ASP.NET - using System.IO.File.Delete () to delete files from a directory inside wwwroot?

Question

I have an ASP.NET SOAP web service whose web method creates a PDF file, writes it to the "Download" directory of the application, and returns the URL to the user. The code:

//Create the map images (MapPrinter) and insert them on the PDF (PagePrinter).
MemoryStream mstream = null;
FileStream fs = null;
try
{
    //Create the memorystream storing the pdf created.
    mstream = pgPrinter.GenerateMapImage();
    //Convert the memorystream to an array of bytes.
    byte[] byteArray = mstream.ToArray();
    //return byteArray;

    //Save PDF file to site Download folder with a unique name.
    System.Text.StringBuilder sb = new System.Text.StringBuilder(Global.PhysicalDownloadPath);
    sb.Append("\\");
    string fileName = Guid.NewGuid().ToString() + ".pdf";
    sb.Append(fileName);
    string filePath = sb.ToString();
    fs = new FileStream(filePath, FileMode.CreateNew);
    fs.Write(byteArray, 0, byteArray.Length);
    string requestURI = this.Context.Request.Url.AbsoluteUri;
    string virtPath = requestURI.Remove(requestURI.IndexOf("Service.asmx")) + "Download/" + fileName;
    return virtPath;
}
catch (Exception ex)
{
    throw new Exception("An error has occurred creating the map pdf.", ex);
}
finally
{
    if (mstream != null) mstream.Close();
    if (fs != null) fs.Close();
    //Clean up resources
    if (pgPrinter != null) pgPrinter.Dispose();
}

Then, in the Global.asax file of the web service, I set the timer in the Application_Start event listener. In the Timer ElapsedEvent listener, I look for any files in the download directory that are older than the timer interval (for testing = 1 min., For deployment ~ 20 min.) And delete them. The code:

//Interval to check for old files (milliseconds), also set to delete files older than now minus this interval.
private static double deleteTimeInterval;
private static System.Timers.Timer timer;
//Physical path to Download folder.  Everything in this folder will be checked for deletion.
public static string PhysicalDownloadPath;

void Application_Start(object sender, EventArgs e)
{
    // Code that runs on application startup
    deleteTimeInterval = Convert.ToDouble(System.Configuration.ConfigurationManager.AppSettings["FileDeleteInterval"]);
    //Create timer with interval (milliseconds) whose elapse event will trigger the delete of old files
    //in the Download directory.
    timer = new System.Timers.Timer(deleteTimeInterval);
    timer.Enabled = true;
    timer.AutoReset = true;
    timer.Elapsed += new System.Timers.ElapsedEventHandler(OnTimedEvent);

    PhysicalDownloadPath = System.Web.Hosting.HostingEnvironment.ApplicationPhysicalPath + "Download";
}

private static void OnTimedEvent(object source, System.Timers.ElapsedEventArgs e)
{
    //Delete the files older than the time interval in the Download folder.
    var folder = new System.IO.DirectoryInfo(PhysicalDownloadPath);
    System.IO.FileInfo[] files = folder.GetFiles();
    foreach (var file in files)
    {
        if (file.CreationTime < DateTime.Now.AddMilliseconds(-deleteTimeInterval))
        {
            string path = PhysicalDownloadPath + "\\" + file.Name;
            System.IO.File.Delete(path);
        }
    }
}

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Answer 1

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Answer 2

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Answer 3

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http://msdn.microsoft.com/en-us/library/system.io.isolatedstorage.isolatedstorage.aspx

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