Windows Store应用程序-在下载类中使用进度栏

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.xaml.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

I would probably move the Progressbar over to a DownloadData.xaml usercontrol. That way, every time you have download data, it has it's own progressbar that can be accessed from the code behind. If you really don't want to do that, another way might be to a search for the control and try and grab it that way. Some useful tips for that are here: Find controls . Edit: Create a subfolder to your project for UserControls Right-click on your project and add User Control. This will add a xaml page and a xaml.cs code behind page. Next you want to add the control as explained here . That should do it.