解决TreeView的TreeView_SelectedItemChanged事件被多次调用的问题

DMS.WPF/Views/Dialogs/ImportOpcUaDialog.xaml

@@ -8,10 +8,10 @@
     xmlns:vm="clr-namespace:DMS.WPF.ViewModels.Dialogs"
     Title="从OPC UA服务器导入变量"
     d:DataContext="{d:DesignInstance vm:ImportOpcUaDialogViewModel}"
-    PrimaryButtonClick="ContentDialog_PrimaryButtonClick"
+    CloseButtonCommand="{Binding CloseButtonCommand}"
+    CloseButtonText="取消"
+    PrimaryButtonCommand="{Binding PrimaryButtonCommand}"
     PrimaryButtonText="导入"
-    SecondaryButtonClick="ContentDialog_SecondaryButtonClick"
-    SecondaryButtonText="取消"
     mc:Ignorable="d">
     <Grid>
         <Grid.RowDefinitions>
@@ -47,6 +47,7 @@
 
         <!--  节点树  -->
         <TreeView
+            Name="treeView"
             Grid.Row="1"
             Grid.Column="0"
             Margin="0,0,10,0"
@@ -67,6 +68,18 @@
                     <TextBlock Text="{Binding DisplayName}" />
                 </HierarchicalDataTemplate>
             </TreeView.ItemTemplate>
+            <TreeView.ItemContainerStyle>
+                <Style BasedOn="{StaticResource {x:Type TreeViewItem}}" TargetType="{x:Type TreeViewItem}">
+                    <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
+                    <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
+                    <Setter Property="FontWeight" Value="Normal" />
+                    <Style.Triggers>
+                        <Trigger Property="IsSelected" Value="True">
+                            <Setter Property="FontWeight" Value="Bold" />
+                        </Trigger>
+                    </Style.Triggers>
+                </Style>
+            </TreeView.ItemContainerStyle>
         </TreeView>
 
         <!--  变量列表  -->

DMS.WPF/Views/Dialogs/ImportOpcUaDialog.xaml.cs

@@ -1,7 +1,13 @@
+using DMS.Helper;
+using DMS.Services;
+using DMS.WPF.Helper;
+using DMS.WPF.ViewModels.Dialogs;
+using DMS.WPF.ViewModels.Items;
+using iNKORE.UI.WPF.Modern.Controls;
+using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Controls;
-using DMS.WPF.ViewModels.Dialogs;
-using iNKORE.UI.WPF.Modern.Controls;
+using System.Windows.Threading;
 
 namespace DMS.WPF.Views.Dialogs;
 
@@ -10,41 +16,67 @@ namespace DMS.WPF.Views.Dialogs;
 /// </summary>
 public partial class ImportOpcUaDialog : ContentDialog
 {
+    private const int ContentAreaMaxWidth = 1200;
+    private const int ContentAreaMaxHeight = 800;
+
+
+
 
     public ImportOpcUaDialog()
     {
         InitializeComponent();
+        this.Opened += OnOpened;
     }
 
-    private void ContentDialog_PrimaryButtonClick(ContentDialog sender, ContentDialogButtonClickEventArgs args)
+    private void OnOpened(ContentDialog sender, ContentDialogOpenedEventArgs args)
     {
-        // 在这里处理导入逻辑，例如获取选中的变量
-        // ViewModel.ImportSelectedVariables();
-    }
-
-    private void ContentDialog_SecondaryButtonClick(ContentDialog sender, ContentDialogButtonClickEventArgs args)
-    {
-        // 处理取消逻辑
+        //修改对话框内容的最大宽度和最大高度
+        var backgroundElementBorder = VisualTreeFinder.FindVisualChildByName<Border>(this, "BackgroundElement");
+        backgroundElementBorder.MaxWidth = ContentAreaMaxWidth;
+        backgroundElementBorder.MaxWidth = ContentAreaMaxHeight;
     }
 
     private async void TreeView_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
     {
-        // if (e.NewValue is OpcUaNode selectedNode)
-        // {
-        //     await ViewModel.LoadNodeVariables(selectedNode);
-        // }
+        try
+        {
+            //防止多次调用
+            object selectedObj = this.treeView.SelectedItem;
+            if (SelectedItemChanged != null)
+            {
+                Dispatcher.BeginInvoke(DispatcherPriority.Background, SelectedItemChanged, selectedObj);
+            }
+        }
+        catch (Exception ex)
+        {
+            NotificationHelper.ShowError($"选择节点时发生了错误：{ex.Message}");
+        }
+
+
     }
 
+    //事件
+    public async void SelectedItemChanged(object selectedObj)
+    {
+        if (selectedObj is OpcUaNodeItemViewModel selectedNode)
+        {
+
+            if (this.DataContext is ImportOpcUaDialogViewModel viewModel)
+            {
+                await viewModel.LoadNodeVariables(selectedNode);
+            }
+        }
+    }
 
     private void Selector_OnSelectionChanged(object sender, SelectionChangedEventArgs args)
     {
-       // if (args.AddedItems!=null && args.AddedItems.Count>0)
-       //  {
-       //      foreach (var item in args.AddedItems)
-       //      {
-       //          ViewModel.SelectedVariables.Add((Variable)item);
-       //      }
-       //      
-       //  } 
+        // if (args.AddedItems!=null && args.AddedItems.Count>0)
+        //  {
+        //      foreach (var item in args.AddedItems)
+        //      {
+        //          ViewModel.SelectedVariables.Add((Variable)item);
+        //      }
+        //      
+        //  } 
     }
 }