ADD : Use Command for OnSelectionChanged in TousView

LivreLand/View/TousView.xaml

@@ -39,7 +39,8 @@
                 <CollectionView ItemsSource="{Binding TousVM.Manager.AllBooks}"
                                 SelectedItem="{Binding TousVM.Manager.SelectedBook}"
                                 SelectionMode="Single"
-                                SelectionChanged="OnSelectionChanged"
+                                SelectionChangedCommand="{Binding TousVM.OnSelectionChangedCommand}"
+                                SelectionChangedCommandParameter="{Binding TousVM.Manager.SelectedBook}"
                                 Grid.Row="2">
                     <CollectionView.GroupHeaderTemplate>
                         <DataTemplate x:DataType="viewModel:BookVM">

LivreLand/View/TousView.xaml.cs

@@ -26,14 +26,5 @@ public partial class TousView : ContentPage
 
     #region Methods
 
-    void OnSelectionChanged(object sender, SelectionChangedEventArgs e)
-	{
-        if (e.CurrentSelection.FirstOrDefault() is BookVM)
-        {
-            var result = new DetailsLivreVM(TousVM.Manager, TousVM.Navigator, e.CurrentSelection.FirstOrDefault() as BookVM);
-            App.Current.MainPage.Navigation.PushAsync(new DetailsLivreView(result));
-        }
-	}
-
     #endregion
 }

LivreLand/ViewModel/TousVM.cs

@@ -1,9 +1,11 @@
-using PersonalMVVMToolkit;
+using LivreLand.View;
+using PersonalMVVMToolkit;
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using System.Windows.Input;
 using ViewModels;
 
 namespace LivreLand.ViewModel
@@ -16,6 +18,7 @@ namespace LivreLand.ViewModel
 
         public ManagerVM Manager { get; private set; }
 
+        public ICommand OnSelectionChangedCommand { get; private set; }
         #endregion
 
         #region Constructor
@@ -24,6 +27,17 @@ namespace LivreLand.ViewModel
         {
             Navigator = navigatorVM;
             Manager = managerVM;
+            OnSelectionChangedCommand = new RelayCommand<BookVM>((bookVM) => OnSelectionChanged(bookVM));
+        }
+
+        #endregion
+
+        #region Methods
+
+        private void OnSelectionChanged(BookVM bookVM)
+        {
+            var result = new DetailsLivreVM(Manager, Navigator, bookVM);
+            App.Current.MainPage.Navigation.PushAsync(new DetailsLivreView(result));
         }
 
         #endregion

ViewModels/ManagerVM.cs

@@ -27,6 +27,7 @@ namespace ViewModels
         private int index;
         private long nbBooks;
 
+        private BookVM selectedBook;
         private AuthorVM selectedAuthor;
         private PublishDateVM selectedDate;
         private RatingsVM selectedRating;
@@ -99,7 +100,18 @@ namespace ViewModels
             get => status;
         }
 
-        public BookVM SelectedBook { get; set; }
+        public BookVM SelectedBook
+        {
+            get { return selectedBook; }
+            set
+            {
+                if (selectedBook != value)
+                {
+                    selectedBook = value;
+                    OnPropertyChanged(nameof(SelectedBook));
+                }
+            }
+        }
 
         public AuthorVM SelectedAuthor
         {