学步园

摘要：需求是这样的：当前节点是横排的，但是搞了半天，发现它没有这个属性，也就索性用tk的控件了，不是那种特别正式的MVVM的方式，但是还好吧，可以使用的

有一个bug：当所有的子节点不选择的话，父节点还是选择的

<UserControl x:Class="SilverlightApplication1.checkboxtree" xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"
   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"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">
    <UserControl.Resources>
        <Style x:Key="RedItemStyle" TargetType="sdk:TreeViewItem">
            <Setter Property="HeaderTemplate">
                <Setter.Value>
                    <DataTemplate>
                        <StackPanel Orientation="Horizontal">
                            <CheckBox IsChecked="{ Binding}"/>
                            <TextBlock Text="{Binding }" Foreground="Red" FontStyle="Italic" />
                        </StackPanel>
                    </DataTemplate>
                </Setter.Value>
            </Setter>
            <Setter Property="IsExpanded" Value="True" />
        </Style>
    </UserControl.Resources>
    <Grid x:Name="LayoutRoot" Background="White">

        <StackPanel x:Name="layout" Background="Azure" Orientation="Horizontal">
            <sdk:TreeView x:Name="TreeOfLife" Margin="5" Grid.Column="0" Grid.Row="1"  SelectedItemChanged="TreeOfLife_SelectedItemChanged" >
            </sdk:TreeView>
        </StackPanel>
    </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;
using System.ComponentModel;
using System.Collections.ObjectModel;
using System.Windows.Data;

namespace SilverlightApplication1
{
    public partial class checkboxtree : UserControl
    {
        ObservableCollection<ForumInfo> forumList = new ObservableCollection<ForumInfo>();//当前页面的view
        public checkboxtree()
        {
            InitializeComponent();
            forumList = GetForumData();//得到数据源
            AddTreeNode(0, null);//将数据源绑定到树
        }

        private void TreeOfLife_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
        {

        }
        //使用递归的思想，将数据绑定到树上
        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();
                    CheckBox ck = new CheckBox();
                    StackPanel sp = new StackPanel();
                    CheckBox cb = new CheckBox();
                    //当选择父节点的时候选择子节点
                    cb.Checked += new RoutedEventHandler((sender, e) =>
                     {
                         foreach (TreeViewItem item in objTreeNode.Items)
                         {
                             ((item.Header as StackPanel).Children[0] as CheckBox).IsChecked = true;
                         }
                     });
                    //不选择父节点的时候，子几点也不要选择
                    cb.Unchecked += new RoutedEventHandler((sender, e) =>
                    {
                        foreach (TreeViewItem item in objTreeNode.Items)
                        {
                            ((item.Header as StackPanel).Children[0] as CheckBox).IsChecked = false;
                        }
                    });

                    cb.Content = foruminfo.ForumName;
                    cb.IsChecked = foruminfo.IsChecked;
                    sp.Children.Add(cb);
                    objTreeNode.Header = sp;//关键就是在 这个 Header                  
                    
                    // 创建带ck的节点等效与下面的代码

                    //<sdk:TreeViewItem>
                    //    <sdk:TreeViewItem.Header>
                    //        <CheckBox Content="我是叶子呀" Width="100"  Click="CheckBox_Click">
                    //        </CheckBox>
                    //    </sdk:TreeViewItem.Header>
                    //</sdk:TreeViewItem>

                    objTreeNode.DataContext = foruminfo;
                    objTreeNode.IsExpanded = true;
                    //objTreeNode.TabNavigation=
                    //此样式将会添加的所有叶子结点上
                    //添加根节点
                    if (treeViewItem == null)
                    {
                        TreeOfLife.Items.Add(objTreeNode);
                    }
                    else
                    {
                        treeViewItem.Items.Add(objTreeNode);
                    }
                    AddTreeNode(foruminfo.ForumID, objTreeNode);
                }
            }
        }

        #region  数据
        public ObservableCollection<ForumInfo> GetForumData()
        {
            ObservableCollection<ForumInfo> forumList = new ObservableCollection<ForumInfo>();
            forumList.Add(new ForumInfo() { ForumID = 1, ParendID = 0, ForumName = "根1", IsChecked = false });
            forumList.Add(new ForumInfo() { ForumID = 2, ParendID = 1, ForumName = "子节点2", IsChecked = true });

            forumList.Add(new ForumInfo() { ForumID = 3, ParendID = 1, ForumName = "子节点3", IsChecked = false });
            forumList.Add(new ForumInfo() { ForumID = 4, ParendID = 1, ForumName = "子节点4", IsChecked = false });
            forumList.Add(new ForumInfo() { ForumID = 5, ParendID = 4, ForumName = "子节点5", IsChecked = true });
            forumList.Add(new ForumInfo() { ForumID = 6, ParendID = 4, ForumName = "子节点6", IsChecked = true });

         

            return forumList;
        }
        public class ForumInfo
        {
            public int ForumID { get; set; }
            public int ParendID { get; set; }
            public string ForumName { get; set; }
            public bool IsChecked { get; set; }
        }
        #endregion

    }
}