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POMVVM - Open Second View Windows 8
 

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    <p>Edit: Example App -> <a href="http://www10.zippyshare.com/v/29730402/file.html" rel="nofollow noreferrer">http://www10.zippyshare.com/v/29730402/file.html</a></p> <p>I'm programming an app for Windows 8 &amp; Windows Phone. I'm using the portable class library (see this article <a href="http://blog.tattoocoder.com/2013/01/portable-mvvm-light-move-your-view.html" rel="nofollow noreferrer">http://blog.tattoocoder.com/2013/01/portable-mvvm-light-move-your-view.html</a>).</p> <p>My problem is: How can I open a second window by clicking on a button by using the MVVM-pattern? I don't want to do it in the behind-code.</p> <p>My datacontext for the Windows 8 app looks in the xaml like this</p> <pre><code>DataContext="{Binding Main, Source={StaticResource Locator}}" </code></pre> <p>which uses the ViewModel of the PCL (= ViewModel for both, W8 &amp; WP8)</p> <pre><code>xmlns:vm="using:Mvvm.PCL.ViewModel" </code></pre> <p>I don't know how to assign 2 datacontext to my MainPage.xaml, nor do I know how to assign my MainPage.xaml to the ViewModel for my Windows 8 app.</p> <p>I've tried something like this:</p> <pre><code>Command="{Binding DisplayView}" CommandParameter="SecondView" </code></pre> <p>but the program uses the ViewModel for both platforms and I can't program there the windows-assignment for the specific platforms. (it should look something like this <a href="https://stackoverflow.com/questions/3100471/opening-multiple-views-by-clicking-button-using-mvvm-silverlight-approach">Opening multiple views by clicking button using MVVM silverlight approach</a> ...)</p> <p>To make it clear:</p> <p>I have 2 projects. Both MainWindows of the projects refer to the ViewModel of the "MainProject". If I want to click on a button in my MainWindow, I want to open a new view, but I can only use the ViewModel for both projects, which means that I can't use any views of the 2 projects in my ViewModel of the "MainProject".</p> <p>edit: I've seen that many people use ContentControl. (Still doesn't work. Btw im new to MVVM).</p> <pre><code>&lt;ContentControl Grid.Row="2" Content="{Binding CurrentView}" IsTabStop="False" Margin="10" /&gt; &lt;Button Command="{Binding DisplayView}" CommandParameter="SecondView"&gt; </code></pre> <p>MainViewModel.cs (For both platforms)</p> <pre><code>using System; using System.Collections.Generic; using System.ComponentModel; using System.Runtime.CompilerServices; using System.Windows.Input; using GalaSoft.MvvmLight; using GalaSoft.MvvmLight.Command; using Mvvm.PCL.Model; #if NETFX_CORE using Mvvm.Store.Views; using Windows.UI.Xaml; using Windows.UI.Xaml.Controls; #endif namespace Mvvm.PCL.ViewModel { public class MainViewModel : ViewModelBase, INotifyPropertyChanged { /// &lt;summary&gt; /// Initializes a new instance of the MainViewModel class. /// &lt;/summary&gt; public MainViewModel() { #if NETFX_CORE DisplayView = new RelayCommand&lt;string&gt;(DisplayViewCommandExecute); #endif } #region Commands public RelayCommand&lt;string&gt; DisplayView { get; private set; } #endregion #if NETFX_CORE #region CurrentView Property public const string CurrentViewPropertyName = "CurrentView"; private Page _currentView; public Page CurrentView { get { return _currentView; } set { if (_currentView == value) return; _currentView = value; RaisePropertyChanged(CurrentViewPropertyName); } } private SecondView _secondview = new SecondView(); public SecondView SecondView { get { return _secondview; } } #endregion private void DisplayViewCommandExecute(string viewName) { switch (viewName) { case "SecondView": CurrentView = _secondview; var frame = (Frame)Window.Current.Content; frame.Navigate(typeof(SecondView)); break; } } #endif } } </code></pre>
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    1. COYou shouldn't be afraid of doing things in the codebehind, you should just realize when to put code there. The MVVM pattern exists to separate data/biz logic from UI/view logic, so if what you're trying to accomplish only pertains to the view, you should use the codebehind. If you try to put *everything* in your ViewModel, you're going to end up having view-specific code in your ViewModel (which breaks the MVVM pattern), and your ViewModel is going to get very messy, very fast.
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    2. COMy buttons are in an AppBar. I'm using something like this now: <Button Click="GoToNextWindow" Command="{Binding DisplayView}" CommandParameter="SecondWindow"> private void GoToNextWindow(object sender, RoutedEventArgs e) { DataContext = new Mvvm.Store.ViewModel.MainViewModel(); } It's actually working, but only when I open the app bar, click on the button (all Bindings in my MainWindow are lost & the MainWindow is still open), close the app bar, open the app bar and click the button again.
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    3. COWhy do you have a Click handler and a Command handler? Usually it's one or the other, not both.
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