Bug? System.ArgumentException: ‘unable to figure out route for:

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Issue

Error

System.ArgumentException: ‘unable to figure out route for: //RegisterPage Parameter name: uri’ System.ArgumentException: ‘unable to figure out route for: //LogoPage Parameter name: uri’

What is wrong? It cant figure out the route…?

XAML

<?xml version"1.0" encoding"utf-8" ?>
<ContentPage xmlns"http://xamarin.com/schemas/2014/forms"
             xmlns:x"http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:d"http://xamarin.com/schemas/2014/forms/design"
             xmlns:mc"http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable"d"
             x:Class"MyApp.Views.WelcomePage"
             Shell.NavBarIsVisible"False">
    <ContentPage.Content>
        <StackLayout Padding"10,0,10,0" VerticalOptions"Center">
            <Button VerticalOptions"Center" Text"Register" Command"{Binding RegisterCommand}"/>
            <Button VerticalOptions"Center" Text"Login" Command"{Binding LoginCommand}"/>
        </StackLayout>
    </ContentPage.Content>
</ContentPage>

Code behind

[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class WelcomePage : ContentPage
{
    public WelcomePage()
    {
        InitializeComponent();
        this.BindingContext  new WelcomeViewModel();
    }
}

WelcomeViewModel.cs

public Command RegisterCommand { get; }
public Command LoginCommand { get; }

public WelcomeViewModel()
{
    RegisterCommand  new Command(OnRegisterClicked);
    LoginCommand  new Command(OnLoginClicked);
}

private async void OnRegisterClicked(object obj)
{
    await Shell.Current.GoToAsync($"//{nameof(RegisterPage)}");
}

private async void OnLoginClicked(object obj)
{
    await Shell.Current.GoToAsync($"//{nameof(LoginPage)}");
}

Solution

Your need to register a route for each page you are willing to navigate into it using Shell.Current.GoToAsync(), with this way you can also clarify your pages hierarchy:

    <FlyoutItem FlyoutDisplayOptions"AsMultipleItems">

        <ShellContent Title"RegisterPage"
                      Route"RegisterPage"
                      ContentTemplate"{DataTemplate local:RegisterPage}"/>

        <ShellContent Title"LoginPage"
                      Route"LoginPage"
                      ContentTemplate"{DataTemplate local:LoginPage}"/>

        <ShellContent Title"Page3"
                      ContentTemplate"{DataTemplate local:Page3}"/>

    </FlyoutItem>

You can also register the route using Routing.RegisterRoute() in the code if you prefer, as long as it runs before a route is invoked: Routing.RegisterRoute("//Page3", typeof(Page3));

Microsoft Documentation

For more details: Shell Navigation

Answered By – Cfun

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