完成打开导入OPC变量对话框自动连接服务器

ViewModels/Dialogs/OpcUaImportDialogViewModel.cs

@@ -37,6 +37,8 @@ public partial class OpcUaImportDialogViewModel : ObservableObject
     {
         OpcUaNodes = new ObservableCollection<OpcUaNode>();
         SelectedNodeVariables = new ObservableCollection<VariableData>();
+        // Automatically connect when the ViewModel is created
+        _ = Connect().ConfigureAwait(false);
     }
 
     [RelayCommand]

ViewModels/VariableTableViewModel.cs

@@ -232,7 +232,13 @@ partial class VariableTableViewModel : ViewModelBase
     {
         try
         {
-            var importedVariables = await _dialogService.ShowOpcUaImportDialog();
+            string opcUaEndpointUrl = VariableTable?.Device?.OpcUaEndpointUrl;
+            if (string.IsNullOrEmpty(opcUaEndpointUrl))
+            {
+                NotificationHelper.ShowError("OPC UA Endpoint URL 未设置。请在设备详情中配置。");
+                return;
+            }
+            var importedVariables = await _dialogService.ShowOpcUaImportDialog(opcUaEndpointUrl);
             if (importedVariables == null || !importedVariables.Any())
             {
                 return; // 用户取消或没有选择任何变量