Can't download xml from sharepoint with silverlight.

EDIT: Switched to Silverlight 4 and that got me a little further.

I have an xml that stores high scores in a sharepoint library. The sharepoint site is https and I can hit the "copy shortcut" of the xml an开发者_JAVA百科d it appears in a browser so I know I can get to it.

I am trying to pull this xml in using a webclient in silverlight as follows.

Uri url = new Uri("https://server/HighScores.xml", UriKind.Absolute);

WebRequest.RegisterPrefix("https://",System.Net.Browser.WebRequestCreator.ClientHttp); 
var client = new WebClient(); 
client.Credentials = new NetworkCredential("username", "password", "domain"); 
client.UseDefaultCredentials = false; 
client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted); 
client.DownloadStringAsync(url);

void client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
    if (e.Error == null)
    {
         string xmlData = e.Result;
         HtmlPage.Window.Alert(xmlData);
    }
}

With this code my silverlight game pops up but a windows credentials login in window comes up immediatley. When I enter my correct crdentials in here, as i did in the code behind I get the followig error.

e.Error {System.Security.SecurityException ---> System.Security.SecurityException: Security error. at System.Net.Browser.ClientHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult) at System.Net.Browser.ClientHttpWebRequest.<>c_DisplayClass5.b_4(Object sendState) at System.Net.Browser.AsyncHelper.<>c_DisplayClass2.b_0(Object sendState) --- End of inner exception stack trace --- at System.Net.Browser.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state) at System.Net.Browser.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult) at System.Net.WebClient.GetWebResponse(WebRequest request, IAsyncResult result) at System.Net.WebClient.DownloadBitsResponseCallback(IAsyncResult result)} System.Exception {System.Security.SecurityException}

Any help?

Credentials were not implemented for the WebClient until Silverlight 4. Are you using an earlier version perhaps?

Silverlight 4 – Credentials, we’ve got it! Mark Monster December 2nd, 2009

Edit: Since you are now getting security exceptions, there may be a problem with a cross domain access policy file. Here are couple of links that describe the two types of client access policy files that Silverlight/WebClient will look for.

URL Access Restrictions in Silverlight

Network Security Access Restrictions in Silverlight

If you have control of https://server/HighScores.xml you shouldn't have much trouble implementing a client access policy file.