一、概述
本文演示了如何递归生成数据，用于绑定TreeView以及TreeItem的双击事件。
二、参考代码
1 using System; 2 using System.Collections.Generic; 3 using System.ComponentModel; 4 using System.Linq; 5 using System.Windows; 6 using System.Windows.Controls; 7 using System.Windows.Input; 8 9 namespace BindingDemo6TreeBinding 10 { 11 12 /// <summary> 13 /// Interaction logic for MainWindow.xaml 14 /// </summary> 15 public partial class MainWindow : Window 16 { 17 public MainWindow() 18 { 19 InitializeComponent(); 20 21 #region 用于绑定的数据 22 List<TreeItem> grpLst = new List<TreeItem>(){ 23 new TreeItem(){ID=0,ItemName="Root", ParentId = -1,IsExpanded=true},//设置初始状态为展开状态 24 25 new TreeItem(){ID=1,ItemName="Item1",ParentId=0}, 26 new TreeItem(){ID=2,ItemName="Item1-1",ParentId=1}, 27 new TreeItem(){ID=3,ItemName="Item1-2",ParentId=1}, 28 new TreeItem(){ID=4,ItemName="Item1-3",ParentId=1}, 29 30 new TreeItem(){ID=5,ItemName="Item1-3-1",ParentId=4}, 31 new TreeItem(){ID=6,ItemName="Item1-3-2",ParentId=4}, 32 33 34 35 new TreeItem(){ID=7,ItemName="Item2",ParentId=0}, 36 new TreeItem(){ID=8,ItemName="Item2-1",ParentId=7}, 37 new TreeItem(){ID=9,ItemName="Item2-2",ParentId=7}, 38 39 new TreeItem(){ID=10,ItemName="Item3",ParentId=0} 40 }; 41 #endregion 42 43 this.cmbGoup.ItemsSource = grpLst;//comboBox数据源 44 this.cmbGoup.SelectedValuePath = "ID"; 45 this.cmbGoup.DisplayMemberPath = "ItemName"; 46 47 List<TreeItem> lstGroup = getTreeData(-1, grpLst);//初始化时获取父节点为-1的数据 48 this.tvGroup.ItemsSource = lstGroup;//数据绑定 49 } 50 /// <summary> 51 /// 递归生成树形数据 52 /// </summary> 53 /// <param name="delst"></param> 54 /// <returns></returns> 55 public List<TreeItem> getTreeData(int parentid, List<TreeItem> nodes) 56 { 57 List<TreeItem> mainNodes = nodes.Where(x => x.ParentId == parentid).ToList<TreeItem>(); 58 List<TreeItem> otherNodes = nodes.Where(x => x.ParentId != parentid).ToList<TreeItem>(); 59 foreach (TreeItem grp in mainNodes) 60 { 61 grp.ChildrenItems = getTreeData(grp.ID, otherNodes); 62 } 63 return mainNodes; 64 } 65 66 /// <summary> 67 /// 下拉框关闭事件 68 /// </summary> 69 /// <param name="sender"></param> 70 /// <param name="e"></param> 71 private void cmbGoup_DropDownClosed(object sender, EventArgs e) 72 { 73 if (this.cmbGoup.SelectedValue == null) 74 { 75 return; 76 } 77 int groupId = (int)this.cmbGoup.SelectedValue;//选中的组号 78 List<TreeItem> lstGroup = getTreeData(groupId, (List<TreeItem>)cmbGoup.ItemsSource); 79 this.tvGroup.ItemsSource = lstGroup; 80 } 81 82 83 private void tvDomain_MouseDoubleClick(object sender, MouseButtonEventArgs e) 84 { 85 TreeViewItem trvItem = sender as TreeViewItem; 86 if(trvItem.IsSelected) 87 { 88 TreeItem selectedItem = (TreeItem)(this.tvGroup.SelectedItem); 89 MessageBox.Show(selectedItem.ItemName); 90 } 91 } 92 } 93 public class TreeItem:ViewModelBase 94 { 95 public TreeItem() 96 { 97 this.ChildrenItems = new List<TreeItem>(); 98 this.ParentId = 0;//主节点的父id默认为0 99 } 100 101 public List<TreeItem> ChildrenItems { get; set; } 102 public int ID { get; set; }//id 103 public int ParentId { get; set; }//parentID 104 public string ItemName { get; set; } 105 106 private bool isExpanded; 107 public bool IsExpanded { get { return isExpanded; } set { isExpanded = value; 108 OnPropertyChanged(nameof(IsExpanded)); 109 } } 110 111 112 private bool isSelected; 113 public bool IsSelected 114 { 115 get { return isSelected; } 116 set 117 { 118 isSelected = value; 119 OnPropertyChanged(nameof(IsSelected)); 120 } 121 } 122 123 124 125 126 } 127 public abstract class ViewModelBase : INotifyPropertyChanged, IDisposable 128 { 129 public virtual string DisplayName { get; set; } 130 131 public event PropertyChangedEventHandler PropertyChanged; 132 133 protected void OnPropertyChanged(string propertyName) 134 { 135 PropertyChangedEventHandler handler = PropertyChanged; 136 137 if (handler != null) 138 { 139 handler(this, new PropertyChangedEventArgs(propertyName)); 140 } 141 } 142 143 144 #region IDisposable Members 145 146 public void Dispose() 147 { 148 this.OnDispose(); 149 150 } 151 152 protected virtual void OnDispose() 153 { 154 } 155 156 #endregion 157 } 158 }
1 <Window x:Class="BindingDemo6TreeBinding.MainWindow" 2 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 3 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 4 xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 5 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 6 xmlns:local="clr-namespace:BindingDemo6TreeBinding" 7 mc:Ignorable="d" 8 Title="MainWindow" Height="350" Width="525"> 9 <Grid > 10 <Grid.RowDefinitions> 11 <RowDefinition Height="81*"/> 12 <RowDefinition Height="239*"/> 13 </Grid.RowDefinitions> 14 <Grid.ColumnDefinitions> 15 <ColumnDefinition Width="178*"/> 16 <ColumnDefinition Width="339*"/> 17 </Grid.ColumnDefinitions> 18 <StackPanel Margin="10" Grid.ColumnSpan="2"> 19 <Label Content="选择组节点："></Label> 20 <ComboBox MaxDropDownHeight="100" Name="cmbGoup" DropDownClosed="cmbGoup_DropDownClosed" ></ComboBox> 21 </StackPanel> 22 <StackPanel Margin ="10" Grid.Row="1"> 23 <TreeView x:Name="tvGroup" ScrollViewer.CanContentScroll="True" ScrollViewer.VerticalScrollBarVisibility="Visible" ScrollViewer.HorizontalScrollBarVisibility="Auto"> 24 <TreeView.ItemContainerStyle> 25 <Style TargetType="{x:Type TreeViewItem}"> 26 <Setter Property="IsExpanded" Value="{Binding IsExpanded,Mode=TwoWay}" /> 27 <Setter Property="IsSelected" Value="{Binding IsSelected,Mode=TwoWay}"/> 28 <EventSetter Event="MouseDoubleClick" Handler="tvDomain_MouseDoubleClick"></EventSetter> 29 </Style> 30 </TreeView.ItemContainerStyle> 31 <TreeView.ItemTemplate> 32 <HierarchicalDataTemplate ItemsSource="{Binding ChildrenItems}"> 33 <StackPanel> 34 <TextBlock VerticalAlignment="Center" FontSize="14" Text="{Binding ItemName}" Margin="2,0,0,0"></TextBlock> 35 </StackPanel> 36 </HierarchicalDataTemplate> 37 </TreeView.ItemTemplate> 38 </TreeView> 39 </StackPanel> 40 <GroupBox Grid.Column="1" Grid.Row="1" Margin="2" BorderThickness="0.6" BorderBrush="Silver"> 41 42 43 <Frame x:Name="mainFrame" Margin="2" ScrollViewer.CanContentScroll="True" NavigationUIVisibility="Hidden" /> 44 45 </GroupBox> 46 </Grid> 47 </Window>