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

DMS.WPF/Profiles/MappingProfile.cs

@@ -1,6 +1,7 @@
 using AutoMapper;
 using DMS.Application.DTOs;
 using DMS.Core.Models;
+using DMS.Infrastructure.Models;
 using DMS.WPF.ViewModels.Items;
 
 namespace DMS.WPF.Profiles
@@ -13,6 +14,8 @@ namespace DMS.WPF.Profiles
                 .ReverseMap();
             CreateMap<Variable, VariableItemViewModel>()
                 .ReverseMap();
+            CreateMap<OpcUaNode, OpcUaNodeItemViewModel>()
+                .ReverseMap();
             CreateMap<VariableItemViewModel, VariableItemViewModel>();
                 
 

DMS.WPF/ViewModels/Dialogs/ImportOpcUaDialogViewModel.cs

@@ -1,5 +1,8 @@
+using AutoMapper;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
+using DMS.Core.Enums;
+using DMS.Core.Helper;
 using DMS.Core.Models;
 using DMS.Helper;
 using DMS.Infrastructure.Interfaces.Services;
@@ -17,10 +20,10 @@ public partial class ImportOpcUaDialogViewModel : DialogViewModelBase<List<Varia
     private string _endpointUrl = "opc.tcp://127.0.0.1:4855"; // 默认值
 
     [ObservableProperty]
-    private OpcUaNode _rootOpcUaNode;
+    private OpcUaNodeItemViewModel _rootOpcUaNode;
 
     [ObservableProperty]
-    private ObservableCollection<Variable> _selectedNodeVariables;
+    private ObservableCollection<VariableItemViewModel> _selectedNodeVariables;
 
     public List<Variable> SelectedVariables { get; set; } = new List<Variable>();
 
@@ -39,15 +42,15 @@ public partial class ImportOpcUaDialogViewModel : DialogViewModelBase<List<Varia
     private Session _session;
 
     private readonly IOpcUaService _opcUaService;
-
+    private readonly IMapper _mapper;
     private CancellationTokenSource _cancellationTokenSource;
 
-    public ImportOpcUaDialogViewModel(IOpcUaService opcUaService)
+    public ImportOpcUaDialogViewModel(IOpcUaService opcUaService,IMapper mapper)
     {
-        //OpcUaNodes = new ObservableCollection<OpcUaNode>();
+        SelectedNodeVariables = new ObservableCollection<VariableItemViewModel>();
-        SelectedNodeVariables = new ObservableCollection<Variable>();
         this._opcUaService = opcUaService;
-        RootOpcUaNode = new OpcUaNode() { DisplayName = "根节点", NodeId = Objects.ObjectsFolder };
+        this._mapper = mapper;
+        RootOpcUaNode = new OpcUaNodeItemViewModel() { DisplayName = "根节点", NodeId = Objects.ObjectsFolder, IsExpanded = true };
         _cancellationTokenSource = new CancellationTokenSource();
 
     }
@@ -65,6 +68,7 @@ public partial class ImportOpcUaDialogViewModel : DialogViewModelBase<List<Varia
 
             if (_opcUaService.IsConnected)
             {
+                IsConnected=true;
                 ConnectButtonText = "已连接";
                 IsConnectButtonEnabled = false;
             }
@@ -72,7 +76,8 @@ public partial class ImportOpcUaDialogViewModel : DialogViewModelBase<List<Varia
 
             // 浏览根节点
 
-            await _opcUaService.BrowseNode(RootOpcUaNode);
+           var childrens= await _opcUaService.BrowseNode(_mapper.Map<OpcUaNode>(RootOpcUaNode));
+            RootOpcUaNode.Children = _mapper.Map<ObservableCollection<OpcUaNodeItemViewModel>>(childrens);
 
 
         }
@@ -85,6 +90,18 @@ public partial class ImportOpcUaDialogViewModel : DialogViewModelBase<List<Varia
         }
     }
 
+    [RelayCommand]
+    private async void PrimaryButton()
+    {
+        await _opcUaService.DisconnectAsync();
+    }
+
+    [RelayCommand]
+    private async void CloseButton()
+    {
+        await _opcUaService.DisconnectAsync();
+    }
+
     /// <summary>
     /// 处理来自服务器的数据变化通知
     /// </summary>
@@ -97,176 +114,69 @@ public partial class ImportOpcUaDialogViewModel : DialogViewModelBase<List<Varia
         }
     }
 
