WebClient.DownloadFileAsync - Download files one at a time

Question

I am using the code below to download multiple attachments from a TFS server:

foreach (Attachment a in wi.Attachments)
{    
    WebClient wc = new WebClient         


        

Answer 1

To simplify the task you can create separated attachment list:

list = new List(wi.Attachments);

where list is private field with type List. After this you should configure WebClient and start downloading of first file:

if (list.Count > 0) {
   WebClient wc = new WebClient();
   wc.Credentials = (ICredentials)netCred;
   wc.DownloadFileCompleted += new AsyncCompletedEventHandler(wc_DownloadFileCompleted);
   wc.DownloadFileAsync(list[0].Uri, @"C:\" + list[0].Name);
}

Your DownloadFileComplete handler should check if not all files already downloaded and call DownloadFileAsync again:

void wc_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e) {
   // ... do something useful 
   list.RemoveAt(0);
   if (list.Count > 0)
      wc.DownloadFileAsync(list[0].Uri, @"C:\" + list[0].Name);
}

This code is not optimized solution. This is just idea.