更新2026

ViewModels/MainViewModel.cs

@@ -18,6 +18,8 @@ namespace TabletTester2025.ViewModels
         private readonly AlarmService _alarm;
         private readonly PlcConfiguration _plcConfig;
         private DispatcherTimer _timer;
+        private bool _isConnecting;
+        private bool _isUpdatingRealtime;
 
 
 
@@ -48,7 +50,7 @@ namespace TabletTester2025.ViewModels
 
             ExportAllCommand = new AsyncRelayCommand(ExportAllAsync);
 
-            _timer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(500) };
+            _timer = new DispatcherTimer { Interval = TimeSpan.FromSeconds(1) };
             _timer.Tick += OnTimerTick;
             _ = ConnectToPlc();
             _timer.Start();
@@ -73,15 +75,53 @@ namespace TabletTester2025.ViewModels
 
         private async Task ConnectToPlc()
         {
-            try { await _plc.ConnectAsync(); PlcStatus = "已连接"; }
-            catch { PlcStatus = "连接失败"; }
+            if (_isConnecting)
+                return;
+
+            try
+            {
+                _isConnecting = true;
+                PlcStatus = "连接中";
+                await _plc.ConnectAsync();
+                PlcStatus = _plc.IsConnected ? "已连接" : "连接失败";
+            }
+            catch
+            {
+                PlcStatus = "连接失败";
+            }
+            finally
+            {
+                _isConnecting = false;
+            }
         }
 
         private async void OnTimerTick(object sender, EventArgs e)
         {
             CurrentTime = DateTime.Now.ToString("HH:mm:ss");
-            if (PlcStatus != "已连接") return;
-            await Tester.UpdateRealTimeData();
+
+            if (!_plc.IsConnected)
+            {
+                await ConnectToPlc();
+                return;
+            }
+
+            PlcStatus = "已连接";
+            if (_isUpdatingRealtime)
+                return;
+
+            try
+            {
+                _isUpdatingRealtime = true;
+                await Tester.UpdateRealTimeData();
+            }
+            catch
+            {
+                PlcStatus = "连接失败";
+            }
+            finally
+            {
+                _isUpdatingRealtime = false;
+            }
         }
 
         private async Task ExportAllAsync()