wpf treeview 数据绑定 递归绑定节点

1.先上效果

将所有节点加入ComboBox数据源，在ComboBox中选择时下方Treeview显示该节点下的子节点。

1.xaml文件，将以下代码加入界面合适位置

 　　　　<StackPanel>
             <StackPanel Margin="10">
                 <Label Content="选择组节点："></Label>
                 <ComboBox MaxDropDownHeight="100" Name="cmbGoup" DropDownClosed="cmbGoup_DropDownClosed"></ComboBox>
             </StackPanel>
             <StackPanel Margin ="10">
                 <TreeView x:Name="tvGroup">
                     <TreeView.ItemTemplate>
                         <HierarchicalDataTemplate ItemsSource="{Binding Nodes}">
                             <StackPanel>
                                 <TextBlock VerticalAlignment="Center" FontSize="14" Text="{Binding GroupName}" Margin="2,0,0,0"></TextBlock>
                             </StackPanel>
                         </HierarchicalDataTemplate>
                     </TreeView.ItemTemplate>
                 </TreeView>
             </StackPanel>
         </StackPanel>

2.后台代码

a.用于绑定的节点类

     public class Group
     {
         public Group()
         {
             this.Nodes = new List<Group>();
             this.ParentId = ;//主节点的父id默认为0
         }

         public List<Group> Nodes { get; set; }
         public int ID { get; set; }//id
         public int ParentId { get; set; }//parentID
         public string GroupName { get; set; }
     }

b.主界面类代码

public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            #region 用于绑定的数据
            List<Group> grpLst = new List<Group>(){
                new Group(){ID=,GroupName="Group", ParentId = -},
                new Group(){ID=,GroupName="Group1",ParentId=},
                new Group(){ID=,GroupName="Group2",ParentId=},
                new Group(){ID=,GroupName="Group1_1",ParentId=},
                new Group(){ID=,GroupName="Group1_2",ParentId=},
                new Group(){ID=,GroupName="Group1_3",ParentId=},
                new Group(){ID=,GroupName="Group1_4",ParentId=},
                new Group(){ID=,GroupName="Group1_5",ParentId=},
                new Group(){ID=,GroupName="Group2_1",ParentId=},
                new Group(){ID=,GroupName="Group2_2",ParentId=},
                new Group(){ID=,GroupName="Group2_3",ParentId=},
                new Group(){ID=,GroupName="Group2_4",ParentId=},
                new Group(){ID=,GroupName="Group1_1_1",ParentId=},
                new Group(){ID=,GroupName="Group1_1_2",ParentId=},
                new Group(){ID=,GroupName="Group1_2_1",ParentId=},
                new Group(){ID=,GroupName="Group1_1_1_1",ParentId=}
            };
            #endregion

            this.cmbGoup.ItemsSource = grpLst;//comboBox数据源
            this.cmbGoup.SelectedValuePath = "ID";
            this.cmbGoup.DisplayMemberPath = "GroupName";

            List<Group> lstGroup = getTreeData(-, grpLst);//初始化时获取父节点为-1的数据
            this.tvGroup.ItemsSource = lstGroup;//数据绑定
        }

        /// <summary>
        /// 递归生成树形数据
        /// </summary>
        /// <param name="delst"></param>
        /// <returns></returns>
        public List<Group> getTreeData(int parentid, List<Group> nodes)
        {
            List<Group> mainNodes = nodes.Where(x => x.ParentId == parentid).ToList<Group>();
            List<Group> otherNodes = nodes.Where(x => x.ParentId != parentid).ToList<Group>();
            foreach (Group grp in mainNodes)
            {
                grp.Nodes = getTreeData(grp.ID, otherNodes);
            }
            return mainNodes;
        }

        /// <summary>
        /// 下拉框关闭事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void cmbGoup_DropDownClosed(object sender, EventArgs e)
        {
            if (this.cmbGoup.SelectedValue == null)
            {
                return;
            }
            int groupId = (int)this.cmbGoup.SelectedValue;//选中的组号
            List<Group> lstGroup = getTreeData(groupId, (List<Group>)cmbGoup.ItemsSource);
            this.tvGroup.ItemsSource = lstGroup;
        }
    }