在 C# Caliburn Micro WPF 中异步和等待获取 HttpRequest 时更新 ProgressBar

Question

I hope to update the progress bar status while downloads string from HttpGet Request.
While fetching data in OnActivate Methods of Screen Class, progress is not updating.

Here is my code of the screen.

public class LoadingAccountInfoViewModel:Screen, INotifyPropertyChanged
    {
        private readonly IEventAggregator _eventAggregator;

        // Loading Progrss Bar...
        private int loadingAccountInfoProgressBar;
        public int LoadingAccountInfoProgressBar
        {
            

            get { return loadingAccountInfoProgressBar; }
            set
            {
                if (loadingAccountInfoProgressBar == value)
                {
                    return;
                }
                loadingAccountInfoProgressBar = value;
                NotifyOfPropertyChange(() => LoadingAccountInfoProgressBar);
            }
        }

        public LoadingAccountInfoViewModel(IEventAggregator eventAggregator) {
            _eventAggregator = eventAggregator;
        }

        protected async override void OnInitialize()
        {
            await Task.Factory.StartNew(() =>
            {
                loadingAccountInfoProgressBar = 2;
                for (int i = 0; i < 5; i++)
                {
                    loadingAccountInfoProgressBar += 10;
                }
            }, TaskCreationOptions.AttachedToParent);
        }



        protected override async void OnActivate()
        {
            base.OnActivate();
            User currentUser = Global.currentUser;
            XCService xcService = new XCService();
 
            LiveStream[] liveStreams = await xcService.GetLiveStreams(currentUser.username, currentUser.password, "get_live_streams");
            VodStream[] vodStreams = await xcService.GetVodStreams(currentUser.username, currentUser.password, "get_vod_streams");
            SerieStream[] serieStreams = await xcService.GetSerieStreams(currentUser.username, currentUser.password, "get_series");

            // loadingAccountInfoProgressBar += 10;

            _eventAggregator.PublishOnUIThread(new LoadingInfoDoneMessage());

        }

        protected override void OnDeactivate(bool close)
        {
            base.OnDeactivate(close);
        }
    }

The xaml of UserControl about this class is like this:

<UserControl x:Class="ProIPTV.Pages.Content.Views.LoadingAccountInfoView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:ProIPTV.Pages.Content.Views"
             mc:Ignorable="d" >
    <Grid HorizontalAlignment="Center" VerticalAlignment="Center">
        <StackPanel >
            <Image Source="logo.png" Height="59" />
            <TextBlock Text="s t r i m o" FontSize="68" TextAlignment="Center" Foreground="#808182" Margin="0,0,0,188" />
            <TextBlock Text="LOADING ACCOUNT" FontSize="30" Foreground="#808182" TextAlignment="Center" Margin="0,0,0,62.5"/>
            <ProgressBar x:Name="LoadingAccountInfoProgressBar" Value="{Binding Path=LoadingAccountInfoProgressBar}" Style="{DynamicResource CornerProgressBar}" Height="12" Width="592" Foreground="#80F5F5F5"/>
        </StackPanel>
    </Grid>
</UserControl>

I did fetching Data with HttpGetRequest in OnActivate Method.

And ProgressBar status Updating is in OnInitialize() Method.

Please help me to fix update progress bar report while fetching data.

I am a new in Caliburn Micro WPF MVVM. So please guide me how to fix.

Answer 1

I used IProgress and send IProgress Status as a Paramter when I call the asynchronize Function.

You can get the best solution in @TimCorey's Video.

Here is the link. Asyncronize Downloading with ProgressBar Updating

I hope this would help you.