Making the ListExtensions feature in-line with the documentation

Microsoft.Toolkit.Uwp.SampleApp/SamplePages/ListViewExtensions/ListViewExtensionsCode.bind

@@ -22,6 +22,8 @@
         x:Name="SampleListView"
         Margin="12"
         ItemTemplate="{StaticResource NormalTemplate}"
+        IsItemClickEnabled="True"
+        extensions:ListViewExtensions.Command="{Binding SampleCommand}"
         extensions:ListViewExtensions.AlternateColor="#33AAAAAA"
         extensions:ListViewExtensions.AlternateItemTemplate="{StaticResource AlternateTemplate}"
         extensions:ListViewExtensions.StretchItemContainerDirection="Both">

Microsoft.Toolkit.Uwp.SampleApp/SamplePages/ListViewExtensions/ListViewExtensionsPage.xaml

@@ -1,31 +1,32 @@
-<Page
-    x:Class="Microsoft.Toolkit.Uwp.SampleApp.SamplePages.ListViewExtensionsPage"
-    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
-    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-    xmlns:extensions="using:Microsoft.Toolkit.Uwp.UI.Extensions"
-    mc:Ignorable="d">
+<Page x:Class="Microsoft.Toolkit.Uwp.SampleApp.SamplePages.ListViewExtensionsPage"
+      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+      xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+      xmlns:extensions="using:Microsoft.Toolkit.Uwp.UI.Extensions"
+      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+      mc:Ignorable="d">
 
     <Page.Resources>
         <DataTemplate x:Name="NormalTemplate">
-            <TextBlock Text="{Binding Title}" Foreground="Green"></TextBlock>
+            <TextBlock Foreground="Green"
+                       Text="{Binding Title}" />
         </DataTemplate>
 
         <DataTemplate x:Name="AlternateTemplate">
-            <TextBlock Text="{Binding Title}" Foreground="Red"></TextBlock>
+            <TextBlock Foreground="Red"
+                       Text="{Binding Title}" />
         </DataTemplate>
     </Page.Resources>
 
     <Grid>
 
-        <ListView 
-            x:Name="SampleListView"
-            Margin="12"
-            ItemTemplate="{StaticResource NormalTemplate}"
-            extensions:ListViewExtensions.AlternateColor="#33AAAAAA"
-            extensions:ListViewExtensions.AlternateItemTemplate="{StaticResource AlternateTemplate}"
-            extensions:ListViewExtensions.StretchItemContainerDirection="Both">
-        </ListView>
+        <ListView x:Name="SampleListView"
+                  Margin="12"
+                  extensions:ListViewExtensions.AlternateColor="#33AAAAAA"
+                  extensions:ListViewExtensions.AlternateItemTemplate="{StaticResource AlternateTemplate}"
+                  extensions:ListViewExtensions.Command="{Binding SampleCommand}"
+                  extensions:ListViewExtensions.StretchItemContainerDirection="Both"
+                  IsItemClickEnabled="True"
+                  ItemTemplate="{StaticResource NormalTemplate}" />
     </Grid>
 </Page>

Microsoft.Toolkit.Uwp.SampleApp/SamplePages/ListViewExtensions/ListViewExtensionsPage.xaml.cs

@@ -2,7 +2,12 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+using System;
+using System.Windows.Input;
+using Microsoft.Toolkit.Uwp.SampleApp.Common;
+using Microsoft.Toolkit.Uwp.SampleApp.Data;
 using Microsoft.Toolkit.Uwp.UI.Extensions;
+using Windows.UI.Popups;
 using Windows.UI.Xaml;
 using Windows.UI.Xaml.Controls;
 
@@ -15,6 +20,8 @@ public ListViewExtensionsPage()
             this.InitializeComponent();
         }
 
