I currently have an Entity that has a collection property on it. I want to know if why would the SelectionChanged only fire once and it won't trigger the SelectionChanged again once I try to select the item that was previously selected.
MainWindowViewModel
public MainWindowViewModel()
{
var a = new List<Test>();
a.Add(new Test() { Name = "Leo", Test1 = new List<Test1> { new Test1() { Content = "aaa"} } });
a.Add(new Test() { Name = "2", Test1 = new List<Test1> { new Test1() { Content = "bbb"} } });
a.Add(new Test() { Name = "Le33o", Test1 = new List<Test1> { new Test1() { Content = "ccc"} } });
A = a;
}
private List<Test> _a;
public List<Test> A
{
get { return _a; }
set { _a = value; OnPropertyChanged("A");}
}
protected void OnPropertyChanged(string name)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(name));
}
}
public event PropertyChangedEventHandler PropertyChanged;
My Mainwindow
public MainWindow()
{
InitializeComponent();
this.DataContext = new MainWindowViewModel();
}
private void Test(object sender, SelectionChangedEventArgs e)
{
}
My listbox structure
public class Test
{
public List<Test1> Test1 { get; set; }
public string Name
{
get;set;
}
}
public class Test1
{
public string Content { get; set; }
}
I select the first object, the event fires, I select the second object, the event fires, I select the first object, the event doesn't fire, I select third object, the event fires. It seems like it only triggers and calls the event once.
My XAML Code:
<ItemsControl x:Name="Lists" ItemsSource="{Binding A}" Grid.Row="1">
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock Text="{Binding Name}" FontWeight="Bold"
Style="{StaticResource DefaultTextBlockStyle}" />
<ListBox SelectionChanged="Test" ItemsSource="{Binding Test1}"
Margin="5,0,0,0" ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Content}" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</StackPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
The test method is just an empty method I just want to hit the breakpoint every time I change.
private void Test(object sender, SelectionChangedEventArgs e)
{
}
Update 1: I tried to reproduce this in a simple WPF app, it seems that the ListBoxItem is getting IsEnabled to false but I snooped it and all the controls are enabled. It just getting a grey background that looks like disabled. Will try to investigate further.
Update 2: It seems that the ListBoxItem IsSelected property is not being unset when you change an item.
