Question

I have a simple combobox with a checkbox inside as such:

<ComboBox Height="23" HorizontalAlignment="Left" Margin="158,180,0,0" Name="comboBox1" VerticalAlignment="Top" Width="120" ItemsSource="{Binding collection}">
        <ComboBox.ItemTemplate>
            <DataTemplate>
                <StackPanel Orientation="Horizontal">
                    <CheckBox Content="{Binding Name}"></CheckBox>
                </StackPanel>
            </DataTemplate>
        </ComboBox.ItemTemplate>
    </ComboBox>

The datacontext is simply the code behind, and to test it I use the following code:

public ObservableCollection<Foo> collection { get; set; }

    private void button1_Click(object sender, RoutedEventArgs e)
    {
        collection = new ObservableCollection<Foo>();
        this.comboBox1.ItemsSource = collection;
        Foo f = new Foo("DSD");
        collection.Add(f);
    }

When I set the ItemsSource as I have in the code, then it works fine, but I want to set the ItemsSource in the Xaml, however it does not work using the Xaml above. I have also tried setting it to Path = “”. Anybody know why?

Thanks

Answer 1

You need to assign DataContext to the control. something like:

var window = new Window1();
window.DataContext = new WindowDC();
window.Show();

where Window1 class contains the combobox, and WindowDC is like:

public class WindowDC
{ 
   public ObservableCollection<Foo> collection { get; set; }
}

That’s how this will work.

What you actually do is that you place collection into control class, and set your datacontext for combobox only.

But, for testing purposes, you can still set Combox.Datacontext in control constuctor.