Caliburn how to load data when app is starting?-CodePudding

Net6. I'd like to show MessageBox after long operation (e.g. fetching data) when app is starting.

In version 3.2.0 this works fine. When app is starting, main view shows up, then MessageBox is made visible.
In version 4.0.173 this doesn't work: MessageBox is visible and blocks main view.

My code:

Caliburn.Micro 3.2.0
    internal class ShellViewModel : Screen
    {
        protected override async void OnInitialize()
        {
            base.OnInitialize();
            await Task.Delay(1000);
            System.Windows.MessageBox.Show("hello");
        }
    }
    
Caliburn.Micro 4.0.173
    internal class ShellViewModel : Screen
    {
        protected override async Task OnInitializeAsync(CancellationToken cancellationToken)
        {
            await base.OnInitializeAsync(cancellationToken);
            await Task.Delay(1000);
            System.Windows.MessageBox.Show("hello");
        }
    }

CodePudding user response：

I've solved this problem by event Loaded: view:

xmlns:cal="http://caliburnmicro.com"
cal:Message.Attach="[Event Loaded] = [Action Window_Loaded()]"

vm:

    public async Task Window_Loaded()
    {
        await Task.Delay(1000);
        System.Windows.MessageBox.Show("hello");
    }