调试数据

头罩视野slove/头罩视野/Views/PageTest.xaml.cs

@@ -22,7 +22,8 @@ namespace 头罩视野.Views
 {
     public partial class PageTest : Page
     {
-
+        /// 只加这一个变量
+        private CancellationTokenSource? _cts;    
         private IModbusMaster _modbusMaster => ModbusResourceManager.Instance.ModbusMaster;
         DispatcherTimer _timer;
         DataChange c = new DataChange();
@@ -157,12 +158,7 @@ namespace 头罩视野.Views
             TestDataStore.AddNewRecord(data);
             _lastRecord = data;
         }
-        private void Page_Unloaded(object sender, RoutedEventArgs e)
-        {
-            testTimer?.Stop();
-            _timer?.Stop();
 
-        }
         //停止btn
         private void Button_Click_Stop(object sender, RoutedEventArgs e)
         {
@@ -249,7 +245,12 @@ namespace 头罩视野.Views
         private async Task ReadAndUpdateFloatAsync(int address, int length, System.Windows.Controls.TextBox control, string format, string unit)
         {
             try
-            {
+            {    // 1. 页面销毁时直接退出，不执行
+                if (_cts?.IsCancellationRequested == true) return;
+
+                // 2. 关键：判断对象为空就直接返回，不执行
+                if (_modbusMaster == null) return;
+
                 ushort[] registers = await Task.Run(async () =>
                    await _modbusMaster!.ReadHoldingRegistersAsync(1, (ushort)address, (ushort)length)
                 );
@@ -409,6 +410,14 @@ namespace 头罩视野.Views
             c = new DataChange();
 
         }
+        private void Page_Unloaded(object sender, RoutedEventArgs e)
+        {
+            testTimer?.Stop();
+            _timer?.Stop();
+            _cts?.Cancel();
+            _cts = null;
+
+        }
     }
 }