-    //private async Task BrowseNodes(ObservableCollection<OpcUaNode> nodes, NodeId parentNodeId)
-    //{
-    //    try
-    //    {
-    //        Opc.Ua.ReferenceDescriptionCollection references;
-    //        byte[] continuationPoint = null;
 
-    //        _session.Browse(
-    //            null, // RequestHeader
-    //            new ViewDescription(),
-    //            parentNodeId,
-    //            0u,
-    //            BrowseDirection.Forward,
-    //            Opc.Ua.ReferenceTypeIds.HierarchicalReferences,
-    //            true,
-    //            (uint)Opc.Ua.NodeClass.Object | (uint)Opc.Ua.NodeClass.Variable,
-    //            out continuationPoint,
-    //            out references
-    //        );
 
-    //        foreach (var rd in references)
+    private bool _isLoadingNodeVariables = false;
-    //        {
-    //            NodeType nodeType = NodeType.Folder; // 默认是文件夹
-    //            if ((rd.NodeClass & NodeClass.Variable) != 0)
-    //            {
-    //                nodeType = NodeType.Variable;
-    //            }
-    //            else if ((rd.NodeClass & NodeClass.Object) != 0)
-    //            {
-    //                nodeType = NodeType.Object;
-    //            }
     
-    //            var opcUaNode = new OpcUaNode(rd.DisplayName.Text, (NodeId)rd.NodeId, nodeType);
+    public async Task LoadNodeVariables(OpcUaNodeItemViewModel node)
-    //            nodes.Add(opcUaNode);
-
-    //            // 如果是文件夹或对象，添加一个虚拟子节点，用于懒加载
-    //            if (nodeType == NodeType.Folder || nodeType == NodeType.Object)
-    //            {
-    //                opcUaNode.Children.Add(new OpcUaNode("Loading...", NodeId.Null, NodeType.Folder)); // 虚拟节点
-    //            }
-    //        }
-    //    }
-    //    catch (Exception ex)
-    //    {
-    //        NlogHelper.Error($"浏览 OPC UA 节点失败: {parentNodeId} - {ex.Message}", ex);
-    //        NotificationHelper.ShowError($"浏览 OPC UA 节点失败: {parentNodeId} - {ex.Message}", ex);
-    //    }
-    //}
-
-    //public async Task LoadNodeVariables(OpcUaNode node)
-    //{
-    //if (node.NodeType == NodeType.Variable)
-    //{
-    //    // 如果是变量节点，直接显示它
-    //    SelectedNodeVariables.Clear();
-    //    SelectedNodeVariables.Add(new Variable
-    //    {
-    //        Name = node.DisplayName,
-    //        NodeId = node.NodeId.ToString(),
-    //        OpcUaNodeId = node.NodeId.ToString(),
-    //        ProtocolType = ProtocolType.OpcUA,
-    //        IsActive = true // 默认选中
-    //    });
-    //    return;
-    //}
-
-    //if (node.IsLoaded || node.IsLoading)
-    //{
-    //    return; // 已经加载或正在加载
-    //}
-
-    //node.IsLoading = true;
-    //node.Children.Clear(); // 清除虚拟节点
-
-    //try
-    //{
-    //    Opc.Ua.ReferenceDescriptionCollection references;
-    //    byte[] continuationPoint = null;
-
-    //    _session.Browse(
-    //        null, // RequestHeader
-    //        new ViewDescription(),
-    //        node.NodeId,
-    //        0u,
-    //        BrowseDirection.Forward,
-    //        Opc.Ua.ReferenceTypeIds.HierarchicalReferences,
-    //        true,
-    //        (uint)Opc.Ua.NodeClass.Object | (uint)Opc.Ua.NodeClass.Variable,
-    //        out continuationPoint,
-    //        out references
-    //    );
-
-    //    foreach (var rd in references)
-    //    {
-    //        NodeType nodeType = NodeType.Folder;
-    //        if ((rd.NodeClass & NodeClass.Variable) != 0)
-    //        {
-    //            nodeType = NodeType.Variable;
-    //        }
-    //        else if ((rd.NodeClass & NodeClass.Object) != 0)
-    //        {
-    //            nodeType = NodeType.Object;
-    //        }
-
-    //        var opcUaNode = new OpcUaNode(rd.DisplayName.Text, (NodeId)rd.NodeId, nodeType);
-    //        node.Children.Add(opcUaNode);
-
-    //        if (nodeType == NodeType.Folder || nodeType == NodeType.Object)
-    //        {
-    //            opcUaNode.Children.Add(new OpcUaNode("Loading...", NodeId.Null, NodeType.Folder)); // 虚拟节点
-    //        }
-
-    //        // 如果是变量，添加到右侧列表
-    //        if (nodeType == NodeType.Variable)
-    //        {
