Xamarin.Forms FlyoutPage is not working with Prism - xamarin

Question

Please help me out. In order for you to understand my problem, I have replicated the scenario in sample application
As Xamarin.Forms introduced FlyoutPage page in 5.0 version, navigation is not working in one of the applications.
I am opening main page from app.xaml.cs like this await NavigationService.NavigateAsync("Page3");
FlyoutPage:
<FlyoutPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:views="clr-namespace:PrismNavigation.Views;assembly=PrismNavigation"
xmlns:prism="http://prismlibrary.com"
prism:ViewModelLocator.AutowireViewModel="True"
x:Class="PrismNavigation.Views.Page3"
Title="Master">
<FlyoutPage.Flyout>
<ContentPage Title="Menu">
<StackLayout>
<Button Text="Page2" HeightRequest="50" WidthRequest="100" Command="{Binding NavigateCommand}" CommandParameter="Page2"></Button>
</StackLayout>
</ContentPage>
</FlyoutPage.Flyout>
<FlyoutPage.Detail>
<NavigationPage>
<x:Arguments>
<views:Page1></views:Page1>
</x:Arguments>
</NavigationPage>
</FlyoutPage.Detail>
</FlyoutPage>
Page3ViewModel:
using Prism.Commands;
using Prism.Mvvm;
using Prism.Navigation;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace PrismNavigation.ViewModels
{
public class Page3ViewModel : ViewModelBase
{
private readonly INavigationService navigationService;
public Page3ViewModel(
INavigationService navigationService)
: base(navigationService)
{
this.navigationService = navigationService;
this.NavigateCommand = new DelegateCommand<string>(this.NavigateCommandExecute);
}
public override void OnNavigatedTo(INavigationParameters parameters)
{
base.OnNavigatedTo(parameters);
}
private void NavigateCommandExecute(string obj)
{
this.navigationService.NavigateAsync($"NavigationPage/{obj}");
}
public DelegateCommand<string> NavigateCommand { get; set; }
}
}
App:
using Prism;
using Prism.Ioc;
using PrismNavigation.ViewModels;
using PrismNavigation.Views;
using Xamarin.Essentials.Implementation;
using Xamarin.Essentials.Interfaces;
using Xamarin.Forms;
namespace PrismNavigation
{
public partial class App
{
public App(IPlatformInitializer initializer)
: base(initializer)
{
}
protected override async void OnInitialized()
{
InitializeComponent();
await NavigationService.NavigateAsync("Page3");
}
protected override void RegisterTypes(IContainerRegistry containerRegistry)
{
containerRegistry.RegisterSingleton<IAppInfo, AppInfoImplementation>();
containerRegistry.RegisterForNavigation<NavigationPage>();
containerRegistry.RegisterForNavigation<Page1>();
containerRegistry.RegisterForNavigation<Page2>();
containerRegistry.RegisterForNavigation<Page3, Page3ViewModel>();
}
}
}
When I am trying to navigate to Page2 from menu, i can not do that. When I click the button, navigate command is executed, but navigation is not happening.

Answer 1

Update:
In addition to my old answer, which you have fixed in the question, it seems that the FlyoutPage is not supported by Prism 8 according to this. It is planned for 8.1. So, you can either wait 8.1 or replace it with MasterDetailPage. I tried your example with MasterDetailPage and it worked fine for me:
<?xml version="1.0" encoding="utf-8" ?>
<MasterDetailPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:prism="http://prismlibrary.com"
prism:ViewModelLocator.AutowireViewModel="True"
x:Class="PrismNavigation.Views.Page3">
<MasterDetailPage.Master>
<ContentPage Title="Menu">
<StackLayout Padding="20">
<Button Text="Page2" HeightRequest="50" WidthRequest="100" Command="{Binding NavigateCommand}" CommandParameter="Page2"></Button>
</StackLayout>
</ContentPage>
</MasterDetailPage.Master>
<MasterDetailPage.Detail>
<NavigationPage>
<x:Arguments>
<ContentPage Title="This is Page1"></ContentPage>
</x:Arguments>
</NavigationPage>
</MasterDetailPage.Detail>
</MasterDetailPage>
Old answer:
Seems like you didn't pass any parameter to your NavigateCommand. Try this
<StackLayout>
<Button Text="Page2" HeightRequest="50" WidthRequest="100" Command="{Binding NavigateCommand}" CommandParameter="Page2"></Button>
</StackLayout>