WPF - How do I get an object that is bound to a ListBoxItem back
- by JonBlumfeld
Hi there
here is what I would like to do. I get a List of objects from a database and bind this list to a ListBox Control. The ListBoxItems consist of a textbox and a button. Here is what I came up with. Up to this point it works as intended.
The object has a number of Properties like ID, Name. If I click on the button in the ListBoxItem the Item should be erased from the ListBox and also from the database...
<ListBox x:Name="taglistBox">
<ListBox.ItemContainerStyle>
<Style TargetType="{x:Type ListBoxItem}">
<Setter Property="HorizontalAlignment" Value="Stretch"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListBoxItem">
<ContentPresenter HorizontalAlignment="Stretch"/>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="Tag" Value="{Binding TagSelf}"></Setter>
</Style>
</ListBox.ItemContainerStyle>
<ListBox.ItemTemplate>
<DataTemplate>
<Grid HorizontalAlignment="Stretch">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Button Grid.Column="0" Name="btTag" VerticalAlignment="Center" Click="btTag_Click" HorizontalAlignment="Left">
<Image Width="16" Height="16" Source="/WpfApplication1;component/Resources/104.png"/>
</Button>
<TextBlock Name="tbtagBoxTagItem" Margin="5" Grid.Column="1" Text="{Binding Name}" VerticalAlignment="Center" />
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
The Textblock.Text is bound to object.Name and the ListBoxItem.Tag to object.TagSelf (which is just a copy of the object itself).
Now my questions
If I click the button in the listboxItem how do I get the listboxitem and the object bound to it back. In order to delete the object from the database I have to retrieve it somehow. I tried something like
ListBoxItem lbi1 = (ListBoxItem)(taglistBox.ItemContainerGenerator.ContainerFromItem(taglistBox.Items.CurrentItem));
ObjectInQuestion t = (ObjectInQuestion) lbi1.Tag;
Is there a way to automatically update the contents of the ListBox if the Itemssource changes? Right now I'm achieving that by
taglistBox.ItemsSource = null;
taglistBox.ItemsSource = ObjectInQuestion;
I'd appreciate any help you can give :D
Thanks in advance
