Csharp/CSharp Tutorial/Security/Role

Checking for access in a role

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"");
    }
}

User not in the "admin" role

Declarative role-based security

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();
  }
}

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