using System;

using System.Collections.Generic;

​

public class Gamer

{

    public int HoursPlayeedPerWeek;

    // Going to make it so you can't change the value after it's created

    public readonly string GamerStatus;

    // In the real world, maybe this information came from a database so we want to load it as it came to us

    public Gamer(int hoursPlayedPerWeek, string gamerStatus)

    {

        HoursPlayeedPerWeek = hoursPlayedPerWeek;

        GamerStatus = gamerStatus;

    }

    // Got smarter over time and wanted to set the status based soley off the number of hours per week

    public Gamer(int hoursPlayedPerWeek)

    {

        HoursPlayeedPerWeek = hoursPlayedPerWeek;

        GamerStatus = GetGamerStatusFromHoursPlayed(hoursPlayedPerWeek);

    }

    // Nice standard method for getting the gamer status based off the number of hours played per week

    public static string GetGamerStatusFromHoursPlayed(int hoursPlayedPerWeek){

        if(hoursPlayedPerWeek <= 5){

            return "Casual";

        }

        if(hoursPlayedPerWeek >5 && hoursPlayedPerWeek < 10){

            return "Enthusiast";

        }

        return "Fanatic";

    }

    public override string ToString()

    {

        return string.Format("Hours per Week: {0}, {1}", HoursPlayeedPerWeek, GamerStatus);

    }

}

​

​

​

public class Program

{

    public static void Main()

    {

            List<Gamer> gamers = new List<Gamer> { 

                new Gamer(4, "Casual"),

                new Gamer(2, "Enthusiast"),

                new Gamer(10, "Enthusiast"),

                new Gamer(20, "Fanatic")

            };

​

​

            // In this very contrived example, this code will fail because you can't change an item that's being

            // enumerated - otherwise, how would the enumerator know what to do next?

            /*

            foreach (var gamer in gamers)

            {

                if (gamer.GamerStatus != Gamer.GetGamerStatusFromHoursPlayed(gamer.HoursPlayeedPerWeek))

                {

                    gamer = new Gamer { HoursPlayeedPerWeek = gamer.HoursPlayeedPerWeek, GamerStatus = "Casual" };

                }

            }

            */

​

            // We're going to create a dictionary that will contain the index of the gamer in the list, and the new gamer

            // that will replace the incorrect one later

            Console.WriteLine("Original List of Gamers");

            var replacements = new Dictionary<int, Gamer>();

            foreach (var gamer in gamers)

            {

                int gamerIndex = gamers.IndexOf(gamer);

                Console.WriteLine("{0}. {1}", gamerIndex+1, gamer);

​

                if (gamer.GamerStatus != Gamer.GetGamerStatusFromHoursPlayed(gamer.HoursPlayeedPerWeek))

                {

                    replacements.Add(gamerIndex, new Gamer(gamer.HoursPlayeedPerWeek));

                }

            }

​

            // Here's where we're going to swap in the replacement objects

            foreach (var kvp in replacements)

            {

                gamers[kvp.Key] = kvp.Value;

            }

​

            Console.WriteLine("{0}Updated List of Gamers", System.Environment.NewLine, System.Environment.NewLine);

            foreach (var gamer in gamers)

            {

                int gamerIndex = gamers.IndexOf(gamer);

                Console.WriteLine("{0}. {1}", gamerIndex+1, gamer);

            }

​

    }

}