使用新框架与技术代替旧框架与技术，实现涂装车间后道标签扫码程序

RIZO_Application/Modules/RIZO_Application.Modules.ModuleName/ViewModels/ScanControlViewModel.cs

@@ -0,0 +1,164 @@
+using System;
+using System.Threading.Tasks;
+using System.Windows.Media;
+using Prism.Events;
+using Prism.Regions;
+using RIZO_Application.Core;
+using RIZO_Application.Core.Mvvm;
+using RIZO_Application.Infrastructure.Model;
+using RIZO_Helper.Tools;
+using System.Windows;
+using System.IO.Ports;
+
+namespace RIZO_Application.Modules.ModuleName.ViewModels
+{
+    public class ScanControlViewModel : RegionViewModelBase, IDisposable
+    {
+        private readonly IEventAggregator _eventAggregator;
+        private ComScanHelper _scanHelper;
+        private bool _isDisposed;
+        private bool _isConnected;
+        // 串口连接状态属性
+        public bool IsConnected
+        {
+            get => _isConnected;
+            set
+            {
+                if (SetProperty(ref _isConnected, value))
+                {
+                    // 通知依赖属性更新
+                    RaisePropertyChanged(nameof(ConnectionStatusText));
+                    RaisePropertyChanged(nameof(ConnectionStatusForeground));
+                }
+            }
+        }
+        // 串口连接状态文字描述
+        public string ConnectionStatusText
+        {
+            get => IsConnected ? "扫码枪已连接" : "扫码枪未连接";
+        }
+
+        // 串口连接状态文字颜色
+        public Brush ConnectionStatusForeground
+        {
+            get => IsConnected ? Brushes.Green : Brushes.Red;
+        }
+        public ScanControlViewModel(
+            IRegionManager regionManager,
+            IEventAggregator eventAggregator)
+            : base(regionManager)
+        {
+
+            _eventAggregator = eventAggregator;
+            IsConnected = false; // 初始状态为未连接
+            InitializeScanHelperAsync().ConfigureAwait(false);
+        }
+
+        private async Task InitializeScanHelperAsync()
+        {
+            try
+            {
+                await StartComScan();
+            }
+            catch (Exception ex)
+            {
+                _eventAggregator.GetEvent<SystemLogEvent>().Publish($"串口初始化异常: {ex.Message}");
+            }
+        }
+
+        public async Task StartComScan()
+        {
+            if (_isDisposed)
+                throw new ObjectDisposedException(nameof(ScanControlViewModel));
+
+            string comName = "COM1";
+            int baudRate = 9600;
+            if (SerialConfigs.Current != null)
+            {
+                comName = SerialConfigs.Current.ComName ?? string.Empty;
+                baudRate = SerialConfigs.Current.BaudRate ?? 9600;
+            }
+
+            _eventAggregator.GetEvent<SystemLogEvent>().Publish($"串口扫码枪初始化……串口：{comName} 波特率：{baudRate}");
+
+            // 安全地释放现有实例
+            await DisposeScanHelperAsync();
+
+            _scanHelper = new ComScanHelper(comName, baudRate);
+            _scanHelper.DataReceived += HandleMessage;
+            _scanHelper.ErrorOccurred += HandleError;
+
+            if (await _scanHelper.OpenAsync())
+            {
+                _eventAggregator.GetEvent<SystemLogEvent>().Publish($"串口扫码初始化完成");
+                IsConnected = true; // 连接成功
+            }
+            else
+            {
+                MessageBox.Show($"打开串口失败");
+                _eventAggregator.GetEvent<SystemLogEvent>().Publish($"串口打开失败");
+                IsConnected = false; // 连接失败
+            }
+        }
+
+        private void HandleError(object sender, Exception ex)
+        {
+            _eventAggregator.GetEvent<SystemLogEvent>().Publish($"串口通信错误: {ex.Message}");
+            IsConnected = false; // 发生错误时断开连接
+        }
+
+        // 定义事件处理方法
+        private void HandleMessage(object sender, string labelCode)
+        {
+            // 打印接收到的消息信息
+            //_eventAggregator.GetEvent<SystemLogEvent>().Publish($"收到串口信息: {labelCode}");
+            _eventAggregator.GetEvent<ScanEvent>().Publish(labelCode);
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        private async void Dispose(bool disposing)
+        {
+            if (_isDisposed)
+                return;
+
+            _isDisposed = true;
+
+            if (disposing)
+            {
+                await DisposeScanHelperAsync();
+            }
+        }
+
+        private async Task DisposeScanHelperAsync()
+        {
+            if (_scanHelper != null)
+            {
+                try
+                {
+                    _scanHelper.DataReceived -= HandleMessage;
+                    _scanHelper.ErrorOccurred -= HandleError;
+                    await _scanHelper.DisposeAsync();
+                }
+                catch (Exception ex)
+                {
+                    _eventAggregator.GetEvent<SystemLogEvent>().Publish($"释放串口资源异常: {ex.Message}");
+                }
+                finally
+                {
+                    _scanHelper = null;
+                    IsConnected = false; // 释放资源后断开连接
+                }
+            }
+        }
+
+        ~ScanControlViewModel()
+        {
+            Dispose(false);
+        }
+    }
+}