Dialog (`ShowAsync()`) in `MainPage.Loaded` event

[Basyras]

Current behavior

Calling ContentDialog.ShowAsync() in MainPage.Loaded event does not showing dialog after app started (Only in Wasm project).

Expected behavior

ContentDialog should be displayed.

How to reproduce it (as minimally and precisely as possible)

Create project with blank Uno app template and add code in MainPage.xaml.cs:

        public MainPage()
        {

            this.InitializeComponent();
            this.Loaded += async (s, a) =>
            {
                var dialog = new ContentDialog();
                await dialog.ShowAsync();
            };
       }

Workaround

simple await Task.Delay(1000); before calling await dialog.ShowAsync(); solve this issue

Environment

Nuget Package:

• [x] Uno.UI / Uno.UI.WebAssembly / Uno.UI.Skia
• [ ] Uno.WinUI / Uno.WinUI.WebAssembly / Uno.WinUI.Skia
• [ ] Uno.SourceGenerationTasks
• [ ] Uno.UI.RemoteControl / Uno.WinUI.RemoteControl
• [ ] Other:

Nuget Package Version(s): NETStandard.Library: 2.0.3 Uno.UI.RemoteControl: 3.2.0 Uno.UI.WebAssembly: 3.2.0 Uno.Wasm.Bootstrap: 1.3.4 Uno.Wasm.Bootstrap.DevServer: 1.3.4

Affected platform(s):

• [ ] iOS
• [ ] Android
• [ ] WebAssembly renderers for Xamarin.Forms
• [ ] macOS
• [ ] Windows
• [ ] Build tasks
• [ ] Solution Templates

Skia and WASM covered by #15207

IDE:

• [ ] Visual Studio 2017 (version: )
• [x] Visual Studio 2019 (version: 16.8.1)
• [ ] Visual Studio for Mac (version: )
• [ ] Rider Windows (version: )
• [ ] Rider macOS (version: )
• [ ] Visual Studio Code (version: )

Relevant plugins:

• [ ] Resharper (version: )

Anything else we need to know?

This issue may be releated to #3519 (if yes we can close my issue)

[jeromelaban]

Thanks for the report!

It is indeed related to #3519. The Loaded event is not raised at the proper time, causing this issue.

[Youssef1313]

Will be fixed with https://github.com/unoplatform/uno/pull/14528 for Skia and Wasm (other platforms need to be tested)