wpf treeview 數據綁定 遞歸綁定節點

1.先上效果

將所有節點加入ComboBox數據源，在ComboBox中選擇時下方Treeview顯示該節點下的子節點。

1.xaml文件，將以下代碼加入界面合適位置

 1 　　　　<StackPanel>
 2             <StackPanel Margin="10">
 3                 <Label Content="選擇組節點："></Label>
 4                 <ComboBox MaxDropDownHeight="100" Name="cmbGoup" DropDownClosed="cmbGoup_DropDownClosed"></ComboBox>
 5             </StackPanel>
 6             <StackPanel Margin ="10">
 7                 <TreeView x:Name="tvGroup">
 8                     <TreeView.ItemTemplate>
 9                         <HierarchicalDataTemplate ItemsSource="{Binding Nodes}">
10                             <StackPanel>
11                                 <TextBlock VerticalAlignment="Center" FontSize="14" Text="{Binding GroupName}" Margin="2,0,0,0"></TextBlock>
12                             </StackPanel>
13                         </HierarchicalDataTemplate>
14                     </TreeView.ItemTemplate>
15                 </TreeView>
16             </StackPanel>
17         </StackPanel>

2.後臺代碼

a.用於綁定的節點類

 1     public class Group
 2     {
 3         public Group()
 4         {
 5             this.Nodes = new List<Group>();
 6             this.ParentId = 0;//主節點的父id預設為0
 7         }
 8 
 9         public List<Group> Nodes { get; set; }
10         public int ID { get; set; }//id
11         public int ParentId { get; set; }//parentID
12         public string GroupName { get; set; }
13     }

b.主界面類代碼

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

            #region 用於綁定的數據
            List<Group> grpLst = new List<Group>(){
                new Group(){ID=0,GroupName="Group", ParentId = -1},
                new Group(){ID=1,GroupName="Group1",ParentId=0},
                new Group(){ID=2,GroupName="Group2",ParentId=0},
                new Group(){ID=3,GroupName="Group1_1",ParentId=1},
                new Group(){ID=4,GroupName="Group1_2",ParentId=1},
                new Group(){ID=5,GroupName="Group1_3",ParentId=1},
                new Group(){ID=6,GroupName="Group1_4",ParentId=1},
                new Group(){ID=7,GroupName="Group1_5",ParentId=1},
                new Group(){ID=8,GroupName="Group2_1",ParentId=2},
                new Group(){ID=9,GroupName="Group2_2",ParentId=2},
                new Group(){ID=10,GroupName="Group2_3",ParentId=2},
                new Group(){ID=11,GroupName="Group2_4",ParentId=2},
                new Group(){ID=12,GroupName="Group1_1_1",ParentId=3},
                new Group(){ID=13,GroupName="Group1_1_2",ParentId=3},
                new Group(){ID=14,GroupName="Group1_2_1",ParentId=4},
                new Group(){ID=15,GroupName="Group1_1_1_1",ParentId=12}
            };
            #endregion

            this.cmbGoup.ItemsSource = grpLst;//comboBox數據源
            this.cmbGoup.SelectedValuePath = "ID";
            this.cmbGoup.DisplayMemberPath = "GroupName";

            List<Group> lstGroup = getTreeData(-1, grpLst);//初始化時獲取父節點為-1的數據
            this.tvGroup.ItemsSource = lstGroup;//數據綁定
        }

        /// <summary>
        /// 遞歸生成樹形數據
        /// </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>
        /// 下拉框關閉事件
        /// </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;//選中的組號
            List<Group> lstGroup = getTreeData(groupId, (List<Group>)cmbGoup.ItemsSource);
            this.tvGroup.ItemsSource = lstGroup;
        }
    }