I am trying to display filenames in a listbox, retrieved from a particular directory. They are stored in an ObservableCollection of FileInfo objects:
public ObservableCollection<FileInfo> ProjectFiles
{
get
{
if (SelectedFolder == null) return null;
DirectoryInfo d= new DirectoryInfo(SelectedFolder);
if (!d.Exists) return null;
return new ObservableCollection<FileInfo>(d.EnumerateFiles("*.xsi"));
}
}
I have implemented a filter on the listbox, called when text is entered or changed in a textbox "FilesFilterBy":
private void FilterFiles_TextChanged(object sender, TextChangedEventArgs e)
{
ICollectionView view = CollectionViewSource.GetDefaultView(ProjectFiles);
view.Filter = new Predicate<object>(IsTextInFilename);
}
public bool IsTextInFilename(object item)
{
string Filename = Path.GetFileNameWithoutExtension((item as FileInfo).Name);
return (Filename.ToLower().Contains(FilesFilterBy.Text.ToLower()));
}
At the same time, I want to display only the names of the files, without path or extension. To this end I have implemented a converter:
public class RemoveExtensionConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
return Path.GetFileNameWithoutExtension(value as string);
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return new NotImplementedException();
}
}
Here is how the listbox is implemented in XAML:
<Window.Resources>
<ctr:RemoveExtensionConverter x:Key="JustFileName" />
</Window.Resources>
<ListBox ItemsSource="{Binding ProjectFiles}" >
<ListBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding FullName, Converter={StaticResource JustFileName}}" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
Currently the converter works - only the file names are listed, but the filter no longer has any effect. When I enter text in the FileFilterBy textbox the TextChanged event is fired but the listbox stays the same. Also, the converter is not called at that point.
What am I doing wrong?