添加项目文件。

ViewModels/MainViewModel.cs

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+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using System;
+using System.Collections.ObjectModel;
+using System.Threading.Tasks;
+using System.Windows.Threading;
+using TabletTester2025.Models;
+using TabletTester2025.Services;
+
+namespace TabletTester2025.ViewModels
+{
+    public partial class MainViewModel : ObservableObject
+    {
+        private readonly IPlcService _plc;
+        private readonly DatabaseService _db;
+        private readonly ExcelExportService _excel;
+        private readonly AlarmService _alarm;
+        private readonly PlcConfiguration _plcConfig;
+        private DispatcherTimer _timer;
+
+        [ObservableProperty] private string _plcStatus = "断开";
+        [ObservableProperty] private string _currentTime;
+        [ObservableProperty] private string _globalAlarm;
+
+        public ObservableCollection<StationViewModel> Stations { get; }
+
+        public IAsyncRelayCommand ExportAllCommand { get; }
+
+        public MainViewModel(IPlcService plc, DatabaseService db, ExcelExportService excel, AlarmService alarm, PlcConfiguration plcConfig)
+        {
+            _plc = plc;
+            _db = db;
+            _excel = excel;
+            _alarm = alarm;
+            _plcConfig = plcConfig;
+
+            _alarm.PropertyChanged += (s, e) => { if (e.PropertyName == nameof(AlarmService.CurrentAlarm)) GlobalAlarm = _alarm.CurrentAlarm; };
+
+            Stations = new ObservableCollection<StationViewModel>();
+            for (int i = 1; i <= 3; i++)
+                Stations.Add(new StationViewModel(i, _plc, _plcConfig, _db, _excel, _alarm));
+
+            ExportAllCommand = new AsyncRelayCommand(ExportAllAsync);
+
+            _timer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(500) };
+            _timer.Tick += OnTimerTick;
+            _ = ConnectToPlc();
+            _timer.Start();
+        }
+
+        private async Task ConnectToPlc()
+        {
+            try { await _plc.ConnectAsync(); PlcStatus = "已连接"; }
+            catch { PlcStatus = "连接失败"; }
+        }
+
+        private async void OnTimerTick(object sender, EventArgs e)
+        {
+            CurrentTime = DateTime.Now.ToString("HH:mm:ss");
+            if (PlcStatus != "已连接") return;
+            foreach (var station in Stations)
+                await station.UpdateRealTimeData();
+        }
+
+        private async Task ExportAllAsync()
+        {
+            var batches = _db.GetBatches(null, 1000);
+            string path = System.IO.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), $"全工位报告_{DateTime.Now:yyyyMMddHHmmss}.xlsx");
+            _excel.ExportToExcel(batches, path);
+            System.Windows.MessageBox.Show($"报告已导出到：{path}");
+        }
+    }
+}