using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Without authorization:");

        DoSomething(            

            (i,u) => { Console.WriteLine("Alpha " + i); return true; },

            (i,u) => { Console.WriteLine("Beta " + i); return true; }           

            );  

        Console.WriteLine();

        Console.WriteLine("Rockstar activity:");

        DoSomething(

            new Authorizer("rockstar").ActionToDo,

            (i,u) => { Console.WriteLine("Alpha " + i); return true; },

            (i,u) => { Console.WriteLine("Beta " + i); return true; }           

            );                      

        Console.WriteLine();

        Console.WriteLine("Guest activity:");       

        DoSomething(

            new Authorizer("guest").ActionToDo,

            (i,u) => { Console.WriteLine("Alpha " + i); return true; },

            (i,u) => { Console.WriteLine("Beta " + i); return true; }           

        );  

    }

    // third-party framework. cannot change the signature

    public static void DoSomething(params Func<int, string, bool>[] actions)

    {

        var basicAuthUser = "davegrohl"; // obtained from browser's basic authentication        

        for(int i = 0; i < actions.Length; ++i)

        {

            var a = actions[i];

            bool okToContinue = a(new Random().Next(10), basicAuthUser);

            if (!okToContinue)

                break;

        }

    }

​

}

​

​

​

class Authorizer

{

    public string RoleAllowed { get; set; }

    public Authorizer(string roleAllowed)

    {

        this.RoleAllowed = roleAllowed;

    }

    string GetRole(string basicAuthUser)

    {

        return "rockstar"; // davegrohl's role fetched from database

    }

    public bool ActionToDo(int i, string basicAuthUser) 

    {

        // Database operation here.

        // Get the role of basicAuthUser

        var role = this.GetRole(basicAuthUser);

        return role == this.RoleAllowed;    

    }

}

​

​