Articles

EnhancedObservableCollection

This is an enhancement of the ObservableCollecton. It brings additional behaviors like the AddRange, RemoveAll, Sort and you also can get a command if one of the inner elements sends the property changed.

Usage

<UserControl x:Class="DW.SharpTools.Demo.EnhancedObservableCollectionControl"
			 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
			 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
			 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
			 xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
			 mc:Ignorable="d" 
			 d:DesignHeight="300" d:DesignWidth="300">
	<DockPanel>
		<StackPanel Orientation="Horizontal" DockPanel.Dock="Bottom" HorizontalAlignment="Center">
			<Button Content="Add Alphabet" Click="AddAlphabet_Click" />
			<Button Content="Sort" Click="Sort_Click" />
			<Button Content="Revert" Click="Revert_Click" />
		</StackPanel>
		<ListBox ItemsSource="{Binding Items}">
			<ListBox.ItemsPanel>
				<ItemsPanelTemplate>
					<WrapPanel />
				</ItemsPanelTemplate>
			</ListBox.ItemsPanel>
		</ListBox>
	</DockPanel>
</UserControl>

using System.Linq;
using System.Windows;
using System.Windows.Controls;

namespace DW.SharpTools.Demo
{
	public partial class EnhancedObservableCollectionControl : UserControl
	{
		public EnhancedObservableCollectionControl()
		{
			InitializeComponent();
			DataContext = this;

			Items = new EnhancedObservableCollection<char>();
		}

		public EnhancedObservableCollection<char> Items { get; set; }

		private void AddAlphabet_Click(object sender, System.Windows.RoutedEventArgs e)
		{
			Items.AddRange(Enumerable.Range('a', 26).Select(i => (char)i));
		}

		private void Sort_Click(object sender, RoutedEventArgs e)
		{
			Items.Sort();
		}

		private void Revert_Click(object sender, RoutedEventArgs e)
		{
			Items.Sort(Revert);
		}

		private static int Revert(char lhv, char rhv)
		{
			return rhv.CompareTo(lhv);
		}
	}
}