The service provider has not been configured yet

[AlphaCentauri1983]

I have the following problem in my WPF application: I get the following error in MainView.xaml:

The service provider has not been configured yet

This error is only visible in the xaml designer and I cannot see the SettingsView there either. The application starts normally and runs without problems.

My App.xaml.cs looks like this:

public partial class App : Application
{
    public App()
    {
        Ioc.Default.ConfigureServices(
            new ServiceCollection()
            //Services
            // ...
            //ViewModels
            .AddTransient<SettingsViewModel>()
            .AddTransient<MainViewModel>()
            .BuildServiceProvider());
    }

    protected override void OnExit(ExitEventArgs e)
    {
    }

    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);
        MainView view = new();
        view.Show();
    }
}

The data context was set in the code behind:

    public partial class SettingsView : UserControl
    {
        public SettingsView()
        {
            InitializeComponent();
            DataContext = Ioc.Default.GetRequiredService<SettingsViewModel>();
        }
    }

Doy ou have any ideas how I can solve this issue?

[Bassman2]

The error message comes from the VS Designer.
So don't set DataContext in design mode.

public partial class UsersView : UserControl
{
    public UsersView()
    {
        InitializeComponent();
        if (!DesignerProperties.GetIsInDesignMode(this))
        {
            DataContext = new UsersViewModel();
        }
    }
}