silverlight treeview 节点顺序实例

  现在有个需求，就是把silverlight treeview 同级的节点能够通过Button 进行向上向下调整

  如果有此类需求，就参考吧。

<UserControl
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk" x:Class="tree节点顺序.MainPage"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">

    <Grid x:Name="LayoutRoot" Background="White">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="277*"/>
            <ColumnDefinition Width="123*"/>
        </Grid.ColumnDefinitions>

        <sdk:TreeView x:Name="TreeOfLife"/>
        <Button x:Name="up" Content="向上" HorizontalAlignment="Left" Margin="7.948,46,0,0" VerticalAlignment="Top" Width="82" Height="45" RenderTransformOrigin="0.5,0.5" Click="up_Click" Grid.Column="1">

        </Button>
        <Button x:Name="down" Content="向下" HorizontalAlignment="Left" Margin="7.948,130,0,0" VerticalAlignment="Top" Width="84" RenderTransformOrigin="0.57,0.348" Height="56" Click="down_Click" Grid.Column="1"/>

    </Grid>
</UserControl>

  

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace tree节点顺序
{
    public partial class MainPage : UserControl
    {
        #region 填充树
        public class ForumInfo
        {
            public int ForumID { get; set; }
            public int ParendID { get; set; }
            public string ForumName { get; set; }
        }
        List<ForumInfo> forumList = new List<ForumInfo>();
        public MainPage()
        {
            InitializeComponent();
            GetForumData();
            AddTreeNode(0, null);
        }
        public void GetForumData()
        {

            forumList.Add(new ForumInfo() { ForumID = 1, ParendID = 0, ForumName = "笔记本版块" });
            forumList.Add(new ForumInfo() { ForumID = 2, ParendID = 0, ForumName = "台式机版块" });

            forumList.Add(new ForumInfo() { ForumID = 3, ParendID = 1, ForumName = "Dell笔记本" });
            forumList.Add(new ForumInfo() { ForumID = 4, ParendID = 1, ForumName = "IBM笔记本" });
            forumList.Add(new ForumInfo() { ForumID = 5, ParendID = 1, ForumName = "IBM-T系列" });
            forumList.Add(new ForumInfo() { ForumID = 6, ParendID = 1, ForumName = "IBM-R系列" });

            forumList.Add(new ForumInfo() { ForumID = 7, ParendID = 2, ForumName = "联想台式机" });
            forumList.Add(new ForumInfo() { ForumID = 8, ParendID = 2, ForumName = "方正台式机" });
            forumList.Add(new ForumInfo() { ForumID = 9, ParendID = 2, ForumName = "HP台式机" });
            forumList.Add(new ForumInfo() { ForumID = 10, ParendID = 2, ForumName = "联想家悦H系列" });
            forumList.Add(new ForumInfo() { ForumID = 11, ParendID = 2, ForumName = "联想IdeaCentre系列" });


        }

        private void AddTreeNode(int parentID, TreeViewItem treeViewItem)
        {
            List<ForumInfo> result = (from forumInfo in forumList
                                      where forumInfo.ParendID == parentID
                                      select forumInfo).ToList<ForumInfo>();

            if (result.Count > 0)
            {
                foreach (ForumInfo foruminfo in result)
                {
                    TreeViewItem objTreeNode = new TreeViewItem();
                    objTreeNode.Header = foruminfo.ForumName;
                    objTreeNode.DataContext = foruminfo;


                    if (treeViewItem == null)
                    {
                        TreeOfLife.Items.Add(objTreeNode);
                    }
                    else
                    {
                        treeViewItem.Items.Add(objTreeNode);
                    }
                    AddTreeNode(foruminfo.ForumID, objTreeNode);
                }
            }
        }

        #endregion

        /// <summary>
        /// 调整节点顺序
        /// </summary>
        /// <param name="updown">向上-1 向下+1</param>
        /// <param name="TreeOfLife">树实例</param>
        private void treeitemupdown(int updown, TreeView TreeOfLife)
        {
            System.Windows.Controls.TreeViewItem SelectedItem = TreeOfLife.SelectedItem as TreeViewItem;

            System.Windows.Controls.TreeViewItem item = SelectedItem;
            if (SelectedItem != null)
            {
                System.Windows.Controls.TreeViewItem itemParent = item.Parent as TreeViewItem;
                System.Windows.Controls.TreeViewItem itemNewParent;
                int index;
                if (itemParent == null)//如果树本身无根节点选中分类
                {

                    index = TreeOfLife.Items.IndexOf(item);


                    if (index<0 || index + updown < 0 || index + updown >= TreeOfLife.Items.Count)
                    {
                        return;
                    }
                    TreeOfLife.Items.Remove(item);
                    TreeOfLife.Items.Insert(index + updown, item);
                }
                else
                {
                    index = itemParent.Items.IndexOf(item);
                 
                    if (index < 0 ||  index + updown < 0 || index + updown >= itemParent.Items.Count)
                    {
                        return;
                    }
                    itemParent.Items.Remove(item);
                    itemParent.Items.Insert(index + updown, item);


                }

                item.IsSelected = true;
            }
        }





        private void up_Click(object sender, RoutedEventArgs e)
        {
            treeitemupdown(-1,TreeOfLife);
        }

        private void down_Click(object sender, RoutedEventArgs e)
        {
            treeitemupdown(1, TreeOfLife);
        }
    }
}