采用MVVM方式实现WPF的TreeView

至于什么是MVVM，其优势是什么，不在此介绍，直接说明实现：

1）后台代码

分为三个类：

（1）MainWindow，里面只有两行代码，关键实现是对DataContext赋值，那么所赋的值是什么呢？这便是第二个类：

（2）PropertyNodeItemViewModel，该类继承于NotificationObject；而NotificationObject为通知类，当属性更改时自动提交更改通知；该类主要模拟树节点；当属性PropertyNodeItems变化时会实现自动提交；该类属于ViewModel

（3）PropertyNodeItem，树节点组成元素，属于Model；
 

namespace EquipmentManagement
{
    /// 

    /// MainWindow.xaml 的交互逻辑
    /// 
    public partial class MainWindow : Window
    {
 
        public MainWindow()
        {
            InitializeComponent();
 
            this.DataContext = new PropertyNodeItemViewModel();
        }
 
    }
 
    internal class PropertyNodeItemViewModel : TaianSUCCEED.Practices.ViewModels.NotificationObject
    {
        private readonly string FOLDER_ICON = @"C:\Users\Pictures\png\TrayMenuPlay.png";
        private readonly string TAG_ICON = @"C:\Users\Pictures\png\TrayMenuPaused.png";
        private readonly string EDITABLE_ICON = @"C:\Users\Pictures\png\TrayMenuLogin.png";
 
        private List _propertyNodeItems;
 
        public List PropertyNodeItems
        {
            get { return _propertyNodeItems; }
            set
            {
                _propertyNodeItems = value;
                this.RaisePropertyChanged("PropertyNodeItems");
            }
        }
 
        public PropertyNodeItemViewModel()
        {
            PropertyNodeItems = ShowTreeView();
        }
 
 
        private List ShowTreeView()
        {
            List itemList = new List();
 
            PropertyNodeItem node1 = new PropertyNodeItem()
            {
 
                DisplayName = "Node No.1",
 
                Name = "This is the discription of Node1. This is a folder.",
 
                Icon = FOLDER_ICON,
 
            };
 
 
 
            PropertyNodeItem node1tag1 = new PropertyNodeItem()
 
            {
 
                DisplayName = "Tag No.1",
 
                Name = "This is the discription of Tag 1. This is a tag.",
 
                Icon = TAG_ICON,
 
                EditIcon = EDITABLE_ICON
 
            };
 
            node1.Children.Add(node1tag1);
 
 
 
            PropertyNodeItem node1tag2 = new PropertyNodeItem()
 
            {
 
                DisplayName = "Tag No.2",
 
                Name = "This is the discription of Tag 2. This is a tag.",
 
                Icon = TAG_ICON,
 
                EditIcon = EDITABLE_ICON
 
            };
 
            node1.Children.Add(node1tag2);
 
            itemList.Add(node1);
 
 
 
            PropertyNodeItem node2 = new PropertyNodeItem()
 
            {
 
                DisplayName = "Node No.2",
 
                Name = "This is the discription of Node 2. This is a folder.",
 
                Icon = FOLDER_ICON,
 
            };
 
 
 
            PropertyNodeItem node2tag3 = new PropertyNodeItem()
 
            {
 
                DisplayName = "Tag No.3",
 
                Name = "This is the discription of Tag 3. This is a tag.",
 
                Icon = TAG_ICON,
 
                EditIcon = EDITABLE_ICON
 
            };
 
            node2.Children.Add(node2tag3);
 
 
 
            PropertyNodeItem node2tag4 = new PropertyNodeItem()
 
            {
 
                DisplayName = "Tag No.4",
 
                Name = "This is the discription of Tag 4. This is a tag.",
 
                Icon = TAG_ICON,
 
                EditIcon = EDITABLE_ICON
 
            };
 
            node2.Children.Add(node2tag4);
 
            itemList.Add(node2);
 
            return itemList;
 
            //this._tvProerties.ItemsSource = itemList;
 
        }
    }
 
    internal class PropertyNodeItem
    {
 
        public string Icon{get;set;}
 
        public string EditIcon { get; set; }
 
        public string DisplayName { get; set; }
 
        public string Name { get; set; }
 
        public List Children { get; set; }
 
        public PropertyNodeItem()
        {
            Children = new List();
        }
    }
}

类NotificationObject：

public abstract class NotificationObject: INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
 
        protected virtual void RaisePropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                this.PropertyChanged.Invoke(this, new PropertyChangedEventArgs(propertyName));
            }
        }
 
   。。。。
    }

2）前台View实现

 

这里特别注意的是采用模板方式，其中TreeView的ItemsSource绑定的属性PropertyNodeItems，而HierarchicalDataTemplate的ItemsSource绑定的Children

3）附图实现样式