C# 005 串口通信 串口扫描 开关指示灯

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

namespace 串口通信3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (serialPort1.IsOpen)  //打开串口
            {
                ovalShape1.FillColor = Color.Gray;
                try
                {
                    serialPort1.Close();
                }
                catch { }           //确保万无一失
                button2.Text = "打开串口";
            }
            else
            {
                try
                {
                    serialPort1.PortName = comboBox1.Text;//端口号
                    serialPort1.Open();
                    ovalShape1.FillColor = Color.Green;
                    button2.Text = "关闭串口";
                }
                catch
                {
                    MessageBox.Show("串口打开失败", "错误");
                }
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            ovalShape1.FillColor = Color.Gray;
            SeachAddAddSerialToComboBox(serialPort1, comboBox1);
        }

        private void SeachAddAddSerialToComboBox(SerialPort MyPort, ComboBox MyBox)
        {                                       //将可用端口号添加到ComboBox
            //string[] MyString = new string[20]; //最多可容纳20个，太多会影响调试效率
            string Buffer;                      // 缓存
            MyBox.Items.Clear();                //清空ComboBox内容
            //int count = 0;
            for (int i = 1; i < 30; i++)
            {
                try
                {
                    Buffer = "COM" + i.ToString();
                    MyPort.PortName = Buffer;
                    MyPort.Open();
                    //MyString[count] = Buffer;
                    MyBox.Items.Add(Buffer);
                    MyPort.Close();
                    //count++;
                }
                catch{
                    //count--;
                }
            }

            //MyBox.Text = MyString[0];//初始化
        }

        private void WriteByteToSerialPort(byte data)//单字节写入串口
        {
            byte[] Buffer = new byte[2] { 0x00, data };//定义数组
            if (serialPort1.IsOpen)
            {
                try
                {
                    serialPort1.Write(Buffer, 0, 2);//写数据
                }
                catch
                {
                    MessageBox.Show("串口数据发送出错，请检查。", "错误");
                }
            }
            
        }

    }
}