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How do you bind to the ComboBox in the DataTemplate?

I have a list associated with an Audio observable collection (custom class). The Audio class has two properties: DisplayText (string) and TarpIds (Observable Collection of Integer) property. I need to allow the user to change the TarpID in the combo box for each displayed list item and catch the selection change.

I created a DataTemplate that styles the DisplayText property from an Audio object and adds a ComboBox to display the available TarpIDs for that audio (they are dynamic and unique to each audio). DisplayText works fine, but I can't get the TarpIDs to display in the ComboBox.

Here's what I have so far and thanks for any help. FYI I have set an ItemSource at runtime that binds the ListUploadAudio to an observable audio collection.

<Border BorderBrush="Red" Background="WhiteSmoke" CornerRadius="8">
                <Border.Resources>
                    <DataTemplate x:Key="UploadLayout" DataType="Audio">
                        <StackPanel Orientation="Vertical">
                            <TextBlock Text="{Binding Path=DisplayText}" 
                        FontWeight="Bold" Foreground="Blue">
                            </TextBlock>                                
                                <ComboBox x:Name="ListBoxTarpIDs"
                                         ItemsSource="{Binding Path=TarpIds}">                                        
                                </ComboBox>                                                                              
                           </StackPanel>
                    </DataTemplate>

                </Border.Resources>
                    <ListBox x:Name="ListUploadAudio" BorderBrush="Transparent" 
                         Background="Transparent" Width="230" Margin="10" 
                         Height="200" IsSynchronizedWithCurrentItem="True" SelectionMode="Multiple"
                         ItemTemplate="{DynamicResource UploadLayout}">
                </ListBox>
            </Border>
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1 answer


For your ComboBox you need to bind SelectedValue

as well ItemsSource

.

As for your ComboBox not linking its items, your code looks correct. I suspect one of the following:

  • Error (e.g. TarpIds vs TarpIDs)
  • Incorrectly defined setting (e.g. missing getter)
  • ListUploadAudio.ItemsSource not configured to expected value


If that doesn't work, I suggest you post your code, specifically the definition of your TarpIds property and the location where you set the ListUploadAudio.ItemsSource

As a side note: you don't need Path = in your bindings unless you are using namespaces.

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