I created a couple of attached properties which handle this issue. I hope this comes in handy for someone! First – a simple interface for your directionalised comparer. This extends IComparer but gives us one more property (SortDirection). Your implementation should use this to determine the correct ordering of elements (which would otherwise have been … Read more
You have two options to use CollectionViewSource properly with MVVM – Expose an ObservableCollection of items (Categories in your case) through your ViewModel and create CollectionViewSource in XAML like this – <CollectionViewSource Source=”{Binding Path=Categories}”> <CollectionViewSource.SortDescriptions> <scm:SortDescription PropertyName=”CategoryName” /> </CollectionViewSource.SortDescriptions> </CollectionViewSource> scm: xmlns:scm=”clr-namespace:System.ComponentModel;assembly=WindowsBase” see this – Filtering collections from XAML using CollectionViewSource Create and Expose an … Read more
It is possible. Use a ListCollectionView with a GroupDescription as the ItemsSource and just provide a GroupStyle to your ComboBox. See sample below: XAML: <Window x:Class=”StackOverflow.MainWindow” xmlns=”http://schemas.microsoft.com/winfx/2006/xaml/presentation” xmlns:x=”http://schemas.microsoft.com/winfx/2006/xaml” xmlns:local=”clr-namespace:StackOverflow” xmlns:uc=”clr-namespace:StackOverflow.UserControls” Title=”MainWindow” Height=”350″ Width=”525″> <StackPanel> <ComboBox x:Name=”comboBox”> <ComboBox.GroupStyle> <GroupStyle> <GroupStyle.HeaderTemplate> <DataTemplate> <TextBlock Text=”{Binding Name}”/> </DataTemplate> </GroupStyle.HeaderTemplate> </GroupStyle> </ComboBox.GroupStyle> <ComboBox.ItemTemplate> <DataTemplate> <TextBlock Text=”{Binding Name}”/> </DataTemplate> </ComboBox.ItemTemplate> </ComboBox> … Read more
You can do pretty much anything in XAML if you “try hard enough”, up to writing whole programs in it. You will never get around code behind (well, if you use libraries you don’t have to write any but the application still relies on it of course), here’s an example of what you can do … Read more