Hi all,
I have a strange situation where the ItemsSource property on a combo box won't
OneWay bind to
the data source. That is, after the initial bind to the ItemsSource bound
property, I change the
contents of that bound collection, call the PropertyChanged event for that
property, but it doesn't
update the combo box list.
Here's the resource:
<navigation:Page.Resources>
<lst:ListProvider x:Key="ListProvider" d:IsDataSource="True" />
</navigation:Page.Resources>
Here's the Combo Box declaration:
<ComboBox Grid.Row="0" Grid.Column="1"
x:Name="cmbTermCategory"
ItemsSource="{Binding Path=TermCategoryList, Mode=OneWay,
Source={StaticResource
ListProvider}}"
Style="{StaticResource ComboBoxStyle}" Height="24"
DisplayMemberPath="Description"
/>
Here's the ListProvider class: (hopefully only irrelevant code removed)
public sealed class ListProvider : INotifyPropertyChanged
{
private ObservableCollection<ListValue> moTermCategoryList
= new ObservableCollection<ListValue>();
public ObservableCollection<ListValue> TermCategoryList
{
get
{
return moTermCategoryList;
}
set
{
moTermCategoryList = value;
OnPropertyChanged("TermCategoryList");
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
#endregion // INotifyPropertyChanged Members
}
When the screen loads, it initially calls the bind to the TermCategoryList
property. At that time the
list is empty. I make a database call to populate the list and when it is
finished, I call
OnPropertyChanged("TermCategoryList"). I would have thought that this would
cause the bind to
be refired and the get should re-execute, but it doesn't.
In fact, the PropertyChanged event is not even set - it's null.
...snip from within my OnLoadCompleted async callback method:
moTermCategoryList.Clear();
foreach (ListValue item in poLoadOperation.Entities)
{
moTermCategoryList.Add(item);
}
OnPropertyChanged("TermCategoryList");
Any idea what I might be missing?
Regards,
Tony
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