如何从CarouselPage导航到MasterDetailPage

Question

I have to navigate from CarouselPage to MasterDetailPage. I have created two different my first page is carousel page on click of any button in curousel page i should navigate to masterdeatilpage.

Please help me out how to write the code and my master page is different and detail page is differnet both is written in content page.

code:

app.cs

public static MasterDetailPage MasterDetailPage;
public App()
{
    var isLoggedIn = App.Current.Properties.ContainsKey("IsLoggedIn")? (bool)Properties["IsLoggedIn"] : false;
        // The root page of your application
        if (isLoggedIn)
        {
            MasterDetailPage = new Xamarin.Forms.MasterDetailPage
            {
                Master = new Menu(),
                Detail = new NavigationPage(new detail())
                {
                    Tint = Color.FromHex("313FA0")
                }
            };

            MasterDetailPage.MasterBehavior = MasterBehavior.Popover;

            MainPage = MasterDetailPage;
        }
        else
        {
           MainPage = new NavigationPage(new carousel());
        }
}

carousel.xaml.cs

<CarouselPage>
 <ContentPage>
   <StackLayout>
     <Button Text="click" Clicked="funca()"/>
   </StackLayout>
  </ContentPage>
</CarouselPage>

carousel.cs

void funca(object sender, EventArgs e){
    App.MasterDetailPage.Master = new Menu();
    App.MasterDetailPage.Detail = new NavigationPage(new detail());
    App.MasterDetailPage.IsPresented = false;  
}

In Click of the button it is shown error

System.Exception: Object reference not set to an instance of an object

Please help me out

Answer 1

Please have a look at my sample repo here . I am using there solution based on MessagingCenter I believe it should also work in your scenario. Remember to put something similar to this in your MasterDetailPage .

Answer 2

I found the answer of the given question with help of @Tomasz Kowalczyk thanks dude

I created one class MasterPage.cs

public class MasterPage : MasterDetailPage
{
    public MasterPage()
    {
        Master = new Menu();
        Detail = new NavigationPage(new detail());
    }
}

app.cs

public App()
{
  var isLoggedIn = App.Current.Properties.ContainsKey("IsLoggedIn")? (bool)Properties["IsLoggedIn"] : false;
    // The root page of your application
    if (isLoggedIn)
    {
        MainPage = new MasterPage();
    }
    else
    {
       MainPage = new NavigationPage(new carousel());
    }
}

carousel.cs

void funca(object sender, EventArgs e){
   MasterPage mp = new Menu();
   mp.Detail = new NavigationPage(new Detail());
   App.Current.MainPage = mp;
}