I'm trying to use Prism and HandyControl to create a project, but now I have a very strange problem.

This is My Github repo: https://github.com/sanshiliuxiao/PrismRegionWithHcTabControl

(If you know Chinese, you can see the principle of my implementation) My Blog: http://sanshiliuxiao.top/notebook/CSharp/20210611-PrismWithTabControl/

I have three views (A, B, Cwithparameters) whose ViewModel inherits Inavigationaware.

If I click the button (ViewA or ViewB), It can execute three functions in turn (OnNavigatedFrom、IsNavigationTarget、OnNavigatedTo).

But, if I click the button (ViewC), it just execute the OnNavigatedFrom.

Why? It's so strange!!!

Fix Inavigationaware problem

ISSUES: The Inavigationaware Interface Problem, Why Just exec OnNavigatedFrom

1. Create the IViewName interface

2. Modify function in Prism.Regions.RegionNavigationContentLoader.cs

      private IEnumerable<object> GetCandidatesFromRegionViews(IRegion region, string candidateNavigationContract)
       {
           return region.Views.Where(v => ViewIsMatch(v, candidateNavigationContract));
           // return region.Views.Where(v => ViewIsMatch(v.GetType(), candidateNavigationContract));
       }
   
       private bool ViewIsMatch(object v, string navigationSegment)
       {
   
           var names = new List<string>() { v.GetType().Name, v.GetType().FullName, (v as IViewName)?.ViewName ?? string.Empty, ((v as FrameworkElement)?.DataContext as IViewName)?.ViewName ?? string.Empty };
           return names.Any(x => x.Equals(navigationSegment, StringComparison.Ordinal));
       }
   
       //private static bool ViewIsMatch(Type viewType, string navigationSegment)
       //{
       //    var names = new[] { viewType.Name, viewType.FullName };
       //    return names.Any(x => x.Equals(navigationSegment, StringComparison.Ordinal));
       //}

3. View or ViewModel to inherits the interface.

4. When create a view, write the ViewName, like RegionWithHcTabControl.Helpers.TabSwitchOrAddHelper.cs:

       object content = System.Activator.CreateInstance(viewType);
   
       var v = ((content as FrameworkElement) as IViewName);
       if (v != null)
       {
           v.ViewName = viewName;
   
       }
       
       var vm = ((content as FrameworkElement)?.DataContext as IViewName);
       if (vm != null)
       {
           vm.ViewName = viewName;
       }