Csharp/CSharp Tutorial/Security/Role

Checking for access in a role

<source lang="csharp">using System; using System.Collections.Generic; using System.IO; using System.IO.IsolatedStorage; using System.Net; using System.Net.Sockets; using System.Reflection; using System.Security; using System.Security.AccessControl; using System.Security.Policy; using System.Security.Permissions; using System.Security.Principal; using System.Text; public class MainClass {

   public static void Main()
   {
       IPrincipal user = Thread.CurrentPrincipal;
       if (!user.IsInRole("Administrators"))
           Console.WriteLine("User not in the "admin" role");
       else
           Console.WriteLine("User is an "admin"");
   }

}</source>

User not in the "admin" role

Declarative role-based security

<source lang="csharp">using System; using System.IO; using System.Security.Permissions; [PrincipalPermissionAttribute(SecurityAction.Demand, Role="Administrators")] class MainClass {

 public static void Main() 
 {
   FileStream fsOut = File.Create(@"c:\\temp\\test.txt");
   StreamWriter sw = new StreamWriter(fsOut);
   sw.WriteLine("str");
   sw.Flush();
   sw.Close();
 }

}</source>

Unhandled Exception: System.Security.SecurityException: Request for principal permission failed.
   at System.Security.Permissions.PrincipalPermission.ThrowSecurityException()
   at System.Security.Permissions.PrincipalPermission.Demand()
   at System.Security.PermissionSet.DemandNonCAS()
   at MainClass.Main()
The action that failed was:
Demand
The type of the first permission that failed was:
System.Security.Permissions.PrincipalPermission
The first permission that failed was:
<IPermission class="System.Security.Permissions.PrincipalPermission, mscorlib, Version=2.0.0.0, Cult
ure=neutral, PublicKeyToken=b77a5c561934e089"
version="1">
<Identity Authenticated="true"
Role="Administrators"/>
</IPermission>
The demand was for:
<IPermission class="System.Security.Permissions.PrincipalPermission, mscorlib, Version=2.0.0.0, Cult
ure=neutral, PublicKeyToken=b77a5c561934e089"
version="1">
<Identity Authenticated="true"
Role="Administrators"/>
</IPermission>
The assembly or AppDomain that failed was:
mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089