/// <summary>
/// public method to return single instance of class
/// </summary>
/// <returns>single instance of class</returns>
public static TransferUrlList GetInstance()
{
// see if instance already created
if (instance == null)
{
// create the instance
instance = new TransferUrlList();
urls = new StringDictionary();
String xmlFilePath = HttpContext.Current.Request.MapPath(ConfigurationSettings.AppSettings.Get("TransferURL"));
// read list of transfer URLs from XML file
try
{
using (XmlReader reader = XmlReader.Create(xmlFilePath))
{
while (reader.Read())
{
if (reader.LocalName == "item")
{
// populate StringDictionary
urls.Add(reader.GetAttribute("name"), reader.GetAttribute("url"));
}
}
}
}
catch (Exception ex)
{
throw new Exception("Transfer url list: Cannot load URL transfer list", ex);
}
}
return(instance);
}
/// <summary>
/// use features of the request (user, browser, IP address, etc.)
/// to decide how to handle the request, and which page to show
/// this example looks for specific items in the query string
/// that indicate the required target (such as "CustomerList")
/// using a dictionary of values loaded from an XML disk file
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void MyPreRequestHandler(Object sender, EventArgs e)
{
// get Singleton list of transfer URLs
TransferUrlList urlList = TransferUrlList.GetInstance();
// get the current request query string
String reqTarget = HttpContext.Current.Request.QueryString["target"];
if (reqTarget != null && reqTarget != String.Empty)
{
// see if target value matches a transfer URL
// by querying the list of transfer URLs
// method returns the original value if no match
String transferTo = urlList.GetTransferUrl(reqTarget);
try
{
// transfer to the specified URL
HttpContext.Current.Server.Transfer(transferTo, true);
}
catch { }
}
}