WPF 使用CheckBox实现联动——全选和反选

XAML前端代码：

<Window x:Class="Treeview.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:c="clr-namespace:Treeview"
Title="MainWindow" Height="350" Width="525">
<TreeView Name="tv" Width="170" Height="800" MaxHeight="520" BorderThickness="0">
<TreeView.ItemTemplate>
<HierarchicalDataTemplate DataType="{x:Type c:TreeCategory}"  ItemsSource="{Binding Children}">
<StackPanel  Margin="-2,0,0,0" Orientation="Horizontal" x:Name="staTree">
<CheckBox x:Name="checkBox" Tag="{Binding Id}" IsChecked="{Binding IsSelected}" HorizontalAlignment="Center" VerticalAlignment="Center" Checked="CheckBox_Checked" Unchecked="checkBox_Unchecked" />
<Image Source="{Binding Icon}" Height="20" Width="20" Margin="5"/>
<TextBlock Text="{Binding Title}" FontSize="14" FontFamily="微软雅黑" HorizontalAlignment="Center" VerticalAlignment="Center"/>
</StackPanel>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
</Window>

ReportCategoryEntity类

public class ReportCategoryEntity

{
public int Id { get; set; }
/// <summary>
/// 名称
/// </summary>
public string Title { get; set; }
/// <summary>
///父节点
/// </summary>
public int ParentID { get; set; }
public ObservableCollection<TreeCategory> Children { get; set; }
public TreeCategory Parent { get; set; }
public string Icon { get; set; }
public ReportCategoryEntity()
{
this.Icon = @"\Images\Directory.png";
this.Children = new ObservableCollection<TreeCategory>();
}
}

TreeCategory 类，实现INotifyPropertyChanged接口

public class TreeCategory : INotifyPropertyChanged
{
private ObservableCollection<TreeCategory> children = new ObservableCollection<TreeCategory>();

public TreeCategory() { }

public TreeCategory(ObservableCollection<ReportCategoryEntity> totalCategory, int parentID)  //0  根目录
{

//第一步：选择根节点
foreach (ReportCategoryEntity item in totalCategory.Where(p => p.ParentID == 0))
{
TreeCategory tc = new TreeCategory();
tc.id = item.Id;
tc.parentID = item.ParentID;
tc.title = item.Title;
tc.icon = @"\Images\Folders_Down.png";
children.Add(tc);
}
//第二步：为每个子节点找到对应的父亲
foreach (ReportCategoryEntity item in totalCategory.Where(p => p.ParentID != 0))
{
Find_item(children, item);
if (item.Children.Count == 0)
{
item.Icon = @"\Images\Directory.png";
}
}
}
//子级递归
private void Find_item(ObservableCollection<TreeCategory> _list, ReportCategoryEntity _item)
{
foreach (TreeCategory item in _list)
{
if (item.Id == _item.ParentID)
{
TreeCategory tc = new TreeCategory();
tc.id = _item.Id;
tc.parentID = _item.ParentID;
tc.title = _item.Title;
tc.icon = _item.Icon;
tc.parent = item;
item.icon = @"\Images\Folders_Down.png";
item.Children.Add(tc);
return;
}
if(item.Children != null)
{
Find_item(item.Children, _item);
}

}
}

public ObservableCollection<TreeCategory> Children
{
get { return this.children; }
}
private int id;
public int Id
{
get { return id; }
set { id = value; }
}
private int parentID;
public int ParentID
{
get { return parentID; }
set { parentID = value; }
}
private string icon;
public string Icon
{
get { return icon; }
set { icon = value; }
}
private TreeCategory parent;

public TreeCategory Parent
{
get { return parent; }
set { parent = value; }
}
/// <summary>
/// 显示的名称
/// </summary>
private string title;
public string Title
{
get
{
return title;
}
set
{
title = value;
this.NotifyPropertyChanged("Title");
}
}
/// <summary>
/// 是否选中
/// </summary>
private bool isSelected = false;
public bool IsSelected
{
set
{
this.isSelected = value;
this.NotifyPropertyChanged("IsSelected");
}
get { return this.isSelected; }
}
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(String info)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(info));
}
}

}

后台代码：

/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
private ObservableCollection<TreeCategory> collection = new ObservableCollection<TreeCategory>();

public MainWindow()
{
InitializeComponent();
//数据初始化
ObservableCollection<ReportCategoryEntity> ctagr = new ObservableCollection<ReportCategoryEntity>() {
new ReportCategoryEntity(){Id = 1,Title = "Node1.",ParentID = 0},
new ReportCategoryEntity(){Id = 2,Title = "Node2.",ParentID = 0},
new ReportCategoryEntity(){Id = 3,Title = "Node3.",ParentID = 1},
new ReportCategoryEntity(){Id = 4,Title = "Node4.",ParentID = 3},
new ReportCategoryEntity(){Id = 5,Title = "Node5.",ParentID = 3},
new ReportCategoryEntity(){Id = 6,Title = "Node6.",ParentID = 4},
new ReportCategoryEntity(){Id = 7,Title = "Node7.",ParentID = 2},
new ReportCategoryEntity(){Id = 8,Title = "Node8.",ParentID = 7},
new ReportCategoryEntity(){Id = 9,Title = "Node9.",ParentID = 8}
};
TreeCategory tc = new TreeCategory(ctagr,0);
//数据绑定
collection=tc.Children;
tv.ItemsSource = collection;
}
/// <summary>
/// 选中事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void CheckBox_Checked(object sender, RoutedEventArgs e)
{
ObservableCollection<TreeCategory> ob_list = new ObservableCollection<TreeCategory>();
//将list转换成ObservableCollection
foreach (TreeCategory item in tv.Items)
{
ob_list.Add(item);
}
//遍历ob_list
foreach (var item in ob_list)
{
//递归CheckBox
foreach (var items in item.Children)
{
FindChild(ob_list, true,"checked",0);
}
}
}
/// <summary>
/// CheckBox绑定的ID泛型
/// </summary>
private List<int> list_id = new List<int>();
/// <summary>
/// 取消事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void checkBox_Unchecked(object sender, RoutedEventArgs e)
{
CheckBox dg = sender as CheckBox;
int checkBox_id =Convert.ToInt32(dg.Tag.ToString());
if (list_id.Count>0)
{
//清空集合
list_id.RemoveAt(0);
}
list_id.Add(checkBox_id);
ObservableCollection<TreeCategory> ob_list = new ObservableCollection<TreeCategory>(
943b
);
//将list转换成ObservableCollection
foreach (TreeCategory item in tv.Items)
{
ob_list.Add(item);
}
//遍历ob_list
foreach (var item in ob_list)
{
//递归CheckBox
foreach (var items in item.Children)
{
FindChild(ob_list, false, "Unchecked", list_id[0]);
}
}
}
public void FindChild(ObservableCollection<TreeCategory> list, bool flog, string type, int id)
{
foreach (TreeCategory item in list)
{
//选中遍历
if (type=="checked")
{
//判断是否选中
if (item.IsSelected)
{
item.IsSelected = flog;
}
//判断是否有父级
if (item.Parent!=null)
{
//如果有父级并且被选中，那么子级也被选中
if (item.Parent.IsSelected)
{
item.IsSelected = flog;
}
}
}
else//取消遍历
{
//判断是否有父级
if (item.Parent != null)
{
//判断是父级编号是否与点击的编号相等
if (item.Parent.Id == id)
{
item.IsSelected = flog;
}
}
}
//查询子级
if (item.Children != null)
{
FindChild(item.Children, flog, type, id);
}
}
}
}