CommandBase Authorizaition binding to UI

Ranjini posted on Tuesday, July 26, 2011

Please refer to this posting as a starting point - http://forums.lhotka.net/forums/p/10540/49324.aspx#49324

The suggestion to add a rule on the EditObject authorizationaction worked perfectly. However, I am now tryign to show/hide a UI link based on whether the execute action on the commandbase object is permitted. In order to do this, I added the following

public static bool CanEditObject ()

{

return Csla.Rules.BusinessRules.HasPermission(Csla.Rules.AuthorizationActions.EditObject, typeof(CommandName

)); }

However when using CanEditObject , it throws the following exception

'Business.CommandName.CanEditObject()' threw an exception of type 'System.MethodAccessException' bool {System.MethodAccessException}

JonnyBee replied on Tuesday, July 26, 2011

Not sure of what could be wrong here - but this code and unit test runs OK:

    [Serializable]
    public class LookupCustomerCommand : CommandBase<LookupCustomerCommand>
    {
        public static bool CanEditObject()
        {
          return BusinessRules.HasPermission(Csla.Rules.AuthorizationActions.EditObject, typeof(LookupCustomerCommand));
        }
 
        protected static void AddObjectAuthorizationRules()
        {
          BusinessRules.AddRule(typeof(LookupCustomerCommand),
              new Csla.Rules.CommonRules.IsInRole(AuthorizationActions.EditObject, "role1", "role2"));
        }
    }

    [TestMethod()]
    public void CanNotEditCommand()
    {
      Assert.IsFalse(LookupCustomerCommand.CanEditObject());
    }

JonnyBee replied on Wednesday, July 27, 2011

Which platform and UI technology do you get the exception on? .NET 4 or SL4 or WP?

JonnyBee replied on Thursday, July 28, 2011

Hi Ranjini,

I believe the solution for your problem is to change the AddObjectAuthorizationRules to be a public method rather than protected.

Limitations in reflection in Silverlight throws the exception when a method is not accessible for other classes (ie: protected and private).