2010-07-02 222 views
1

我正在使用WCF和MVVM模式来填充树视图控件,我需要选择的项目作为视图模型中的另一个方法的参数传递(以填充不同的控件)。WPF MVVM TreeView选择的项目不填充当前选择对象

treeview填充得很好,但选定的值没有被传递给视图模型。例如在视图模型:

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

<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> 

对这个有什么想法?
当我在方法“OnCollectionViewCurrentChanged”中设置断点时,当我单击一个树视图节点时什么也没有发生。即“CurrentSupplier”永远不会更新,所以我不能在另一个方法中使用CurrentSupplier(为另一个控件加载集合)。

感谢

回答

1
+0

明白了,放弃了应用,并使用这里所描述的架构工作: http://msdn.microsoft.com/en -us/magazine/dd419663.aspx 然后,treeview所选项目(SupplierID,PartID等)将用作GridView控件的ItemSource集合的输入。 看到这篇文章: http://tomlev2.wordpress.com/2009/04/17/wpf-binding-to-an-asynchronous-collection/ – 2010-07-26 18:37:42