Check if the ContentPage is a MainPage

Question

Check if the ContentPage is a MainPage

Jassim Al Rahma 1,616

Hi,

In .NET MAUI, how can I check the current page is a Mainpage?

Thanks,

Jassim

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Answer 1

Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,126 Microsoft External Staff

Hello,

You could set a Title on your page and use it to determine if the current page is MainPage:

// in xaml
<ContentPage ...
             x:Class="MauiApp14.NewPage1"
             Title="NewPage1">
// in c#
var name = AppShell.Current.CurrentPage.Title;
if (name.Equals("MainPage"))
{
	Console.WriteLine("MainPage");
}else
{
	Console.WriteLine(name);
}

Update:

This problem occurs because you put var name = AppShell.Current.CurrentPage.ClassId; is placed in the page's constructor, and the CurrentPage has not yet been assigned, so this error is caused.

For any way to get page properties, a more recommended way is to put them in the page's OnAppearing method.

protected override void OnAppearing()
    {
        base.OnAppearing();
        var name = AppShell.Current.CurrentPage.ClassId;
        if ...
    }

Best Regards,

Alec Liu.

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Jassim Al Rahma 1,616

I tried the below:

public MyProfile()
{
	InitializeComponent();

    var name = AppShell.Current.CurrentPage.ClassId;

    if (name.Equals("MyProfile"))
    {
        ImageClose.IsVisible = false;
    }
    else
    {
        Console.WriteLine(name);
    }

    LabelFirstName.Text = SecureStorage.GetAsync("OneIdFirstName").Result;
    LabelLastName.Text = SecureStorage.GetAsync("OneIdLastName").Result;
}

but got this error:

On this line:

System.NullReferenceException: Object reference not set to an instance of an object.
  at MyApp.Mobile.MyProfile..ctor() in /Users/jassim/Projects/MyApp/MyApp/Mobile/MyProfile.xaml.cs:21
  at MyApp.Mobile.Signin.ButtonSignin_Clicked(Object sender, EventArgs e) in /Users/jassim/Projects/MyApp/MyApp/Mobile/Signin.xaml.cs:174
  at at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__128_0(Object state)
  at at Foundation.NSAsyncSynchronizationContextDispatcher.Apply()
  at at UIKit.UIApplication.UIApplicationMain(Int32 argc, String[] argv, IntPtr principalClassName, IntPtr delegateClassName)
  at at UIKit.UIApplication.Main(String[] args, Type principalClass, Type delegateClass)
  at MyApp.Program.Main(String[] args) in /Users/jassim/Projects/MyApp/MyApp/Platforms/iOS/Program.cs:13

On this line:

var name = AppShell.Current.CurrentPage.ClassId;

this is my XAML:

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    Shell.NavBarIsVisible="False"
    x:Class="MyApp.Mobile.MyProfile"
    ClassId="MyProfile">

Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,126 Reputation points Microsoft External Staff

2023-03-31T01:18:38.5466667+00:00

I've updated my answer, could you please check it?

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Check if the ContentPage is a MainPage

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