WPF Listview SelectionChanged event

The listView should not fire the SelectionChange if you only set the ItemsSource property. However if you bind the SelectedIndex property to a property of your dataContext object the selection will move to the index that is specified by the binded property.

this doesn't fires the Selector_OnSelectionChanged event when the page loads:

<ListView SelectionChanged="Selector_OnSelectionChanged"                   ItemsSource="{Binding Path=Items}"                  ></ListView>

but this does:

<ListView SelectionChanged="Selector_OnSelectionChanged"                   SelectedIndex="{Binding Path=SelectedIndexValue}"                  ItemsSource="{Binding Path=Items}"                  ></ListView>

because the SelectedIndex is set to the SelecteIndexValue through binding.

To avoid this and still keep the bindings in your markup set the SelectedIndexValue of your dataContext object to -1 before binding (Before InitializeComponent() is called in your form constructor).

Hope this helps.

thanks for the responses.

When I put a breakpoint on the SelectionChanged event, it breaks proceedings there before the screen is fully loaded. You will also see that the first row is 'selected' afterwards on the list. I am not binding to a SelectedIndexValue as you can see in the code. The DataContext for the list is a ReadonlyCollection

In my SelectionChanged event as you can see I notify other objects to be loaded with data relating to the selected item. I only want this to happen when one is selected but not a default one to be set. I have to of these ListViews representing similar data but on loaded none must have an item selected.

I have noticed that the default Selected index is set to -1 on the properties window for the Listview. I can even set this is code on the List_Loaded event, but by then the first SelectionChanged has happened already.

<ListView PreviewMouseDown="ActiveCasesView_MouseDown" x:Name="ActiveCasesView"                     DataContext="{StaticResource ActiveCasesViewSource}"                     ItemsSource="{Binding}"                     ItemTemplate="{StaticResource CasesItemTemplate}"                     SelectionMode="Single"                     SelectionChanged="ActiveCasesView_SelectionChanged"                     ScrollViewer.CanContentScroll="True"                      ScrollViewer.VerticalScrollBarVisibility="Auto" ></ListView>private void ActiveCasesView_SelectionChanged(object sender, SelectionChangedEventArgs e)    {        if (mouseClicked)            if (e.AddedItems.Count > 0)                App.Messenger.NotifyColleagues(App.MSG_SELECT_ACTIVE_CASE, ((CaseViewModel)ActiveCasesView.SelectedItem).CaseNumber);    }

I added the PreviewMouseDown to set an indicator that I have clicked on the listview in the SelectionChanged event. This does help but I'm not convinced that its the best solution.

ThanksPetrus

I don't know if you still need help with this, but I solved this problem by making a variable that tracks the selectedindex, in my case -- when initially bound it's always 0 so it's a little easier for me to do, however if you inform the viewmodel of the appropriate index, I simply added a

ComboBox box = e.OriginalSource as ComboBox;if (_previousIndex == cb.SelectedIndex) return;//do stuff you need to do with a new SelectedIndex