Manage ProgressBar from a DownloadClass

Question

I have a ProgressBar in my MainPage.xaml:

<ProgressBar HorizontalAlignment="Center"
                 Height="90" Margin="0,-30,0,0" 
                 VerticalAlignment="Center" 
                 Width="600" x:Name="BarProgress" />

And then in MainPage.xaml.cs there is the code for downloading data:

public async Task Download(string fileName, string fileId)
private async Task HandleDownloadAsync(DownloadOperation download, bool start)
private async Task DiscoverActiveDownloadsAsync()
private void DownloadProgress(DownloadOperation download)
        {            
            double percent = 100;
            if (download.Progress.TotalBytesToReceive > 0)
            {
                percent = download.Progress.BytesReceived * 100 / download.Progress.TotalBytesToReceive;
            }

            BarProgress.Value = percent;                        
        }

And it works great! I can see the ProgressBar proceeds until the download ends!

But if i want to create a new class such as DownloadData.cs and then put inside all the code for downloading data, how can i invoke the BarProgress.Value?!? I've done a lot of tentatives, such as MainPage.BarProgress.Value = percent, but i receive a lot of errors because BarProgress is inaccesible...

Answer 1

Hi JackieLeManchic,

ProgressBar.Value is inaccessiable? The Value property of ProgressBar.Value should be both readable and writable. Maybe you could try to binding a value instead of set a value.

Best Regards,

--James

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Answer 2

Hi James, thank you for your answer...how can i access the ProgressBar from a generic class? MainPage.BarProgress.Value = percent, is it the right way?!

Could you provide a simple example for binding that value?!?

Thank you in advance!

Answer 3

Hi Jackie,

Take a look at this sample: http://code.msdn.microsoft.com/windowsapps/Basic-Controls-29318599.The second scenario is talking about ProgressBar, and the value is binding to a SliderBar.

Your code can be used to set the value for progressbar, check what is the maximum of your progressbar, if max is 100, but you set a percentage value to it, surely you will see nothing.

Best Regards,

--James

---

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Answer 4

James, i've seen the example you suggested me and it's very interesting!

The value property of the ProgressBar is changed at RunTime through a Slider element. But if i try to Bind the value of the progress bar in my DownloadData.cs class i'm not able...Do you know some other example for binding data at runtime?

I already use Binding data but for static resource...here instead the value of the progress bar change at runtime and here starts the headache!!!

Answer 5

Hi Jackie,

A tutorial for you to know the data binding stuff: Quickstart: Data binding to controls.

More data binding samples can be found here: XAML data binding sample.

Best Regards,

--James

---

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Please remember to "Mark as Answer" the responses that resolved your issue. It is a common way to recognize those who have helped you, and makes it easier for other visitors to find the resolution later.