Permission request error in C# web application

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I am trying to develop a simple web app to load an xml file from the MetOffice service and use its content to form a url to a rainfall map. I am getting the permission request error when I try to load the xml document with the xml from the service. I have done this and much more on a desktop application to do the same thing and have never had this error. How can I solve it? I am writing it C#, thank you.

C#

private void save_Click(object sender, RoutedEventArgs e)
        {
            XmlDocument capabilities = new XmlDocument();
            capabilities.Load("http://datapoint.metoffice.gov.uk/public/data/layer/wxobs/all/xml/capabilities?key=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
            TimeSteps.Items.Clear();

            for (int x = 0; x < capabilities.SelectNodes("//Layer[@displayName='Rainfall']/Service/Times/Time").Count; x++)
            { TimeSteps.Items.Add(capabilities.SelectNodes("//Layer[@displayName='Rainfall']/Service/Times/Time")[x].InnerText); }            
            {
                ImageLayer.Source = new BitmapImage(new Uri("http://datapoint.metoffice.gov.uk/public/data/layer/wxobs/RADAR_UK_Composite_Highres/png?TIME=" + TimeSteps.Items[0].ToString() + "Z&key=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"));
                TimeSteps.SelectedIndex = 0;
            }
        }

Error:

SecurityException was unhandled in user code: Request for the permission of type 'System.Net.WebPermission, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

Posted 15-Oct-13 11:50am

Henry Hunt

Updated 15-Oct-13 11:58am

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Comments

Bernhard Hiller 16-Oct-13 2:31am

If you download the xml file to disk, and then load that file, do you get the same error, or a different one, or none at all?
When I try to open the URL in Firefox, I receive an empty document only (well, I do not have your key...). Check that you get a document with contents.

Henry Hunt 16-Oct-13 2:44am

Nope same error when I save it to the disk and use that instead. Is it something to do with the security rights of the application or code? But this time it is a request for a FileIOPermission not a web one I just noticed.

Bernhard Hiller 16-Oct-13 2:55am

Need exact information: do you get the error when you request the file for download, or when you try to open the downloaded file?

Henry Hunt 16-Oct-13 3:00am

In both errors, it is when I load the XmlDocument capabilities with either a local file or a file on the web. So it is when I request it I suppose.

Loading a file from the web: Request for the permission of type 'System.Net.WebPermission, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

Loading a local file: Request for the permission of type 'System.Security.Permissions.FileIOPermission, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

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Mart Rijkers · Answer 1 · 2013-10-16T23:35:00

Solution 1

For testing purposes, set your trust level to Full in the web.config. If this works, use this information: http://msdn.microsoft.com/en-us/library/tkscy493(VS.80).aspx to configure the trust level in the proper way.

Posted 16-Oct-13 23:35pm

Mart Rijkers