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POAn ItemsControl is inconsistent with its items source - happening in nested ListView
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  1. POAn ItemsControl is inconsistent with its items source - happening in nested ListView
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    copied!<p>This given page shows all cities for a particular state. I am displaying a ListView within a ListView. The outer ListView shows a listing of cities. The inner ListView shows all notes attached to each particular city.</p> <p>Everything loads up properly. I can add a note, which gets added to the database. However, after adding a note, clicking the scroll bar in the NotesListView causes the exception: </p> <blockquote> <p>An ItemsControl is inconsistent with its items source</p> </blockquote> <p>I understand the problem...the listing of notes attached to the ListView becomes out of sync, after I add a note to the city.Notes property in the viewmodel... But how do I force this ListView to refresh?</p> <p>Here is my XAML (edited for brevity):</p> <pre><code>&lt;ListView x:Name="CityListView" ItemsSource="{Binding CityDetails, Mode=OneWay}"&gt; &lt;!--City Name and other city details. go here--&gt; &lt;ListView x:Name="NotesListView" ItemsSource="{Binding Notes}"&gt; &lt;TextBlock Text="{Binding Path=Note}" /&gt; &lt;/ListView&gt; &lt;StackPanel&gt; &lt;TextBlock Text="Add Note:" /&gt; &lt;TextBox Text="{Binding Path=DataContext.Note, RelativeSource={RelativeSource AncestorType=UserControl}}" /&gt; &lt;Button Content="ADD NOTE" Command="{Binding Path=DataContext.AddNoteCommand, RelativeSource={RelativeSource AncestorType=UserControl}}" CommandParameter="{Binding}" /&gt; &lt;/StackPanel&gt; &lt;/ListView&gt; </code></pre> <hr> <p>Here is the AddNote() method in the ViewModel that is hooked into the AddNoteCommand:</p> <pre><code>Protected _stateService As IStateService Protected _state As State Protected Sub OnAddNote(city As City) Dim note As Note = Nothing If Not String.IsNullOrWhiteSpace(Me.Note) Then note = New Note() With { .Note = Me.Note, .NoteDate = DateTime.Now, } city.Notes.Add(note) _stateService.SaveExistingState(_state) ' this saves the note, since _state contains: ' Property Cities As ICollection(Of City) ' and the city object passed into this method belongs to that collection... RaisePropertyChanged(Function() city.Notes) End If End Sub </code></pre>
 

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