界面的布局：
需要注意的是在波特率的下来框中要设置选择的参数列表，可以通过下面截图的方式添加：
实现的源代码如下，注意；：控件的名字编号，要根据自己的界面布局做出修改。这里主要是实现串口控件的使用和基本的逻辑思路。
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using System.IO.Ports; using System.Runtime.InteropServices;//DllImport是System.Runtime.InteropServices命名空间下的一个属性类，其功能是提供从非托管DLL导出的函数的必要调用信息。 namespace comport1 { public partial class Form1 : Form { [DllImport("kernel32")] private static extern long WritePrivateProfileString(string section, string key, string val, string filepath); [DllImport("kernel32")] private static extern int GetPrivateProfileString(string section, string key, string def, StringBuilder retVal, int size, string filepath); string FileName = System.AppDomain.CurrentDomain.BaseDirectory + "config.ini"; StringBuilder temp = new StringBuilder(255);//存储读出ini文件的变量 string CurrentPortName; public Form1() { InitializeComponent(); System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false;//此时禁用了所有的控件合法性检查。没有这句代码，运行的时候就会报出错误：从不是创建控件“textBox1”的线程访问它。 this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(Form1_FormClosing);//注册一个窗口关闭的处理函数 } private void Form1_FormClosing(object sender, EventArgs e) { WritePrivateProfileString("PortData", "PortName", CurrentPortName, FileName); } private void Form1_Load(object sender, EventArgs e) { for (int i = 0; i < 50; i++) { comboBox1.Items.Add("COM" + i.ToString()); } GetPrivateProfileString("PortData", "PortName", "COM1", temp, 255, FileName); comboBox1.Text = temp.ToString(); comboBox2.Text = "9600"; button4.Enabled = true; button5.Enabled = false; serialPort1.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(port_DataReceived);//必须手动添加时间处理函数 } private void port_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)//串口数据接收事件 { if (radioButton4.Checked)//receeive mode:char mode { string str = serialPort1.ReadExisting();//string read textBox1.AppendText(str);//add context } else { byte data; data = (byte)serialPort1.ReadByte(); string str = Convert.ToString(data, 16).ToUpper(); textBox1.AppendText("0x" + (str.Length == 1 ? "0" + str : str) + " "); } } public string ser { get; set; } private void button4_Click(object sender, EventArgs e) { try { serialPort1.PortName = comboBox1.Text; serialPort1.BaudRate = Convert.ToInt32(comboBox2.Text);//十进制数据转换 serialPort1.Open(); CurrentPortName = comboBox1.Text; button4.Enabled = false; button5.Enabled = true; } catch { MessageBox.Show("serial error", "error"); } } private void button5_Click(object sender, EventArgs e) { try { serialPort1.Close(); button4.Enabled = true; button5.Enabled = false; } catch (Exception err) { } } private void button3_Click(object sender, EventArgs e) { byte[] Data = new byte[1]; if (serialPort1.IsOpen) { if (!radioButton1.Checked) { try { serialPort1.WriteLine(textBox2.Text); } catch { MessageBox.Show("serial port write data error", "error"); serialPort1.Close(); button4.Enabled = true; button5.Enabled = false; } } else { for (int i = 0; i < (textBox2.Text.Length - textBox2.Text.Length % 2) / 2; i++) { Data[0] = Convert.ToByte(textBox2.Text.Substring(i * 2, 2), 16); serialPort1.Write(Data, 0, 1); } if (textBox2.Text.Length % 2 != 0) { Data[0] = Convert.ToByte(textBox2.Text.Substring(textBox2.Text.Length - 1, 1), 16); serialPort1.Write(Data, 0, 1); } } } } private void textBox1_TextChanged(object sender, EventArgs e) { //textBox1.ScrollToCaret(); } //以下的逻辑主要是扫描出当前PC上面可以被打开的串口的串口号，可以有多个能够被打开的串口号，并显示在MyBox下拉菜单列表中 //参数：MyPort是上位机的串口名字，MyBox是显示能够被打开串口的串口号列表。 /* private void autoSerialPortNum(SerialPort MyPort, ComboBox MyBox) { string Buffer; MyBox.Items.Clear();//清理下拉菜单 for (int i = 0; i < 30; i++)//扫描的串口号范围 { try { Buffer = "COM" + i.ToString(); MyPort.PortName = Buffer; MyPort.Open();//打开当前循环的串口号，如果能够被打开，就继续执行下面的，如果打开失败，就继续for循环 MyBox.Items.Add(Buffer); MyPort.Close(); } catch { } } } */ } }以下逻辑实现上位机扫描能够被打开的串口号：
类SerialPort需要在文件头定义如下的命名空间。
using System.IO.Port;
private void autoSerialPortNum(SerialPort MyPort, ComboBox MyBox) { string Buffer; MyBox.Items.Clear();//清理下拉菜单 for (int i; i < 30; i++)//扫描的串口号范围 { try { Buffer = "COM" + i.ToString(); MyPort.PortName = Buffer; MyPort.Open();//打开当前循环的串口号，如果能够被打开，就继续执行下面的，如果打开失败，就继续for循环 MyBox.Items.Add(Buffer); MyPort.Close(); } catch { } } }
