string content)
        {
            BeginInvoke(new MethodInvoker(delegate
            {
                tbxRecvData.AppendText("");
                tbxRecvData.AppendText(content);
                sp.DiscardInBuffer();//丢弃接收缓冲区数据
            }));
        }

        private void btnCleanData_Click(object sender, EventArgs e)
        {
            tbxRecvData.Text = "";
            tbxSendData.Text = "";
        }

        private void btnSend_Click(object sender, EventArgs e)
        {
            if (isOpen)
            {
                try
                {
                    sp.WriteLine(tbxSendData.Text);
                }
                catch (Exception)
                {
                    MessageBox.Show("发送数据时发生错误！", "错误提示");
                    return;
                }
            }
            else
            {
                MessageBox.Show("串口未打开！","错误提示");
                return;
            }
            if (!CheckSendData())
            {
                MessageBox.Show("请输入要发送的数据！","错误提示");
                return;
            }
        }

        private void btnOpenCOM_Click(object sender, EventArgs e)
        {
            if (isOpen == false)
            {
                if (!CheckPortSetting())
                {
                    MessageBox.Show("串口未设置！", "错误提示");
                    return;
                }
                if (!isSetProperty)
                {
                    SetPortProperty();
                    isSetProperty = true;
                }
                try
                {
                    sp.Open();
                    isOpen = true;
                    btnOpenCOM.Text = "关闭串口";

                    cbxBaudRate.Enabled = false;
                    cbxCOMPort.Enabled = false;
                    cbxDataBits.Enabled = false;
                    cbxParity.Enabled = false;
                    cbxStopBits.Enabled = false;
                    rbnChar.Enabled = false;
                    rbnHex.Enabled = false;
                }
                catch (Exception)
                {
                    isSetProperty = false;
                    isOpen = false;
                    MessageBox.Show("串口无效或已被占用", "错误提示");
                }
            }
            else
            {
                try
                {
                    sp.Close();
                    isOpen = false;
                    isSetProperty = false;
                    btnOpenCOM.Text = "打开串口";

                    cbxBaudRate.Enabled = true;
                    cbxCOMPort.Enabled = true;
                    cbxDataBits.Enabled = true;
                    cbxParity.Enabled = true;
                    cbxStopBits.Enabled = true;
                    rbnChar.Enabled = true;
                    rbnHex.Enabled = true;
                }
                catch (Exception)
                {
                    MessageBox.Show("关闭串口时发生错误", "错误提示");
                }             
            }
        }        
    }
}