SimpleAction does not open view if execute method contains await

Hello,

I'm writing this follow-up to let you know that in v24.2 you can safely execute code from a background thread. The new BlazorApplication.InvokeAsync method will help you avoid concurrency issues in XAF Blazor apps:

C#
Task.Run(async () => { 
  await blazorApplication.InvokeAsync(async () => { 
    await Task.Delay(1000); 
    View.ObjectSpace.Refresh(); 
    Application.ShowViewStrategy.ShowMessage("Data refreshed"); 
  }); 
});

For more information, review the docs with code examples at InvokeAsync | Refresh Data in a View After a Period of Time (ASP.NET Core Blazor).

Best regards,
Herman

P.S. e.ShowViewParameters.CreatedView will still not work with this approach, but you show a view in other ways: https://docs.devexpress.com/eXpressAppFramework/112803/ui-construction/views/ways-to-show-a-view/ways-to-show-a-view.

Hello, Bernd.

Thanks for your feedback.
We have no special support for this type of scenario in the current XAF version and cannot offer good solutions, sorry. I elaborated more on this in What is the recommended way to handle async operations in ViewControllers? and Re: What is the recommended way to handle async operations in ViewControllers?, and we also keep tracking similar user requests (not many at this stage, so thank you for the sample). In certain cases, synchronous calls may help (Task.Run, TaskFactory, .Result, .GetAwaiter), but not in all the scenarios, like this one.

Should market demand for this feature/capability change, we will definitely consider it. In the meantime, we remain focused on the features/capabilities outlined in our product development roadmap.

C#
private async void Action_Execute(object sender, SimpleActionExecuteEventArgs e) {
            Task t = new Task(() => System.Threading.Thread.Sleep(100));
            t.Start();
            await t;
            var os = Application.CreateObjectSpace<TestObject>();
            var ob = os.CreateObject<TestObject>();
            e.ShowViewParameters.CreatedView = Application.CreateDetailView(os,ob);
            Console.WriteLine("Action Finished");
        }

You can find additional information on handling other asynchronous operations in XAF Blazor in the following tickets:

• "A multithreading issue is detected" exception in list view when manually assigning value to nonpersistent property
• Using ValueManager in an Blazor background service (hangfire)
• How to use asynchronous methods in the OnLoggedOn method?