WPF MVVM TreeView 选定项未填充当前选择对象

Question

我正在使用 WCF 和 MVVM 模式来填充树视图控件，并且我需要将所选项目作为参数传递给视图模型中的另一个方法（以填充不同的控件）。

树视图填充得很好，但选定的值没有传递给视图模型。例如在视图模型中：

    private ICollectionView m_SuppliersView;
    public ObservableCollection<SupplierItem> SupplierItems
    {
        get
        {
            return supplierItems;
        }
        private set
        {
            if (supplierItems == value)
            {
                return;
            }
            supplierItems = value;
            OnPropertyChanged("SupplierItems");
        }
    }
    public SupplierItem CurrentSupplier
    {
        get
        {
            if (m_SuppliersView != null)
            {
                return m_SuppliersView.CurrentItem as SupplierItem;
            }

            return null;
        }
    }
   private void OnCollectionViewCurrentChanged(object sender, EventArgs e)
    {
// view model is inherited from a base class.  base method listed below
        OnPropertyChanged("CurrentSupplier");   
    }

   protected virtual void OnPropertyChanged(string propertyName)
    {
        VerifyPropertyName(propertyName);

        var handler = PropertyChanged;
        if (handler != null)
        {
            var e = new PropertyChangedEventArgs(propertyName);
            handler(this, e);
        }
    }

    private void Load() // Load event to populate the treeview source object
    { 
// SupplierItems object is populated just fine and treeview displays just fine so I won't show how the sausage is made.   I believe the issue is here:  
        m_SuppliersView = CollectionViewSource.GetDefaultView(SupplierItems);

        if (m_SuppliersView != null)
        {
            m_SuppliersView.CurrentChanged += OnCollectionViewCurrentChanged;
        }

        OnPropertyChanged("CurrentSupplier");

在 xaml 中：

<Window.Resources>
       <HierarchicalDataTemplate x:Key="SuppiersDistributorsTemplate" ItemsSource="{Binding Children}">
          <TextBlock Text="{Binding ManagedLocationName}"/>
       </HierarchicalDataTemplate>
</Window.Resources>


<TreeView x:Name="tvSuppliers" ItemsSource="{Binding SupplierItems}" 
          ItemTemplate="{StaticResource SuppiersDistributorsTemplate}" 
          SelectedValuePath="CurrentSupplier">              
</TreeView>

对此有什么想法吗？
当我在“OnCollectionViewCurrentChanged”方法中设置断点时，当我单击树视图节点时什么也没有发生。即“CurrentSupplier”永远不会更新，所以我不能在我拥有的另一种方法中使用 CurrentSupplier（为另一个控件加载集合）。

谢谢

Answer 1

这个解决方案对我有用：

http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/cc73893a-3383-4328-a002-ed8fb002a19d