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I am having no luck finding out what I am doing wrong. I made a user control that has a List<string> for a dependency property. When I data bind to that property, nothing is in the list. I used the same data to bind to a ComboBox and it shows the list just fine.

Here is my dependency property:
public List<string> ValueList
  get { return (List<string>)GetValue(ValueListProperty); }
  set { SetValue(ValueListProperty, value); }

// Using a DependencyProperty as the backing store for ValueList.  This enables animation, styling, binding, etc...
public static readonly DependencyProperty ValueListProperty =
    DependencyProperty.Register("ValueList", typeof(List<string>), 
                                             new FrameworkPropertyMetadata
                                               DefaultValue = new List<string>(),
                                               DefaultUpdateSourceTrigger = System.Windows.Data.UpdateSourceTrigger.PropertyChanged,

Here is my data object that I am trying to bind:
private ObservableCollection<string> _valueList1 = new ObservableCollection<string>();
/// <summary>
/// List of items for Valueboxes that display a list of items.
/// </summary>
public ObservableCollection<string> ValueList1
    return _valueList1;
    if (value != _valueList1)
      _valueList1 = value;
It gets populated in the code behind with several values, which I noticed does not fire the Set, but it works with the combobox so I assume that is not the problem.

Here is the XAML for the control. The ComboBox works, my control does not see anything in the ValueList property:
<ComboBox Width="120" 
                       ItemsSource="{Binding ValueList1}"
                       Text="{Binding Label1}"
<uc:UserControl Value="Test" 
                             ValueList="{Binding ValueList1}"/>

Now if I put the data in the control in the XAML, it works fine:
<uc:UserControl Value="Yes" 

1 solution

There is a mismatch between the dependency property (List<string>) type and the data object (ObservableCollection<string>).

Still not sure why the combobox was ok with this and my control wasn't unless there is a built-in converter for the combobox.
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