using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var foodPair = new Dictionary<string, string>{{"Pizza", "Italian"}, {"Curry", "Indian"}, {"Masala", "Indian"}};

        var teamPreference = new Dictionary<string, string>{{"Jose", "Italian"}, {"John", "Indian"}, {"Sarah", "Thai"}, {"Mary", "*"}};

        var results = new List<KeyValuePair<string, string>>();

        foreach (var teamMember in teamPreference)

        {

            switch (teamMember.Key)

            {

                case "Jose":

                    var key = foodPair.FirstOrDefault(x => x.Value == "Italian").Key;

                    results.Add(new KeyValuePair<string, string>(teamMember.Key, key));

                    break;

                case "John":

                    var getAll = foodPair.Where(x => x.Value == "Indian");

                    if (getAll.Any())

                    {

                        results.AddRange(getAll.Select(a => new KeyValuePair<string, string>(teamMember.Key, a.Key)));

                    }

​

                    break;

                case "Sarah":

                    var c = foodPair.FirstOrDefault(x => x.Value == "Thai").Key;

                    if (!string.IsNullOrEmpty(c))

                    {

                        results.Add(new KeyValuePair<string, string>(teamMember.Key, c));

                    }

​

                    break;

                case "Mary":

                    if (teamMember.Value == "*")

                    {

                        var everything = foodPair.Keys.ToList();

                        if (everything.Any())

                        {

                            results.AddRange(everything.Select(food => new KeyValuePair<string, string>(teamMember.Key, food)));

                        }

                    }

​

                    break;

            }

        }

​

        if (results.Any())

        {

            foreach (var result in results)

            {

                Console.WriteLine("{0}, {1}", result.Key, result.Value);

            }

        }

    }

}