Styjun

I am using autofac for dependency injection and I need to override the navigation function. in order to do that I did

Locator.cs(where contain the Cs files)

 private readonly ContainerBuilder _builder;

 public locator()
 
 _builder = new ContainerBuilder();
 register();
 Container = _builder.Build();
 

 public IContainer Container get; set; 

 private void register()
 
 _builder.RegisterType<vm>().As<Ivm>();
 _builder.RegisterType<Vm1>();
 _builder.RegisterType < basevm>();

 _builder.RegisterType<MainPage>();
 _builder.RegisterType<xa>();
 

In my app.Xaml.cs

In constructor

 public App()
 
 InitializeComponent();
 locator locator1 = new locator();
 Container = locator1.Container;

 MainPage = new NavigationPage(Container.Resolve<MainPage>());
 
 public static IContainer Container;

then I tried to override the navigation func in my main page code behind it cannot be override. what I am missing and where i use this

 public abstract void Navigate(SelectedItemChangedEventArgs e);

 public override async void Navigate(SelectedItemChangedEventArgs e)
 
 xa patientListViewPage = App.Container.Resolve<xa>();

 await Navigation.PushAsync(patientListViewPage);
 

why this is not working. I occur this error

'MainPage.Navigate(SelectedItemChangedEventArgs)': no suitable method found to override

You can derive from NavigationPage reference.

public class CustomNavigationPage : NavigationPage

 //You can define your container here.
 public CustomNavigationPage()
 
 //You can resolve here 
 

and also you can look
here

I Can think of a better way You are using Autofac so you can have a generic method that can help the cause.

 public static async Task NavigateAsync<TContentPage>(INavigation navigation ) where TContentPage : ContentPage
 
 var contentPage = App.Container.Resolve<TContentPage>(); 

 await navigation.PushAsync(contentPage, true);
 

Also If you need to pass a parameter You can modify it like this

 public static async Task NavigateAsync<TContentPage, TNavigationParameter>(INavigation navigation,
 TNavigationParameter navParam,
 Action<TContentPage, TNavigationParameter> action = null) where TContentPage : ContentPage
 
 var contentPage = App.Container.Resolve<TContentPage>(); 
 action?.Invoke(contentPage, navParam); 
 await navigation.PushAsync(contentPage, true);