C# – IOEXCEPTION in C# compact framework when saving image

ccompact-frameworknetsmartphone

I'm saving an image from a web request and something really weird is happening. On roughly half of the 8,000 images I'm downloading I get IOEXCEPTION errors:
ERROR_ACCESS_DENIED (5)
INVALID_PARAMETER (87)

Before I save the file using file.open, I check to make sure the file does not exist. The exception is thrown at this line of code:

fileStream = File.Open(destination, FileMode.Create, FileAccess.Write, FileShare.None);

Below is the code:

public static bool DownloadFile(string url, string destination)
{
bool success = false;

        System.Net.HttpWebRequest request = null;
        System.Net.WebResponse response = null;
        Stream responseStream = null;
        FileStream fileStream = null;

        try
        {
            request = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(url);
            request.Method = "GET";
            request.Timeout = 100000; // 100 seconds
            request.Proxy = System.Net.GlobalProxySelection.GetEmptyWebProxy();
            response = request.GetResponse();

            responseStream = response.GetResponseStream();
            fileStream = File.Open(destination, FileMode.Create, FileAccess.Write, FileShare.None);
            //fileStream = File.Create(destination);


            // read up to ten kilobytes at a time
            int maxRead = 10240;
            byte[] buffer = new byte[maxRead];
            int bytesRead = 0;
            int totalBytesRead = 0;

            // loop until no data is returned
            while ((bytesRead = responseStream.Read(buffer, 0, maxRead)) > 0)
            {
                totalBytesRead += bytesRead;
                fileStream.Write(buffer, 0, bytesRead);
            }

            // we got to this point with no exception. Ok.
            success = true;
        }
        catch (System.Net.WebException we)
        {
            // something went terribly wrong.
            success = false;
            //MessageBox.Show(exp.ToString());
            writeErrFile(we.ToString(), url);
            //Debug.WriteLine(exp);
        }
        catch (System.IO.IOException ie)
        {
            // something went terribly wrong.
            success = false;
            //MessageBox.Show(ie.InnerException.ToString());
            writeErrFile(ie.ToString(), destination + " -- " + url);
            //Debug.WriteLine(exp);
        }
        catch (Exception exp)
        {
            // something went terribly wrong.
            success = false;
            //MessageBox.Show(exp.ToString());
            writeErrFile(exp.ToString(), destination + " -- " + url);
            //Debug.WriteLine(exp);
        }
        finally
        {
            // cleanup all potentially open streams.

            if (null != responseStream)
                responseStream.Close();
            if (null != response)
                response.Close();
            if (null != fileStream)
                fileStream.Close();

        }

        // if part of the file was written and the transfer failed, delete the partial file
        if (!success && File.Exists(destination))
            File.Delete(destination);

        return success;
    }

I've been stuck on this for a couple of days. Any help would be appreciated in unimaginable orders of magnitude.

Best Answer

Use file.exists() to check if the file exists and file.create or file.openwrite to write the file.

From your code I can't see how you are checking the file exists.

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