WPF ListBox selection does not work

Question

I have a ListBox for a few items, and I need to be able to click them. Problem is, the SelectionChanged event doesn't get fired when I click on the item's text, only if I click on the blank part. I'm quite new to WPF, and I don't understand why this is happening.

XAML:

<ListBox Name="lBoxVouchers" BorderThickness="0" FontSize="15" SelectionChanged="lBoxVouchers_SelectionChanged">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <ListBoxItem Content="{Binding Name}" />
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

Handler:

private void lBoxVouchers_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    if (e.AddedItems.Count > 0)
        MessageBox.Show("You just selected " + e.AddedItems[0]);
}

I'm binding the list of objects in code via the lBoxVouchers.ItemsSource property, and they show up. Each object has a Name property, of course.

I've tried setting IsEnabled on the ListBox and the items, both in code and XAML, but it doesn't help.

Any comments about better ways to do this in WPF are also welcome.

dcarneiro · Accepted Answer · 2010-11-15 12:52:01Z

2

If you only want to show the Name property you could define your listbox like this:

<ListBox Name="lBoxVouchers" BorderThickness="0" FontSize="15" SelectionChanged="lBoxVouchers_SelectionChanged" DisplayMemberPath="Name" />

If you put your items on an ObservableCollection on code-behind, you can also pass the databinding to XAML:

<ListBox Name="lBoxVouchers" BorderThickness="0" FontSize="15" SelectionChanged="lBoxVouchers_SelectionChanged" DisplayMemberPath="Name" ItemsSource={Binding Path=Items}" />

And on your code behind you should have something like:

ObservableCollection<object> Items {get; set}

About the handler, I would also do something like this:

private void lBoxVouchers_SelectionChanged(object sender, SelectionChangedEventArgs e) {
    if (((ListBox)sender).SelectedItem != null)
        MessageBox.Show("You just selected " + (ListBox)sender).SelectedItem);
}

answered Nov 15, 2010 at 12:52

dcarneiro

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5 Comments

Liviu Mandras Over a year ago

He already said that he managed to make the data binding and tthe items show up. You did not answer the question just shown a different way to realize the same goal.

Edgar Over a year ago

Which is good because I said I'd appreciate any helpful comments about my code.

Edgar Over a year ago

Using the DisplayMemberPath property fixed it. Still have no idea why it didn't work the other way.

dcarneiro Over a year ago

I think that Ed previous code wasn't working because he was redefining the listBox DataTemplate and probably overriding some events. I just show him the way I normally implement this kind of problem

sudarsanyes Over a year ago

A better way of achieving this is explained over here, social.msdn.microsoft.com/Forums/en/wpf/thread/…

Liviu Mandras · Accepted Answer · 2010-11-15 12:51:14Z

0

Set IsSynchronizedWithCurrentItem="true" on the listbox.

Here you can find a starting point to get more details about this property.

Setting this property to true makes the selection be in sync with the current item which holds the actual selected item. When you click the blank space probably the current item changes to null and you get your event handler called.

edited Nov 15, 2010 at 12:51

answered Nov 15, 2010 at 12:35

Liviu Mandras

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Comments

Kishore Kumar · Accepted Answer · 2010-11-15 13:05:52Z

0

may be the content in the listbox item is not stretched. just write this style for the listbox item and try.

<Style TargetType="{x:Type ListBoxItem}">
  <Setter Property="HorizontalContentAlignment" Value="Stretch" />
</Style>

answered Nov 15, 2010 at 13:05

Kishore Kumar

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