Question

I have a Silverlight 4 / C# project I’m working on in Visual Studio. I made an XML data file by right clicking on the project >> Add New Item >> Xml File. I then try to open the file:

        StreamReader streamReader = new StreamReader("data.xml");

However, this gives a security exception. How can I get around this, or grant the necessary permissions?

Answer 1

That constructor of StreamReader is expecting a file path into the local file system, which is only available out of browser with elevated trust.

Instead you should be using Application.GetResourceStream:-

Stream stream = Application.GetResourceStream(new Uri("data.xml", UriKind.Relative));
StreamReader reader = new StreamReader(stream);

However I expect you really just want this in an XDocument, you bypass this StreamReader stage:-

XDocument doc = XDocument.Load(stream);

BTW, I personally would leave the XML as Content in the Xap rather than embedding it in the assembly.