How do I know when a binding is complete?

Question

I have a CombBox like below:

<ComboBox x:Name="fileTypeListBox"
          ItemsSource="{x:Bind local:App.fileCategories}"
          SelectedValuePath="Code"
          SelectionChanged="fileTypeListBox_SelectionChanged">
     <ComboBox.ItemTemplate>
        <DataTemplate>
            <StackPanel Orientation="Horizontal">
                <TextBlock Text="{Binding Path=Name}"/>
            </StackPanel>
        </DataTemplate>
    </ComboBox.ItemTemplate>
</ComboBox>

Now I want to do something when the listbox is done with its ItemsSource databinding (visual tree is done), how do I get notified?

Answer 1

To get notified when the ComboBox has finished its databinding and the visual tree is fully constructed, you can use the Loaded event. The Loaded event occurs when a FrameworkElement has been constructed and added to the object tree and is ready for interaction. Here's how you can implement it in your XAML:

xamlCopy code
<ComboBox x:Name="fileTypeListBox"
          ItemsSource="{x:Bind local:App.fileCategories}"
          SelectedValuePath="Code"
          SelectionChanged="fileTypeListBox_SelectionChanged"
          Loaded="fileTypeListBox_Loaded">
     <ComboBox.ItemTemplate>
        <DataTemplate>
            <StackPanel Orientation="Horizontal">
                <TextBlock Text="{Binding Path=Name}"/>
            </StackPanel>
        </DataTemplate>
    </ComboBox.ItemTemplate>
</ComboBox>

And in your code-behind (assuming C#):

csharpCopy code
private

Within the fileTypeListBox_Loaded event handler, you can implement any logic that you want to execute once the ComboBox has completed its databinding and the visual tree is fully constructed.