摘要：采用HierarchicalDataTemplate数据模板和treeview在MVVM模式下实现行政区划树，
支持勾选。勾选父节点，子节点回全部自动勾选；子节点部分勾选时，父节点半勾选；子节点全部勾选时，父节点勾选。反之亦然。
HierarchicalDataTemplate是分层数据模板，通常用于tree，menu等层级控件。
HierarchicalDataTemplate的ItemsSource属性绑定下一级数据源。
Model为行政区数据实体类，通常访问数据库获取数据并构建对象。
ViewModel为界面的抽象模型，表示界面的数据和行为，是Model和View的桥梁。
view就是界面。
一、代码
1、Model
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2、ViewModel
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Collections.ObjectModel;
using System.Windows.Media;
using System.Windows.Media.Imaging;
namespace WpfHierarchicalTemplate
{
public class DistrictNodeViewModel : ModelCommon.NotifyObject
{
private bool? isSelected = false;
public bool? IsSelected
{
get { return isSelected; }
set
{
isSelected = value;
RaisePropertyChanged("IsSelected");
}
}
private bool? isChecked = false;
public bool? IsChecked
{
get { return isChecked; }
set
{
SetIsChecked(value);
}
}
private void SetIsChecked(bool? value)
{
if (value != isChecked)
{
isChecked = value;
RaisePropertyChanged("IsChecked");
}
if (this.Children.Count > 0 && this.Children[0].isChecked != value)
{
//设置子节点勾选状态
foreach (var item in this.Children)
{
if (value!=null)
{
item.IsChecked = value;
}
}
}
if (this.parent != null)
{
if (this.Parent.Children.Count == this.Parent.Children.Count(item => item.isChecked == value))
{
//同一级节点全部选中，则父节点选中。反之亦然。
this.Parent.IsChecked = value;
}
else if (this.Parent.Children.Count > this.Parent.Children.Count(item => item.isChecked == value))
{
if (this.Parent.IsChecked!=null)
{
this.Parent.IsChecked = null;
}
}
}
}
private bool? isExpand = false;
public bool? IsExpand
{
get { return isExpand; }
set
{
isExpand = value;
RaisePropertyChanged("IsExpand");
}
}
private BitmapImage img;
public BitmapImage Img
{
get { return img; }
set
{
img = value;
RaisePropertyChanged("Img");
}
}
private ObservableCollection<DistrictNodeViewModel> children = new ObservableCollection<DistrictNodeViewModel>();
public ObservableCollection<DistrictNodeViewModel> Children
{
get { return children; }
set
{
children = value;
RaisePropertyChanged("Children");
}
}
private DistrictNodeViewModel parent;
public DistrictNodeViewModel Parent
{
get { return parent; }
set
{
parent = value;
RaisePropertyChanged("Parent");
}
}
private District district;
public District District
{
get { return district; }
set
{
district = value;
RaisePropertyChanged("District");
}
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Collections.ObjectModel;
namespace WpfHierarchicalTemplate
{
public class DistrictMainViewModel : ModelCommon.NotifyObject
{
private ObservableCollection<DistrictNodeViewModel> vmNodes;
public ObservableCollection<DistrictNodeViewModel> VmNodes
{
get { return vmNodes; }
set
{
vmNodes = value;
RaisePropertyChanged("VmNodes");
}
}
public DistrictMainViewModel()
{
this.VmNodes = new ObservableCollection<DistrictNodeViewModel>
{
LoadData()
};
}
public DistrictNodeViewModel LoadData()
{
ObservableCollection<District> rootNodes =new ObservableCollection<District>();
District d00 = new District()
{
Xzqhmc = "全国",
Parent = null
};
District d0 = new District()
{
Xzqhmc="河南",
Parent=d00
};
District d1 = new District()
{
Xzqhmc = "北京",
Parent = d00
};
District d2 = new District()
{
Xzqhmc = "山东",
Parent = d00
};
District d11 = new District()
{
Xzqhmc = "海淀区",
Parent = d1
};
District d12 = new District()
{
Xzqhmc = "石景山区",
Parent = d1
};
District d13 = new District()
{
Xzqhmc = "朝阳区",
Parent = d1
};
District d01 = new District()
{
Xzqhmc = "商丘",
Parent = d0
};
District d02 = new District()
{
Xzqhmc = "郑州",
Parent = d0
};
District d03 = new District()
{
Xzqhmc = "周口",
Parent = d0
};
d1.Children = new List<District> { d11, d12, d13 };
d0.Children = new List<District> { d01, d02, d03 };
d00.Children = new List<District>{d1,d2,d0};
rootNodes.Add(d00);
DistrictNodeViewModel dnv = new DistrictNodeViewModel();
dnv.District = rootNodes[0];
SetDNV(dnv, rootNodes[0]);
return dnv;
}
private void SetDNV(DistrictNodeViewModel vm,District root)
{
if (root==null||root.Children==null||root.Children.Count==0)
{
return;
}
foreach (var item in root.Children)
{
DistrictNodeViewModel vmNew = new DistrictNodeViewModel();
vmNew.District = item;
vmNew.Parent = vm;
vmNew.Img = new System.Windows.Media.Imaging.BitmapImage(new Uri("/dog.jpg", UriKind.Relative));
vm.Children.Add(vmNew);
SetDNV(vmNew, item);
}
}
}
}
3、主窗口
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4、前台xaml
<Window x:Class="WpfHierarchicalTemplate.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<HierarchicalDataTemplate x:Key="treeTemplate" ItemsSource="{Binding Children}">
<StackPanel Orientation="Horizontal">
<CheckBox IsChecked="{Binding IsChecked}"></CheckBox>
<Image Source="{Binding Img}" Height="20" Width="16"></Image>
<TextBlock Text="{Binding District.Xzqhmc}"></TextBlock>
</StackPanel>
</HierarchicalDataTemplate>
</Window.Resources>
<Grid>
<TreeView ItemTemplate="{StaticResource treeTemplate}" ItemsSource="{Binding VmNodes}">
</TreeView>
</Grid>
</Window>
二、效果
