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我在Silverlight論壇上發佈了這個問題，但一直沒有能夠得到答案來解決我的問題，所以我希望大師在SO可以提供幫助！Silverlight：Parent ViewModel屬性值爲Child ViewModel屬性
基本上我在我的父viewmodel有一個實體屬性。當這個實體改變時，我需要在我的子視圖模型中的實體的ID。我用一個依賴屬性創建了一個子控件，並在構造函數中創建了一個綁定。我正在嘗試使用MVVM和MEF來實現所有這些。
我ParentViewModel：
[ExportPlugin(ViewModelTypes.ParentViewModel, PluginType.ViewModel)]
[PartCreationPolicy(CreationPolicy.NonShared)]
public class ParentViewModel: ViewModelBase
{
private Person _currentPerson;
public Person CurrentPerson
{
get { return _currentPerson; }
private set
{
if (!ReferenceEquals(_currentPerson, value))
{
_currentPerson= value;
RaisePropertyChanged("CurrentPerson");
}
}
}
}
我ParentUserControl：
<UserControl x:Class="MyApp.ParentUserControl" x:Name="ParentControl">
<local:ChildUserControl PersonID="{Binding ElementName=ParentControl, Mode=TwoWay, Path=DataContext.CurrentPerson.ID}" />
</UserControl>
我ChildUserControl代碼隱藏：
public partial class ChildUserControl : UserControl
{
#region Private Properties
private PluginCatalogService _catalogService = PluginCatalogService.Instance;
#endregion
#region Dependency Properties
public static readonly DependencyProperty PersonIDProperty =
DependencyProperty.Register("PersonID", typeof(int), typeof(ChildUserControl), new PropertyMetadata(OnPersonIDChanged));
#endregion
#region Public Properties
public int PersonID
{
get { return (int)GetValue(PersonIDProperty); }
set { SetValue(PersonIDProperty, value); }
}
#endregion
#region Constructor
public ChildUserControl()
{
InitializeComponent();
if (!ViewModelBase.IsInDesignModeStatic)
this.DataContext = _catalogService.FindPlugin(ViewModelTypes.ChildViewModel, PluginType.ViewModel);
this.SetBinding(PersonIDProperty, new Binding("PersonID") { Mode = BindingMode.TwoWay, Source = DataContext, UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged });
}
#endregion
private static void OnPersonIDChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
...
}
我ChildViewModel：
[ExportPlugin(ViewModelTypes.ChildViewModel, PluginType.ViewModel)]
[PartCreationPolicy(CreationPolicy.NonShared)]
public class ChildViewModel: ViewModelBase
{
private int _personID;
public int PersonID
{
get { return _personID; }
set
{
if (!ReferenceEquals(_personID, value))
{
_personID= value;
RaisePropertyChanged("PersonID");
}
}
}
}
我創建了OnPersonIDChanged事件以查看CurrentPerson實體是否更改，更改是在ChildControl中找到的，它是。它只是不被ChildControl ViewModel拾起。
任何幫助，非常感謝。