Tutorial :Why should we choose PrincipalPermission over IsInRole()?



Question:


Q1 - I’m not sure I understand why we should prefer to use PrincipalPermission.Union() ( or PrincipalPermission.Intersect() ) instead of IsInRole()? If anything, calling IsInRole() several times requires less code than creating multiple PrincipalPermission objects and merging them into one via Union() ( or Intersect() )?


Q2 - One constructor overload of PrincipalPermission object also specifies a IsAuthenticated flag that tells Demand() to verify if user is authenticated. Wouldn’t using that flag only be useful in situations where first two parameters ( name and role ) are both null?


thanx


Solution:1

Q1. - RE: PrincipalPermission methods vs. IPrincipal.IsInRole(..)

The two function calls make a PrincipalPermission that has the union or intersection of the roles you give it. Thus you end up with a principal that has a very specific set of demands, which you can then call IsInRole() upon. Note that doing this will hit your role provider which may be an SQL server or the active directory and thus have latency involved, so you don't want to do it all the time.

Q2. - RE: PrincipalPermission authentication

Authenticated indicates that the user is logged in against your provider. You may want this if you need only auditing on your application, confirming the user is logged in to your role provider will mean that you can log who they are etc.

You are correct in saying it's only useful where you don't care about who the user is, only that they are logged in.


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