我有以下情况：
XAML：
<ListView Name="lsv_edit_selectNode" Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="4"
Grid.RowSpan="17" IsSynchronizedWithCurrentItem="True" SelectionMode="Single"
ItemsSource="{Binding Path=Nodes.CollectionView, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, ValidatesOnNotifyDataErrors=True}">
其中 Nodes 是ObservableCollection包含 ListCollectionView 的自定义：
Public Class FilterableObservableCollection(Of T)
Inherits ObservableCollection(Of T)
Implements INotifyPropertyChanged, INotifyCollectionChanged
Public Property CollectionView As ListCollectionView
Get
Return _collectionView
End Get
Protected Set(value As ListCollectionView)
If value IsNot _collectionView Then
_collectionView = value
NotifyPropertyChanged()
End If
End Set
End Property
'etc.
T在这种情况下是一个Node对象，具有许多属性，包括我感兴趣的属性（称为 NodeResults）：
Public Class Node
Inherits ObservableValidatableModelBase
Public Property NodeResults as NodeResults
Set
SetAndNotify(_nodeResults, Value) ' INotifyPropertyChanged
AddHandler _nodeResults.ErrorsChanged, AddressOf BubbleErrorsChanged ' INotifyDataErrorInfo?
End Set
End Property
' etc.
和NodeResults：
Public Class NodeResults
Inherits ObservableValidatableModelBase
' many properties here, each validated using custom Data Annotations. This works, when I bind a text box directly to here, for example.
ObservableValidatableModelBase实现INotifyDataErrorInfo，并将其错误存储在一个名为的集合中errors：
Private errors As New Dictionary(Of String, List(Of String))()
Public ReadOnly Property HasErrors As Boolean Implements INotifyDataErrorInfo.HasErrors
Get
Return errors.Any(Function(e) e.Value IsNot Nothing AndAlso e.Value.Count > 0)
End Get
End Property
Public Function GetErrors(propertyName As String) As IEnumerable Implements INotifyDataErrorInfo.GetErrors
Try
If Not String.IsNullOrEmpty(propertyName) Then
If If(errors?.Keys?.Contains(propertyName), False) _
AndAlso If(errors(propertyName)?.Count > 0, False) Then ' if there are any errors, defaulting to false if null
Return errors(propertyName)?.ToList() ' or Nothing if there are none.
Else
Return Nothing
End If
Else
Return errors.SelectMany(Function(e) e.Value.ToList())
End If
Catch ex As Exception
Return New List(Of String)({"Error getting errors for validation: " & ex.Message})
End Try
End Function
Public Event ErrorsChanged As EventHandler(Of DataErrorsChangedEventArgs) Implements INotifyDataErrorInfo.ErrorsChanged
Public Sub NotifyErrorsChanged(propertyName As String)
ErrorsChangedEvent?.Invoke(Me, New DataErrorsChangedEventArgs(propertyName))
End Sub
Public Sub BubbleErrorsChanged(sender As Object, e As DataErrorsChangedEventArgs)
If TypeOf (sender) Is ObservableValidatableModelBase Then
errors = DirectCast(sender, ObservableValidatableModelBase).errors
End If
NotifyErrorsChanged(String.Empty)
End Sub
我想要发生的是让Nodes 中的个人CollectionView通知，以便它在屏幕上ListView突出显示无效的个人条目（即具有无效的 a ）。NodeResults
我的第一直觉是 Node 需要以某种方式订阅和冒泡NodeResults'ErrorsChanged事件，因此类BubbleErrorsChanged上的方法ObservableValidatableModelBase- 但这似乎不起作用。
另一种可能性是 - ListView 是否甚至有用于显示验证异常的默认模板？如果没有，这样的事情应该有效吗？（它没有……）
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="Background" Value="{Binding Path=(Validation.Errors).CurrentItem, Converter={StaticResource ValidationExceptionToColourConverter}}"/>
</Style>
</ListView.ItemContainerStyle>
ValidationExceptionToColourConverter根据错误是否存在，只需返回 Brushes.Red 或 Brushes.White即可Nothing。
注意：将文本框直接绑定到 Nodes.NodeResults.SomeProperty 可以正常工作，给出我期望的结果。