效果图：
====================== 代码段 =================================
public partial class SerialPortEx : Form { private SerialPort sp = new SerialPort(); bool isOpen = false; // bool isSetProperty = false; //属性设置标志 bool isHex = false; //十六进制显示标志 bool isFileOpen = false; string RecvDataText = null; public SerialPortEx() { InitializeComponent(); } private void SerialPort_Load(object sender, EventArgs e) //串口列表 { for (int i = 0; i < 6; i++) { cbxComPort.Items.Add("COM" + (i + 1).ToString()); } cbxComPort.SelectedIndex = 0; //设置串口初始值 //列出常用的波特率表 cbxBaudRate.Items.Add("1200"); cbxBaudRate.Items.Add("2400"); cbxBaudRate.Items.Add("4800"); cbxBaudRate.Items.Add("9600"); cbxBaudRate.Items.Add("19200"); cbxBaudRate.Items.Add("38400"); cbxBaudRate.SelectedIndex = 5; //列出停止位 cbxStopBits.Items.Add("0"); cbxStopBits.Items.Add("1"); cbxStopBits.Items.Add("1.5"); cbxStopBits.Items.Add("2"); cbxStopBits.SelectedIndex = 1; //列出数据位 cbxDataBits.Items.Add("8"); cbxDataBits.Items.Add("7"); cbxDataBits.Items.Add("6"); cbxDataBits.Items.Add("5"); cbxDataBits.SelectedIndex = 1; //列出奇偶校验位 cbxParity.Items.Add("无"); cbxParity.Items.Add("奇校验"); cbxParity.Items.Add("偶校验"); cbxParity.SelectedIndex = 0; //默认char显示 rbnChar.Checked = true; } private void textBox1_TextChanged(object sender, EventArgs e) { } private void btnCheckCom_Click(object sender, EventArgs e) //检测Com口 { bool comExist = 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()); comExist = true; } catch (Exception) { continue; } } if (comExist) { cbxComPort.SelectedIndex = 0; //默认第一个 } else { MessageBox.Show("没有找到任何可用串口", "错误提示"); } } //串口检测 界面初始化 private bool CheckPortSetting() //检测串口是否初始化 { 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 CheckSendDate() //检测发送数据是否为空 { if (tbxSentData.Text.Trim() == "") return false; return true; } private void SetPortProperty() // { sp = new SerialPort(); sp.PortName = cbxComPort.Text.Trim(); //设置串口名 sp.BaudRate = Convert.ToInt32(cbxBaudRate.Text.Trim()); //设置串口波特率 int f = (int)Convert.ToSingle(cbxStopBits.Text.Trim()) * 10; //设置停止位 switch (f) { case 0: sp.StopBits = StopBits.None; break; case 10: sp.StopBits = StopBits.One; break; case 15: sp.StopBits = StopBits.OnePointFive; break; case 20: sp.StopBits = StopBits.Two; break; default: sp.StopBits = StopBits.None; break; } sp.DataBits = Convert.ToInt16(cbxDataBits.Text.Trim()); //设置数据位 string parityType = cbxParity.Text.Trim(); //设置奇偶校验 switch (parityType) { case "无": sp.Parity = Parity.None; break; case "奇校验": sp.Parity = Parity.Odd; break; case "偶校验": sp.Parity = Parity.Even; break; default: sp.Parity = Parity.None; break; } sp.ReadTimeout = -1; //超时读取时间 sp.RtsEnable = true; // 指示本设备准备好可接收数据 //定义Data Received事件，当串口收到数据后出发事件 sp.DataReceived += new SerialDataReceivedEventHandler(sp_DataReceived); } private void btnOpenCom_Click(object sender, EventArgs e) { if (isOpen == false) { if (!CheckPortSetting()) //检测串口设置 { MessageBox.Show("串口未设置", "错误提示"); return; } if (isSetProperty == false) // 检测 { SetPortProperty(); isSetProperty = true; } try //打开串口 { sp.Open(); isOpen = true; btnOpenCom.Text = "关闭串口"; //串口打开后相关的串口设置按钮不再可选择 cbxBaudRate.Enabled = false; cbxComPort.Enabled = false; cbxDataBits.Enabled = false; cbxParity.Enabled = false; cbxStopBits.Enabled = false; } catch (Exception) { //失败后设置 isSetProperty = false; isOpen = false; MessageBox.Show("串口无效或已经被占用！", "错误提示"); } } else { sp.Close(); isOpen = false; isSetProperty = false; btnOpenCom.Text = "打开串口"; //重置选择按钮有效 cbxBaudRate.Enabled = true; cbxComPort.Enabled = true; cbxDataBits.Enabled = true; cbxParity.Enabled = true; cbxStopBits.Enabled = true; } } private void btnSend_Click(object sender, EventArgs e) { try { System.Text.UTF8Encoding utf8 = new System.Text.UTF8Encoding(); byte[] writeBytes = utf8.GetBytes(tbxSentData.Text); //byte[] writeBytes11 = new Byte[data1.length]; // sp.Write(writeBytes,0,writeBytes.Length); //发送数据内容 } catch (Exception) { MessageBox.Show("发送数据时发生错误！", "错误提示"); return; } } private void sp_DataReceived(object sender, EventArgs e) { System.Threading.Thread.Sleep(100); //延迟100ms等待接收完成数据 this.Invoke((EventHandler)( delegate { if (isHex == false) { System.Text.UTF8Encoding utf8 = new System.Text.UTF8Encoding();// 显示汉字与字符 Byte[] readBytes = new Byte[sp.BytesToRead]; sp.Read(readBytes, 0, readBytes.Length); string decodedString = utf8.GetString(readBytes); tbxRecvData.Text += decodedString; } else { } } )); } }
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未完待续：
添加接收信息换行，中文字符处理....