+        public ICommand SampleCommand => new DelegateCommand<PhotoDataItem>(OnExecuteSampleCommand);
+
         public async void OnXamlRendered(FrameworkElement control)
         {
             var sampleListView = control.FindChildByName("SampleListView") as ListView;
@@ -23,6 +30,14 @@ public async void OnXamlRendered(FrameworkElement control)
             {
                 sampleListView.ItemsSource = await new Data.PhotosDataSource().GetItemsAsync();
             }
+
+            // Transfer Data Context so we can access SampleCommand
+            control.DataContext = this;
+        }
+
+        private async void OnExecuteSampleCommand(PhotoDataItem item)
+        {
+            await new MessageDialog($"You clicked {item.Title} via the 'ListViewExtensions.Command' binding", "Item Clicked").ShowAsync();
         }
     }
 }

Microsoft.Toolkit.Uwp.UI/Extensions/ListViewBase/ListViewExtensions.Command.cs

@@ -0,0 +1,78 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Windows.Input;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+
+namespace Microsoft.Toolkit.Uwp.UI.Extensions
+{
+    /// <summary>
+    /// Provides the Command attached dependency property for the <see cref="Windows.UI.Xaml.Controls.ListViewBase"/>
+    /// </summary>
+    public static partial class ListViewExtensions
+    {
+        /// <summary>
+        /// Attached <see cref="DependencyProperty"/> for binding an <see cref="System.Windows.Input.ICommand"/> to handle ListViewBase Item interaction by means of <see cref="Windows.UI.Xaml.Controls.ListViewBase"/> ItemClick event. ListViewBase IsItemClickEnabled must be set to true.
+        /// </summary>
+        public static readonly DependencyProperty CommandProperty = DependencyProperty.RegisterAttached("Command", typeof(ICommand), typeof(ListViewExtensions), new PropertyMetadata(null, OnCommandPropertyChanged));
+
+        /// <summary>
+        /// Gets the <see cref="ICommand"/> associated with the specified <see cref="ListViewBase"/>
+        /// </summary>
+        /// <param name="obj">The <see cref="Windows.UI.Xaml.Controls.ListViewBase"/> to get the associated <see cref="ICommand"/> from</param>
+        /// <returns>The <see cref="ICommand"/> associated with the <see cref="ListViewBase"/></returns>
+        public static ICommand GetCommand(ListViewBase obj)
+        {
+            return (ICommand)obj.GetValue(CommandProperty);
+        }
+
+        /// <summary>
+        /// Sets the <see cref="ICommand"/> associated with the specified <see cref="ListViewBase"/>
+        /// </summary>
+        /// <param name="obj">The <see cref="Windows.UI.Xaml.Controls.ListViewBase"/> to associate the <see cref="ICommand"/> with</param>
+        /// <param name="value">The <see cref="ICommand"/> for binding to the <see cref="ListViewBase"/></param>
+        public static void SetCommand(ListViewBase obj, ICommand value)
+        {
+            obj.SetValue(CommandProperty, value);
+        }
+
+        private static void OnCommandPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
+        {
+            var listViewBase = sender as ListViewBase;
+
+            if (listViewBase == null)
+            {
+                return;
+            }
+
+            var oldCommand = args.OldValue as ICommand;
+            if (oldCommand != null)
+            {
+                listViewBase.ItemClick -= OnListViewBaseItemClick;
+            }
+
+            var newCommand = args.NewValue as ICommand;
+            if (newCommand != null)
+            {
+                listViewBase.ItemClick += OnListViewBaseItemClick;
+            }
+        }
+
+        private static void OnListViewBaseItemClick(object sender, ItemClickEventArgs e)
+        {
+            var listViewBase = sender as ListViewBase;
+            var command = GetCommand(listViewBase);
+            if (listViewBase == null || command == null)
+            {
+                return;
+            }
+
+            if (command.CanExecute(e.ClickedItem))
+            {
+                command.Execute(e.ClickedItem);
+            }
+        }
+    }
+}

Microsoft.Toolkit.Uwp.UI/Extensions/ListViewBase/ListViewExtensions.cs

@@ -118,7 +118,6 @@ private static void OnAlternateColorPropertyChanged(DependencyObject sender, Dep
         private static void ColorContainerContentChanging(Windows.UI.Xaml.Controls.ListViewBase sender, ContainerContentChangingEventArgs args)
         {
             var itemContainer = args.ItemContainer as Control;
-
             SetItemContainerBackground(sender, itemContainer, args.ItemIndex);
         }