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AnswerRe: PredicateBuilder Question Pin
Eddy Vluggen15-Oct-21 14:44
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QuestionTask.WhenAll ConfigureAwait Question Pin
Kevin Marois14-Oct-21 12:57
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AnswerRe: Task.WhenAll ConfigureAwait Question Pin
Richard Deeming14-Oct-21 23:15
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GeneralRe: Task.WhenAll ConfigureAwait Question Pin
Kevin Marois15-Oct-21 4:53
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GeneralRe: Task.WhenAll ConfigureAwait Question Pin
Richard Deeming15-Oct-21 5:59
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GeneralRe: Task.WhenAll ConfigureAwait Question Pin
Kevin Marois15-Oct-21 6:29
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GeneralRe: Task.WhenAll ConfigureAwait Question Pin
Kevin Marois15-Oct-21 8:08
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GeneralRe: Task.WhenAll ConfigureAwait Question Pin
Richard Deeming17-Oct-21 21:58
mveRichard Deeming17-Oct-21 21:58 
If you have a large or unknown number of tasks, or you don't care about the value (if any) returned by the tasks, then Task.WhenAll is usually the simplest option. But it's not required to get multiple tasks running at the same time.

If you're just loading data and setting the properties on your view-models, you generally don't need to be running on the UI thread. If you're updating a collection, you might need to use BindingOperations.EnableCollectionSynchronization[^] to enable updates from a background thread; but most property changes on a view-model will just work from any thread.

But as you discovered, you will need to be running on the UI thread to show another view. Therefore, you probably want to split the job into multiple tasks: a top-level task which kicks off the loading tasks, awaits Task.WhenAll to wait for them to finish (without using ConfigureAwait), and then displays the dialog; and multiple sub-tasks which load the data and update the view-model, which can use .ConfigureAwait(false).

Eg:
C#
private async Task LoadProjects(VendorsByProjectAndJobReportViewModel vm)
{
    var projects = await Task.Run(() => AppCore.BizObject.GetProjectHeaders(AppCore.AppCompany.Id).ToList()).ConfigureAwait(false);
    vm.Projects = projects;
}

private async Task LoadJobs(VendorsByProjectAndJobReportViewModel vm)
{
    var jobs = await Task.Run(() => AppCore.BizObject.GetJobListHeaders(AppCore.AppCompany.Id).ToList()).ConfigureAwait(false);
    vm.Jobs = jobs;
}

private async Task ShowVendorsByProjectAndJobReport()
{
    WaitIndicatorVisibility = Visibility.Visible;
    
    var dialogVm = new VendorsByProjectAndJobReportViewModel();
    var tasks = new List<Task>
    {
        LoadProjects(dialogVm),
        LoadJobs(dialogVm),
    };
    
    await Task.WhenAll(tasks); // NB: No "ConfigureAwait" here
    DialogResultEx result = DialogService.ShowDialog(dialogVm, typeof(MainWindowView));
}




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GeneralRe: Task.WhenAll ConfigureAwait Question Pin
Kevin Marois18-Oct-21 4:01
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QuestionCodility fails to compile even though it compiles in VS code? Pin
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AnswerRe: Codility fails to compile even though it compiles in VS code? Pin
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Generalpass array to function Pin
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GeneralRe: pass array to function Pin
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QuestionCreating An Async Method Pin
Kevin Marois7-Oct-21 11:02
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AnswerRe: Creating An Async Method Pin
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GeneralRe: Creating An Async Method Pin
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GeneralRe: Creating An Async Method Pin
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GeneralRe: Creating An Async Method Pin
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GeneralRe: Creating An Async Method Pin
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GeneralRe: Creating An Async Method Pin
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GeneralRe: Creating An Async Method Pin
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GeneralRe: Creating An Async Method Pin
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Question(xaml, wpf) ScrollViewer Binding confusion (beginner) (ANSWERED) Pin
Maximilien6-Oct-21 9:50
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SuggestionRe: (xaml, wpf) ScrollViewer Binding confusion (beginner) Pin
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