The first time for MVVM and I got a problem. I need help.

Question

App.cs
#if DEBUG
if (System.Diagnostics.Debugger.IsAttached)
this.DebugSettings.EnableFrameRateCounter = true;
#endif
Frame rootFrame = Window.Current.Content as Frame;
// Do not repeat app initialization when the Window already has content,
// just ensure that the window is active
if (rootFrame == null)
// Create a Frame to act as the navigation context and navigate to the first page
rootFrame = new Frame();
var viewModel = new MainWindowModel();
MainPage main = new MainPage();
main.DataContext = viewModel;
// TODO: change this value to a cache size that is appropriate for your application
rootFrame.CacheSize = 1;
if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
// TODO: Load state from previously suspended application
// Place the frame in the current Window
Window.Current.Content = rootFrame;
DataAccess.cs
readonly List<Menu> _menu;
public MenuRespository()
if(_menu==null)
_menu = new List<Menu>();
_menu.Add(Menu.CreateMenu("/Photos/Gas-50.png", "t"));
_menu.Add(Menu.CreateMenu("/Photos/Gas-50.png", "t"));
_menu.Add(Menu.CreateMenu("/Photos/Gas-50.png", "t"));
_menu.Add(Menu.CreateMenu("/Photos/Gas-50.png", "t"));
_menu.Add(Menu.CreateMenu("/Photos/Gas-50.png", "t"));
_menu.Add(Menu.CreateMenu("/Photos/Gas-50.png", "t"));
_menu.Add(Menu.CreateMenu("/Photos/Gas-50.png", "t"));
public List<Menu> GetMenu()
return new List<Menu>(_menu);
Menu.cs
public class Menu
public static Menu CreateMenu(string iconthumb, string text)
return new Menu { IconThumb = iconthumb, Text = text };
public string IconThumb { get; set; }
public string Text { get; set; }
MainWindowsModel
public class MainWindowModel :ViewModelBase
readonly MenuRespository _menuRepository;
ObservableCollection<ViewModelBase> _viewModels;
public MainWindowModel()
_menuRepository = new MenuRespository();
//create an instance of our viewmodel add it to our collection
MenuListViewModel viewModel = new MenuListViewModel(_menuRepository);
this.ViewModels.Add(viewModel);
public ObservableCollection<ViewModelBase> ViewModels
get
if(_viewModels==null)
_viewModels = new ObservableCollection<ViewModelBase>();
return _viewModels;
ViewBase
public abstract class ViewModelBase :INotifyPropertyChanged, IDisposable
protected ViewModelBase()
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
PropertyChangedEventHandler hander = this.PropertyChanged;
if(hander!=null)
var e = new PropertyChangedEventArgs(propertyName);
hander(this, e);
public void Dispose()
this.Dispose();
protected virtual void OnDispose()
class MenuListViewModel :ViewModelBase
readonly MenuRespository _menuRepository;
public ObservableCollection<Model.Menu> AllMenu
get;
private set;
public MenuListViewModel(MenuRespository menuRepository)
if(menuRepository==null)
throw new ArgumentException("menuRepository");
_menuRepository = menuRepository;
this.AllMenu = new ObservableCollection<Model.Menu>(_menuRepository.GetMenu());
protected override void OnDispose()
//base.OnDispose();
this.AllMenu.Clear();
MenuListBox.xaml into View(show off "
<UserControl
x:Class="MixNokia.View.MenuListBox"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:MixNokia.View"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<StackPanel>
<ListBox ItemsSource="{Binding AllMenu}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Image Source="{Binding IconThumb}" Width="40" Height="40" VerticalAlignment="Center" HorizontalAlignment="Left"></Image>
<TextBlock Text="{Binding Text}" FontSize="15" Foreground="#CCCCCC" VerticalAlignment="Center" HorizontalAlignment="Center"></TextBlock>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</StackPanel>
</UserControl>
The final
<Page
x:Class="MixNokia.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:MixNokia"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:vm="using:MixNokia.ViewModel"
xmlns:v="using:MixNokia.View"
mc:Ignorable="d">
<Page.DataContext>
<vm:MainWindowModel />
</Page.DataContext>
Mainpages.
<ListBox x:Name="lstMainMenu" SelectionChanged="lstMainMenu_SelectionChanged" Background="Transparent" ItemsSource="{Binding ViewModels}">
I'm developing on universal..
It was showing "mixnokia.viewmodel.menulistviewmodel "

Answer 1

Greg - please tell us exactly what is wrong when you make a post.
Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.
NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined
objects and unknown namespaces.