-    //            // Read the DataType attribute
-    //            ReadValueId readValueId = new ReadValueId
-    //            {
-    //                NodeId = opcUaNode.NodeId,
-    //                AttributeId = Attributes.DataType,
-    //                // You might need to specify IndexRange and DataEncoding if dealing with arrays or specific encodings
-    //            };
-
-    //            DataValueCollection results;
-    //            DiagnosticInfoCollection diagnosticInfos;
-
-    //            _session.Read(
-    //                null, // RequestHeader
-    //                0, // MaxAge
-    //                TimestampsToReturn.Source,
-    //                new ReadValueIdCollection { readValueId },
-    //                out results,
-    //                out diagnosticInfos
-    //            );
-
-    //            string dataType = string.Empty;
-
-    //            if (results != null && results.Count > 0 && results[0].Value != null)
-    //            {
-    //                // Convert the NodeId of the DataType to a readable string
-    //                NodeId dataTypeNodeId = (NodeId)results[0].Value;
-    //                dataType = _session.NodeCache.GetDisplayText(dataTypeNodeId);
-    //            }
-
-    //            SelectedNodeVariables.Add(new Variable
-    //            {
-    //                Name = opcUaNode.DisplayName,
-    //                OpcUaNodeId = opcUaNode.NodeId.ToString(),
-    //                ProtocolType = ProtocolType.OpcUA,
-    //                IsActive = true, // Default selected
-    //                DataType = dataType // Assign the read DataType
-    //            });
-    //        }
-    //    }
-
-    //    node.IsLoaded = true;
-    //}
-    //catch (Exception ex)
-    //{
-    //    NlogHelper.Error($"加载 OPC UA 节点变量失败: {node.NodeId} - {ex.Message}", ex);
-    //    NotificationHelper.ShowError($"加载 OPC UA 节点变量失败: {node.NodeId} - {ex.Message}", ex);
-    //}
-    //finally
-    //{
-    //    node.IsLoading = false;
-    //}
-    //}
-
-    public ObservableCollection<Variable> GetSelectedVariables()
     {
-        return new ObservableCollection<Variable>(SelectedVariables);
+        // 防止重复加载
+        if (_isLoadingNodeVariables)
+            return;
+            
+        _isLoadingNodeVariables = true;
+        
+        try
+        {
+            SelectedNodeVariables.Clear();
+
+            if (node.NodeClass == NodeClass.Variable)
+            {
+                // 如果是变量节点，直接显示它
+                SelectedNodeVariables.Add(new VariableItemViewModel
+                {
+                    Name = node.DisplayName,
+                    OpcUaNodeId = node.NodeId.ToString(),
+                    Protocol = ProtocolType.OpcUa,
+                    IsActive = true // 默认选中
+                });
+                return;
+            }
+
+            // 加载节点的子项
+            node.IsExpanded = true;
+            node.IsSelected = true;
+            
+            var childrens = await _opcUaService.BrowseNode(_mapper.Map<OpcUaNode>(node));
+            foreach (var children in childrens)
+            {
+                var opcNodeItem = _mapper.Map<OpcUaNodeItemViewModel>(children);
+                if (children.NodeClass == NodeClass.Variable)
+                {
+                    SelectedNodeVariables.Add(new VariableItemViewModel
+                    {
+                        Name = children.DisplayName, // 修正：使用子节点的显示名称
+                        OpcUaNodeId = children.NodeId.ToString(),
+                        Protocol = ProtocolType.OpcUa,
+                        IsActive = true // 默认选中
+                    });
+                }
+                else
+                {
+                    node.Children.Add(opcNodeItem);
                 }
             }
+        }
+        catch (Exception ex)
+        {
+            NlogHelper.Error($"加载 OPC UA 节点变量失败: {node.NodeId} - {ex.Message}", ex);
+            NotificationHelper.ShowError($"加载 OPC UA 节点变量失败: {node.NodeId} - {ex.Message}", ex);
+        }
+        finally
+        {
+            _isLoadingNodeVariables = false;
+        }
+    }
+
+
+}

