Getting WinRT Errors when using WebView2 in WinAppSdk 1.0.0 application

[sharpninja]

Exception thrown at 0x00007FF9EAF3478C (KernelBase.dll) in ChromeMusicLab.exe: WinRT originate error - 0x80010106 : 'Cannot change thread mode after it is set.'.

onecore\com\combase\winrt\error\restrictederror.cpp(1017)\combase.dll!00007FF9ED2EA21E: (caller: 00007FF9ED1DA2F3) ReturnHr(3) tid(1c8c) 8007007E The specified module could not be found.
Exception thrown at 0x00007FF9EAF3478C in ChromeMusicLab.exe: Microsoft C++ exception: winrt::hresult_error at memory location 0x000000E29F778D10.
Exception thrown at 0x00007FF9EAF3478C in ChromeMusicLab.exe: Microsoft C++ exception: winrt::hresult_error at memory location 0x000000E29F7768E0.
Exception thrown at 0x00007FF9EAF3478C in ChromeMusicLab.exe: Microsoft C++ exception: winrt::hresult_error at memory location 0x000000E29F778DB0.
Exception thrown at 0x00007FF9EAF3478C in ChromeMusicLab.exe: Microsoft C++ exception: [rethrow] at memory location 0x0000000000000000.

 Msg:[winrt::hresult_error: Cannot change thread mode after it is set.] 
Exception thrown at 0x00007FF9EAF3478C in ChromeMusicLab.exe: Microsoft C++ exception: winrt::hresult_error at memory location 0x000000E29F778F60.

I'm not sure if the problem is me or a bug in WebView2. I am not starting the app via the canonical method. I am using the Microsoft.Extensions.Hosting model via this project: https://github.com/sharpninja/WindowsAppSdkHost

Program.cs looks like this:

namespace ChromeMusicLab;
using Views;
public static class Program
{
    //[STAThread]
    public static Task Main(string[] args)
    {
        WindowsAppSdkHostBuilder<App> builder = new();

        builder.ConfigureServices(
            (_, collection)
                => collection
                    .AddSingleton<MainWindow>()
                    .AddSingleton<MainPage>()
                    .AddSingleton<NavigationView>()
                    .AddSingleton<NavigationViewModel>()
        );

        AppHost = builder.Build();

        return AppHost.StartAsync();
    }

    public static IHost? AppHost { get; private set; }
}

As you can see, the UI is mostly served from the DI container.

public partial class App
{
    public App()
    {
        this.InitializeComponent();
    }

    protected override void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
    {
        _window = Program.AppHost.Services.GetRequiredService<MainWindow>();
        _window.Activate();
    }

    private Window _window;
}

public sealed partial class MainWindow
{
    public MainWindow(MainPage page)
    {
        this.InitializeComponent();

        Content = page;
    }
}

<Page x:Class="ChromeMusicLab.Views.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:ChromeMusicLab.Views"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"
        Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

    <TwoPaneView x:Name="Panes">
        <TwoPaneView.Pane2>
            <local:WebViewWrapper x:Name="WebWrapper" />
        </TwoPaneView.Pane2>
    </TwoPaneView>
</Page>

public sealed partial class MainPage
{
    // ReSharper disable once SuggestBaseTypeForParameterInConstructor
    public MainPage(NavigationView navView)
    {
        this.InitializeComponent();

        Panes.Pane1 = navView;
    }
}

public sealed partial class NavigationView : UserControl
{
    public NavigationViewModel ViewModel { get; }
    public NavigationView(NavigationViewModel viewModel)
    {
        ViewModel = viewModel;
        this.InitializeComponent();
        DataContext = ViewModel;
    }
}

<UserControl x:Class="ChromeMusicLab.Views.WebViewWrapper"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:ChromeMusicLab.Views"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d">

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <CommandBar Grid.Row="0" Background="Transparent" IsOpen="False" DefaultLabelPosition="Right">
            <AppBarButton Icon="Add" Label="Add" />
            <AppBarButton Icon="Edit" Label="Edit" />
            <AppBarButton Icon="Share" Label="Share" />
            <CommandBar.SecondaryCommands>
                <AppBarButton Icon="Setting" Label="Settings">
                    <AppBarButton.KeyboardAccelerators>
                        <KeyboardAccelerator Modifiers="Control" Key="I" />
                    </AppBarButton.KeyboardAccelerators>
                </AppBarButton>
            </CommandBar.SecondaryCommands>
        </CommandBar>
        <WebView2 x:Name="Web" Grid.Row="1"
                  Source="https://www.microsoft.com"
                  HorizontalAlignment="Stretch"
                  VerticalAlignment="Stretch" />
    </Grid>
</UserControl>

    public sealed partial class WebViewWrapper : UserControl
    {
        public WebViewWrapper()
        {
            this.InitializeComponent();
        }
    }

As you can see, I do not get the WebViewWrapper control from DI, but let the Xaml parser handle it like normal. If I comment out the WebView2, I don't get the errors.

[victorthoang]

hello @sharpninja

Are you still looking for an answer to your question? If you still need a response, we can turn this into an Issue with a Question tag (which is typically how we address questions and bugs.

The discussion thread might be more useful for off topic questions or non-issue related inquiries!

Let me know if you'd like me to create an issue from this discussion, or if you'd prefer to add it. Thanks!