Security Assembly Declaration does nothing?

Question

I am trying to restrict the permissions my assembly has using Security Declarations. I have the follow example:

 [assembly: UIPermission(SecurityAction.RequestOptional,Unrestricted = true)]
[assembly: FileIOPermission(SecurityAction.RequestOptional, Read = @"C:\Hello.txt")]
class Program
{
    static void Main(string[] args)
    {
        // Create a file
        TextWriter tw = new StreamWriter(@"C:\Hello.txt");
        tw.WriteLine("Hello, world!");
        tw.Close();

        // Display the text of the file
        TextReader tr = new StreamReader(@"C:\Hello.txt");
        Console.WriteLine(tr.ReadToEnd());
        tr.Close();

        Console.ReadLine();
    }
}

The second line in the main() is writing to the file that explicitly set to 'read only' permissions (at least I thought). Running this example does not result in a security exception thrown. Why is that?

Thanks!

Answer 1

Presumably your app is running with full-trust. In full trust granular CAS permissions are not checked .