using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; //info http://net-informations.com/q/faq/dictionary.html //Question : How to create a dictionary, with a list as value //Answer : Create List first, Add to dictionairy, alsway keep in mind when working with the Value-part //that this is a list and not a simple variable //Link to the question : https://www.sololearn.com/Discuss/1732229/c-dictionary-s-and-lists namespace SoloLearn { class Program { static List CoinList1 = new List(); static List CoinList2 = new List(); static List CoinList3 = new List(); static void Main(string[] args) { //the dictionairy Dictionary> dict = new Dictionary>(); FillTheCoinList(); //fill the dictionairy //add element to dictionairy dict.Add("CoinList1", CoinList1); dict.Add("CoinList2", CoinList2); dict.Add("CoinList3", CoinList3); //display dictionairy //PrintListOfDictionairyKeys(dict); //PrintListOfDictionairyValues(dict); PrintListOfDictionairyKeyValuePairs(dict); //remove element from dictionairy dict.Remove("CoinList1"); //remove by key /PrintListOfDictionairyKeys(dict); } static public void FillTheCoinList() { //first three coins Coin Coin1 = new Coin(9,2); Coin Coin2 = new Coin(8,3); Coin Coin3 = new Coin(7,4); //fill the list of coins CoinList1.Add(Coin1); CoinList1.Add(Coin2); CoinList1.Add(Coin3); //second three coins Coin Coin4 = new Coin(1,4); Coin Coin5 = new Coin(2,5); Coin Coin6 = new Coin(3,6); //fill the list of coins CoinList2.Add(Coin4); CoinList2.Add(Coin5); CoinList2.Add(Coin6); //third three coins Coin Coin7 = new Coin(4,7); Coin Coin8 = new Coin(5,8); Coin Coin9 = new Coin(6,9); //fill the list of coins CoinList3.Add(Coin7); CoinList3.Add(Coin8); CoinList3.Add(Coin9); } static void PrintListOfDictionairyKeys(Dictionary> ThisDict) { foreach (var key in ThisDict.Keys) { Console.WriteLine(key); } } static void PrintListOfDictionairyValues(Dictionary> ThisDict) { foreach (var value in ThisDict.Values) { Console.WriteLine("A Coinlist"); foreach (Coin CoinValue in value) { Console.WriteLine("A Coin"); Console.WriteLine(CoinValue.X); Console.WriteLine(CoinValue.Y); } } } static void PrintListOfDictionairyKeyValuePairs(Dictionary> ThisDict) { foreach (var item in ThisDict) { Console.WriteLine(item.Key); foreach (Coin CoinValue in item.Value) { Console.WriteLine("A Coin"); Console.WriteLine(CoinValue.X); Console.WriteLine(CoinValue.Y); } } } } class Coin { public Coin(int x, int y) { X = x; Y = y; } public int X {get; set;} public int Y {get; set;} } }

C# : dictonairies with lists inside