Creating background download task queue for windows 8.1 store app

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I am working on a Windows 8.1 store app.

I have a Download task which downloads a file in background from Google Drive.

Can someone please help me with any pointers how I can create download task queues and maybe get the progress of the download tasks and display it on some page while the tasks are getting executed in the background.

Appreciate any help.

Thanks,
Deepak

What I have tried:

C#

public static void StartDownload(DriveService service, File file)
{
	Task.Run(async () => await DownloadFile(service, file));
}


public static async Task<IDownloadProgress> DownloadFile(DriveService service, File file)
{
    var request = service.Files.Get(file.Id);
    var stream = new MemoryStream();
    IDownloadProgress progress = null;
    if (file.MimeType != "application/vnd.google-apps.folder")
    {
        progress = await request.DownloadAsync(stream, CancellationToken.None);
        SaveToLocalFolderAsync(stream, file.Name);
    }
    return progress;
}

Posted 25-Dec-16 8:39am

deepaksharma0390

Updated 25-Dec-16 10:31am

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Afzaal Ahmad Zeeshan · Accepted Answer · 2016-12-25T10:31:00

I did see all of your comments on my answer to your previous question, unfortunately, system is down to support comments etc.

A most simple method, if you just need to control when all of the background tasks finish, you can use Task.WhenAll() or Task.WaitAll() (you cannot await void), you can await these calls for asynchronous approach.

C#

// for a generic approach;
var downloads = new List<Task>();

// Add new ones to collection, 
downloads.Add(Task.Run(() => {
   // code.
}));

// You can add them in a loop, or private function, handler etc.

Then awaiting them all will be like,

C#

Task.WhenAll(downloads.ToArray()); // waits

To check the progress, you might want to run the logic to see how much file has been downloaded, what the speed is etc. That is a bit algorithmic. IProgress[^] interface can be used to configure the progress, but only if you need.

For even in-depth overview, read Task Class (System.Threading.Tasks)[^].
Task-based Asynchronous Pattern (TAP)[^]
Task.WhenAll Method (Task[]) (System.Threading.Tasks)[^]

Just a 1000ft overview is here, c# - Check progress of download operation which started in background task - Stack Overflow[^]

For more control over this, you will need to use Thread (which are not as much handier as Task), but gives more control.