How to deal with exceptions when using WebClient.DownloadFileAsync

Question

I am downloading some files from the internet using a WebClient in the following way:

try  
{
   ManualResetEvent mr = new ManualResetEvent(fals         


        

Answer 1

You should use await and DownloadFileTaskAsync:

try  
{

   using (WebClient wc = new WebClient())
   {

         await  wc.DownloadFileTaskAsync(new Uri(string.Format("{0}/{1}", Settings1.Default.WebPhotosLocation, Path.GetFileName(f.FullName))), filePath);

    }
}
catch (Exception ex)
{
   //Catch my error here and handle it (display message box)
}

DownloadFileAsync uses Event-based Asynchronous Pattern, you can't catch the exception, you can get exception throw AsyncCompletedEventArgs.Error Property