Question

problems downloading multiple pdf documents

Asked by: Fosterlo7

my application uses c# to download pdf documents from a website and saves them on my local drive. Some pdfs come through fine but some are corrupt.  Can someone look at my code and assist me.
thanks

WebClient webClient = new WebClient();
Uri uriA = new Uri(WebUrl);
webClient.DownloadFileAsync(uriA, tempFullFile);
HttpWebRequest request = HttpWebRequest.Create(WebUrl) as HttpWebRequest;
request.ServicePoint.ConnectionLimit = 100;
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
if (response.Headers["Content-Type"].StartsWith("application/pdf"))
{
// saves the file locally.
}
response.close();
webClient.Dispose();
                                  
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Asked On
2008-12-16 at 10:19:46ID23989357
Tags

c#

Topics

Programming for ASP.NET

,

Microsoft Visual C#.Net

Participating Experts
1
Points
500
Comments
2

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Answers

 

by: DropZonePosted on 2008-12-17 at 07:45:12ID: 23194325

You are using the DownloadFileAsync() method, which is non-blocking (asynchroneous).  This means that the code continues to execute without waiting for the file to complete download.  This will cause a race condition, of your code trying to send the file and destroying the WebClient object, while it may still be trying to download.

You may either want to use DownloadFile(), which is synchroneous, and will therefore wait until the file is downloaded; or create a handler for the DownloadFileCompleted event of the WebClient, which will trigger when the download is completed.

See this article for more information on this method:
      http://msdn.microsoft.com/en-us/library/ms144196.aspx

     -dZ.

20120131-EE-VQP-002

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