Question

I am building a WP7 app in which I am having a list of objects. Object have properties like URL, filename. So the problem is how can I pass the current object to async callback method so that after download i can save it with filename. I don’t want to take global variable for filename.

Secondly I want to show progress-bar with text 1 0f 5 downloaded. How exactly can I achieve this.

Thanks in Advance!

Answer 1

Just create helper DTO class that will store all information you need.
For example,

 internal class TrackDownloadState
 {
    public string Filename;
    public string Id;
    public Uri Source;
    // and so on, all the information you need
 }

If you use Webclient, use parameter token in methods DownloadStringAsync or OpenReadAsync
Details on these methods:
http://msdn.microsoft.com/en-us/library/ms144203(v=vs.95).aspx
http://msdn.microsoft.com/en-us/library/ms144212(v=vs.95)

If you use HttpWebRequest, then use parameter state in method BeginGetResponse.
Details on that method:
http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.begingetresponse(v=vs.95).aspx