bird_tool/bird_tool/bird_tool.cs

using System;
using System.IO.Ports;
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;
using System.Net;
using System.Data.SqlClient;
using System.Runtime.Serialization;
using MySql.Data.MySqlClient;
using System.Threading;
using System.Text.RegularExpressions;

using Excel = Microsoft.Office.Interop.Excel;

using NAudio.CoreAudioApi;


using Emgu.CV;
using Emgu.CV.Structure;


namespace Bird_tool
{
    public partial class bird_tool : Form
    {
        private SerialPort _uart = new SerialPort();//定义串口

        private BindingList<string> _portList = new BindingList<string>();
        private string _lastSelectedPort = ""; // 保存上次选择的串口

        // 是否加载了配置
        private bool flag_load_config = false;
        // 是否选择串口
        private bool flag_selected_serial = false;


        public bird_tool()
        {
            InitializeComponent();
            //serialTimer.Interval = 1000;
            //serialTimer.Enabled = true;
        }

        private void Log(string message)
        {
            System.Diagnostics.Debug.WriteLine(message);
        }

        
        private void Tool_load(object sender, EventArgs e)
        {
            SerialPort_Load();
        }

        private void SerialPort_Load()
        {
            // 设置ComboBox数据源
            el_serialList.DataSource = _portList;

            // 添加事件处理程序，用于保存当前选择
            el_serialList.SelectedIndexChanged += (s, ev) =>
            {
                if (el_serialList.SelectedItem != null)
                    _lastSelectedPort = el_serialList.SelectedItem.ToString();
            };

            // 初始加载串口列表
            RefreshPortList();
        }

        // 刷新串口列表并保持选择
        public void RefreshPortList()
        {
            // 获取当前选中的端口（如果尚未选择，则使用上次保存的值）
            string currentSelection = el_serialList.SelectedItem != null
                ? el_serialList.SelectedItem.ToString()
                : _lastSelectedPort;

            // 获取最新串口列表
            string[] newPorts = SerialPort.GetPortNames();

            // 检查是否有串口
            if (newPorts.Length == 0)
            {
                // 没有串口时的处理
                _portList.Clear();
                _portList.Add("");
                el_serialList.SelectedIndex = 0;
                return;
            }

            // 保存当前选择状态
            bool wasEmpty = string.IsNullOrEmpty(currentSelection);

            // 更新绑定列表
            _portList.Clear();

            // 添加空选项
            _portList.Add("");

            // 添加所有串口
            foreach (var port in newPorts)
            {
                _portList.Add(port);
            }

            // 尝试恢复之前的选中项
            if (!wasEmpty && _portList.Contains(currentSelection))
            {
                el_serialList.SelectedItem = currentSelection;
            }
            else
            {
                // 如果之前的选项不存在，选择第一个有效串口（非空）
                el_serialList.SelectedIndex = 0;
            }

            // 更新保存的选择
            if (el_serialList.SelectedItem != null)
                _lastSelectedPort = el_serialList.SelectedItem.ToString();
        }

        // 示例刷新按钮事件
        private void Evt_refresh(object sender, EventArgs e)
        {
            RefreshPortList();
        }

        private void el_serialList_SelectedIndexChanged(object sender, EventArgs e)
        {
            
        }
    }
}