▶ 界面：
▶ 实现：
using System; using System.IO.Ports; using System.Windows.Forms; using System.Threading; namespace SerialPort_Exp_1 { public partial class Form1 : Form { bool _port_is_open = false; SerialPort sp = null; public Form1() { InitializeComponent(); this.MaximizeBox = false; this.MinimizeBox = false; this.AutoSizeMode = AutoSizeMode.GrowAndShrink; } private void Form1_Load(object sender, EventArgs e) { //串口号预加载 for (int i = 0; i < 10; i++) { serialport_cbx.Items.Add("COM" + (i + 1)); } serialport_cbx.SelectedIndex = 0; //校验位预加载 parity_cbx.Items.Add("无"); parity_cbx.Items.Add("奇校验"); parity_cbx.Items.Add("偶校验"); parity_cbx.SelectedIndex = 0; //波特率预加载 baudrate_cbx.Items.Add(1200); baudrate_cbx.Items.Add(3400); baudrate_cbx.Items.Add(4800); baudrate_cbx.Items.Add(9600); baudrate_cbx.Items.Add(19200); baudrate_cbx.Items.Add(38400); baudrate_cbx.Items.Add(43000); baudrate_cbx.Items.Add(56000); baudrate_cbx.Items.Add(57600); baudrate_cbx.Items.Add(115200); baudrate_cbx.SelectedIndex = 3; //数据位预加载 databits_cbx.Items.Add(5); databits_cbx.Items.Add(6); databits_cbx.Items.Add(7); databits_cbx.Items.Add(8); databits_cbx.SelectedIndex = 2; //停止位预加载 stopbits_cbx.Items.Add(0); stopbits_cbx.Items.Add(1); stopbits_cbx.Items.Add(1.5); stopbits_cbx.Items.Add(2); stopbits_cbx.SelectedIndex = 1; } ///检测可用端口 private void check_port_button_Click(object sender, EventArgs e) { ///可用串口检测 bool com_existence = false; //清除当前所有串口选项 serialport_cbx.Items.Clear(); for(int i = 0; i < 10; i++) { try { var sp = new SerialPort("COM" + (i + 1)); sp.Open(); sp.Close(); serialport_cbx.Items.Add("COM" + (i + 1)); com_existence = true; } catch(Exception) { continue; } } if (com_existence) { serialport_cbx.SelectedIndex = 0; } else { MessageBox.Show("未发现可用串口！", "错误提示"); } } ///检测待发送的数据是否为空 private bool checkSendData() { if (send_textbox.Text.Trim() == "") return false; return true; } ///检测串口参数是否全部配置(开启端口前测试) private bool checkPortSetting() { if (serialport_cbx.Text.Trim() == "") return false; if (parity_cbx.Text.Trim() == "") return false; if (baudrate_cbx.Text.Trim() == "") return false; if (databits_cbx.Text.Trim() == "") return false; if (stopbits_cbx.Text.Trim() == "") return false; return true; } ///端口开启 private void open_port_button_Click(object sender, EventArgs e) { if (_port_is_open==false) { if (!checkPortSetting()) { MessageBox.Show("串口未正确配置！", "错误提示"); return; } try { _port_is_open = true; setPortProperty(); //转换窗口参数 sp.Open(); this.Invoke(new Action(() => { open_port_button.Text = "关闭端口"; })); serialport_cbx.Enabled = false; parity_cbx.Enabled = false; baudrate_cbx.Enabled = false; databits_cbx.Enabled = false; stopbits_cbx.Enabled = false; check_port_button.Enabled = false; } catch (Exception) { _port_is_open = false; MessageBox.Show("串口已被占用!", "错误提示"); } } else { try { _port_is_open = false; sp.Close(); this.Invoke(new Action(() => { open_port_button.Text = "开启端口"; })); serialport_cbx.Enabled = true; parity_cbx.Enabled = true; baudrate_cbx.Enabled = true; databits_cbx.Enabled = true; stopbits_cbx.Enabled = true; check_port_button.Enabled = true; } catch (Exception ex) { MessageBox.Show(ex.Message.ToString(), "错误提示"); } } //接收事件绑定 sp.DataReceived += new SerialDataReceivedEventHandler(spDataReceived); } ///转换窗口串口属性 private void setPortProperty() { sp = new SerialPort(); sp.PortName = serialport_cbx.Text.Trim(); sp.DataBits = Convert.ToInt32(databits_cbx.Text.Trim()); sp.BaudRate = Convert.ToInt32(baudrate_cbx.Text.Trim()); //转换停止位 float stop_bits = Convert.ToSingle(stopbits_cbx.Text.Trim()); if (stop_bits == 0) { sp.StopBits = StopBits.None; } else if(stop_bits == 1) { sp.StopBits = StopBits.One; } else if(stop_bits == 1.5) { sp.StopBits = StopBits.OnePointFive; } else if(stop_bits == 2) { sp.StopBits = StopBits.Two; } else { sp.StopBits = StopBits.One; } //转换奇偶校验位 string parity = parity_cbx.Text.Trim(); if (parity == "无") { sp.Parity = Parity.None; } else if(parity == "奇校验") { sp.Parity = Parity.Odd; } else { sp.Parity = Parity.Even; } } //数据接收事件(接收字符) private void spDataReceived(object sender,SerialDataReceivedEventArgs e) { Thread.Sleep(200); this.Invoke(new Action(()=> { string rec_str = ""; int bytes_count = sp.BytesToRead; byte[] byte_list = new byte[bytes_count]; sp.Read(byte_list, 0, bytes_count); foreach (var i in byte_list) { rec_str += (char)i; } receive_textbox.Text += rec_str; sp.DiscardInBuffer(); //丢弃接收缓冲区数据 })); } private void send_button_Click(object sender, EventArgs e) { if (_port_is_open) { try { sp.WriteLine(send_textbox.Text.Trim()); } catch (Exception) { MessageBox.Show("发送数据时出现错误！", "错误提示"); } } else { MessageBox.Show("端口未开启！", "错误提示"); return; } if (!checkSendData()) { MessageBox.Show("发送数据不可为空！", "错误提示"); } } private void clear_button_Click(object sender, EventArgs e) { send_textbox.Clear(); } } }