WPF PRISM: IRegionMemberLifetime KeepAlive doesn't get called

WPF PRISM: IRegionMemberLifetime KeepAlive doesn't get called

I have a need to switch the view being displayed based on a certain condition. I have implemented the switching logic in the constructor of the ViewModel

I am implementing IRegionMemberLifetime on the View and setting KeepAlive to false so that I always get a new instance of the View and the ViewModel.

But for some reason, when I click on the Navigation Button, my breakpoint at KeepAlive never reaches and I get the MainView instead of the WelcomeView.

Could you please help me out?

Here is the code for your reference:

Navigation Button:

<Controls:SignedButton VerticalAlignment="Top" Width="275" Height="45"     Foreground="#FFFFFF"      LeftSign="&lt;" Text="Back to Accounts"      TextSize="20" ButtonBackground="#666666"      HoverBackground="#0FBDAC" HoverOpacity="1" Margin="0,25,0,0"     Command="{x:Static Infrastructure:ApplicationCommands.NavigateCommand}"     CommandParameter="{x:Type Views:MainView}"/> 

View Model:

public class MainViewModel : ViewModel, IMainViewModel {     private readonly IUnityContainer _container;      public MainViewModel(IMainView view, IUnityContainer container) : base(view)     {         _container = container;         Accounts = new List<Account>();          View.ViewModel = this;          if (Accounts.Any()) return;          IView welcomeView = _container.Resolve<IWelcomeViewModel>().View;         welcomeView.ViewModel = this;          UpdateView(welcomeView);     }      public IList<Account> Accounts { get; private set; } } 

View Model Base:

public abstract class ViewModel : IViewModel {     protected ViewModel(IView view)     {         View = view;     }      protected virtual void OnPropertyChanged(string propertyName)     {         PropertyChangedEventHandler handler = PropertyChanged;         if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));     }      protected void UpdateView(IView view)     {         View = view;     }      public event PropertyChangedEventHandler PropertyChanged;      public IView View { get; private set; } } 

View:

public partial class MainView : UserControl, IMainView, IRegionMemberLifetime {     public MainView()     {         InitializeComponent();     }      public IViewModel ViewModel     {         get { return (IMainViewModel) DataContext; }         set { DataContext = value; }     }      public bool KeepAlive     {         get { return false; }     } } 

Shell View Model:

public class ShellViewModel : ViewModel, IShellViewModel {     private readonly IRegionManager _regionManager;      public ShellViewModel(IShellView view, IRegionManager regionManager) : base(view)     {         _regionManager = regionManager;          NavigateCommand = new DelegateCommand<object>(Navigate);         ApplicationCommands.NavigateCommand.RegisterCommand(NavigateCommand);     }      private void Navigate(object navigatePath)     {         if (navigatePath != null)         {             _regionManager.RequestNavigate(Regions.Main, navigatePath.ToString());         }     }      public DelegateCommand<object> NavigateCommand { get; private set; } } 

Thanks a lot for looking into this :)

Answers & Comments...

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