Wpf DataGrid SelectedItem在單元格編輯後失去綁定

我有一個DataGrid綁定到項目集合（規則）。如果我在DataGrid中手動編輯這些項目之一，看起來好像網格上的SelectedItem綁定停止工作（控制器中的RuleListViewModelPropertyChanged永遠不會再被調用）。但只有當我實際改變單元格中的項目的值時，否則SelectedItem會繼續按照它應該的方式工作。Wpf DataGrid SelectedItem在單元格編輯後失去綁定

我已經剝去了一些不相關的東西的代碼，所以這基本上就是我所擁有的。首先，我有以下DataGrid：

<DataGrid x:Name="RuleTable" Grid.Row="1" Grid.ColumnSpan="2" ItemsSource="{Binding Rules}" SelectedItem="{Binding SelectedRule, Mode=TwoWay}" 
       BorderThickness="0" > 
     <DataGrid.Columns> 
      <DataGridTextColumn Binding="{Binding TargetValue, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True, 
            ValidatesOnExceptions=True, NotifyOnValidationError=True}" 
           Header="{x:Static p:Resources.TargetValue}" Width="*" ElementStyle="{StaticResource TextCellElementStyle}" 
           EditingElementStyle="{StaticResource TextCellEditingStyle}"/> 
     </DataGrid.Columns> 
    </DataGrid>

隨着ViewModel，看起來像這樣：

public class RuleListViewModel : ViewModel<IRuleListView> 
{ 
    private IEnumerable<Rule> rules; 
    private Rule selectedRule; 

    public RuleListViewModel(IRuleListView view) 
     : base(view) 
    { 
    } 

    public RuleListViewModel() : base(null) {} 

    public IEnumerable<Rule> Rules 
    { 
     get 
     { 
      return rules; 
     } 
     set 
     { 
      if (rules != value) 
      { 
       rules = value; 
       RaisePropertyChanged("Rules"); 
      } 
     } 
    } 

    public Rule SelectedRule 
    { 
     get 
     { 
      return selectedRule; 
     } 
     set 
     { 
      if (selectedRule != value) 
      { 
       selectedRule = value; 
       RaisePropertyChanged("SelectedRule"); 
      } 
     } 
    } 
}

最後一個Controller，看起來像這樣：

public class RuleController : Controller 
{ 
    private readonly IShellService shellService; 
    private readonly RuleListViewModel ruleListViewModel; 

    private readonly DelegateCommand addRuleCommand; 
    private readonly DelegateCommand deleteRuleCommand; 

    [ImportingConstructor] 
    public RuleController(IShellService shellService, IEntityService entityService, RuleListViewModel ruleListViewModel) 
    { 
     this.shellService = shellService; 
     this.ruleListViewModel = ruleListViewModel; 
    } 

    public void Initialize() 
    { 
     AddWeakEventListener(ruleListViewModel, RuleListViewModelPropertyChanged); 
     shellService.RuleListView = ruleListViewModel.View; 

     List<Rule> rules = GetRules(); 
     ruleListViewModel.Rules = new ObservableCollection<Rule>(rules); 
    } 

    private void RuleListViewModelPropertyChanged(object sender, PropertyChangedEventArgs e) 
    { 
     if (e.PropertyName == "SelectedRule") 
     { 
      // This never gets called after edit 
     } 
    } 
}

我也實在沒有想法是什麼問題，但因爲我實際上不得不改變價值體驗這種行爲（只有單擊單元格，而不是編輯任何工程f ine）我猜測它與SelectedItem綁定破解有關，當我改變綁定到它的項目的值時！

來源

2013-01-10 Joel