Why my WPF binding not work?
I trying to bind List to Listbox. And at the Button1Click method new instance of MyClass adds in my List<>, but that not visible in my listbox. There my code:
public static class NotesEngine
{
public static List<Note> All;
static NotesEngine()
{
All = new List<Note>
{
new Note
{
Content = "test1",
}
};
}
public static List<Note> GetNotes()
{
return All;
}
}
It is my form episode and ObjectDataProvider:
<Ob开发者_如何转开发jectDataProvider ObjectType="{x:Type NotesEngine}" x:Key="NotesList" MethodName="GetNotes"/>
......
<TabItem Header="test" DataContext="{Binding Source={StaticResource NotesList}}">
<ListBox HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
ItemTemplate="{StaticResource NotesListBoxDataTemplate}"
ItemsSource="{Binding }">
</ListBox>
</TabItem>
private void button2_Click(object sender, RoutedEventArgs e)
{
NotesEngine.All.Add(new Note
{
Content = "xx",
Images = new List<string>(),
LastEdit = DateTime.Now,
Title = "XASAC",
});
}
What I do wrong?
You should use ObservableCollection<Node>
instead of List<Node>
. ObservableCollection is a generic dynamic data collection that provides notifications (using an interface "INotifyCollectionChanged
") when items get added, removed, or when the whole collection is refreshed. List does not implements INotifyCollectionChanged
, which interface is used by WPF ListBox to update UI.
see
- ObservableCollection<(Of <(T>)>) Class
- An Introduction to ObservableCollection in WPF
- List vs ObservableCollection vs INotifyPropertyChanged in Silverlight
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