DMS.WPF/ViewModels/Items/OpcUaNodeItemViewModel.cs

@@ -0,0 +1,49 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using DMS.Infrastructure.Models;
+using Opc.Ua;
+using System.Collections.ObjectModel;
+
+namespace DMS.WPF.ViewModels.Items
+{
+    /// <summary>
+    /// OPC UA节点的视图模型。
+    /// </summary>
+    public partial class OpcUaNodeItemViewModel : ObservableObject
+    {
+
+        [ObservableProperty]
+        private NodeId? _nodeId;
+
+        [ObservableProperty]
+        private string? _displayName;
+
+        [ObservableProperty]
+        private NodeClass _nodeClass;
+
+        [ObservableProperty]
+        private object? _value;
+
+        [ObservableProperty]
+        private OpcUaNodeItemViewModel? _parentNode;
+
+        [ObservableProperty]
+        private ObservableCollection<OpcUaNodeItemViewModel> _children = new ObservableCollection<OpcUaNodeItemViewModel>();
+
+        [ObservableProperty]
+        private bool _isExpanded;
+
+        [ObservableProperty]
+        private bool _isSelected;
+
+        /// <summary>
+        /// 默认构造函数（用于设计时支持）。
+        /// </summary>
+        public OpcUaNodeItemViewModel()
+        {
+            // 设计时数据支持
+           
+        }
+        
+      
+    }
+}

DMS.WPF/ViewModels/Items/OpcUaNodeViewModel.cs

@@ -1,50 +0,0 @@
-using CommunityToolkit.Mvvm.ComponentModel;
-using Opc.Ua;
-using System.Collections.ObjectModel;
-
-namespace DMS.WPF.ViewModels.Items
-{
-    public partial class OpcUaNodeViewModel : ObservableObject
-    {
-        [ObservableProperty]
-        private string _displayName;
-
-        [ObservableProperty]
-        private NodeId _nodeId;
-
-        [ObservableProperty]
-        private NodeType _nodeType;
-
-        [ObservableProperty]
-        private bool _isExpanded;
-
-        [ObservableProperty]
-        private bool _isLoading;
-
-        [ObservableProperty]
-        private bool _isLoaded;
-
-        public ObservableCollection<OpcUaNodeViewModel> Children { get; set; }
-
-        public OpcUaNodeViewModel(string displayName, NodeId nodeId, NodeType nodeType)
-        {
-            DisplayName = displayName;
-            NodeId = nodeId;
-            NodeType = nodeType;
-            Children = new ObservableCollection<OpcUaNodeViewModel>();
-            
-            // 如果是文件夹或对象，添加一个虚拟子节点，用于懒加载
-            if (nodeType == NodeType.Folder || nodeType == NodeType.Object)
-            {
-                Children.Add(new OpcUaNodeViewModel("Loading...", NodeId.Null, NodeType.Folder)); // 虚拟节点
-            }
-        }
-    }
-
-    public enum NodeType
-    {
-        Folder,
-        Object,
-        Variable
-    }
-}

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 System.Windows.Threading;
-using iNKORE.UI.WPF.Modern.Controls;
 
 namespace DMS.WPF.Views.Dialogs;
 
@@ -10,32 +16,58 @@ 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
+        //修改对话框内容的最大宽度和最大高度
-        // ViewModel.ImportSelectedVariables();
+        var backgroundElementBorder = VisualTreeFinder.FindVisualChildByName<Border>(this, "BackgroundElement");
-    }
+        backgroundElementBorder.MaxWidth = ContentAreaMaxWidth;
-
+        backgroundElementBorder.MaxWidth = ContentAreaMaxHeight;
-    private void ContentDialog_SecondaryButtonClick(ContentDialog sender, ContentDialogButtonClickEventArgs args)
-    {
-        // 处理取消逻辑
     }
 
     private async void TreeView_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
     {
-        // if (e.NewValue is OpcUaNode selectedNode)
+        try
-        // {
+        {
-        //     await ViewModel.LoadNodeVariables(selectedNode);
+            //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)