CSharp C# Example of Dictionary with List as value

CSharp C# Example of Dictionary with List as value

Overview:

This could come into play where you would like a dictionary grouping of data and use another container, besides a class or Tuple, to hold the data.

This example uses a Dictionary of integers and each Dictionary entry contains from 0 [zero] to n strings.

using System; using System.Collections.Generic; namespace ConsoleApplication008 {     class Program     {         private static void Main(string[] args)         {             Dictionary<int, List<string>> MyDictionary = new Dictionary<int, List<string>>();             MyDictionary.Add(0, new List<string>(){"string One"});             Console.WriteLine("One = {0}", MyDictionary[0][0]);             MyDictionary[0].Add("string two");             foreach (string strNow in MyDictionary[0])             {                 Console.WriteLine(strNow);             }             Console.ReadLine();         }     } }

CSharp C# Simple Example of sorting a list on a custom object class field value

CSharp C# Simple Example of sorting a list on a custom object class field value

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace TestObjectSort {     class Program     {         static void Main(string[] args)         {             List<InfoHolder> ih = new List<InfoHolder>();             ih.Add(new InfoHolder(17, "seventeen"));             ih.Add(new InfoHolder(2, "two"));             ih.Add(new InfoHolder(3, "three"));             ih.Add(new InfoHolder(-20, "negative 20"));             ih.Add(new InfoHolder(500, "five hundred"));             ih.Add(new InfoHolder(50, "fifty"));             {                 Console.WriteLine();                 Console.WriteLine("Before sort:");                 for (int x = 0; x < ih.Count; x++)                 {                     InfoHolder hNow = ih[x];                     Console.WriteLine("FirstVar = {0} and SecondVar = {1}", hNow.FirstVar, hNow.SecondVar);                 }             }             ih.Sort(delegate(InfoHolder ihnow1, InfoHolder ihnow2) { return ihnow1.FirstVar.CompareTo(ihnow2.FirstVar); }); //Note:  To sort in descending order, after Sort above,  call Reverse             {                 Console.WriteLine();                 Console.WriteLine("After sort:");                 for (int x = 0; x < ih.Count; x++)                 {                     InfoHolder hNow = ih[x];                     Console.WriteLine("FirstVar = {0} and SecondVar = {1}", hNow.FirstVar, hNow.SecondVar);                 }             }             Console.WriteLine("Done - hit enter to complete.");             Console.ReadLine();         }     }     public class InfoHolder     {         public int FirstVar;         public string SecondVar;         public InfoHolder(int firstVar, string secondVar)         {             FirstVar = firstVar;             SecondVar = secondVar;         }     } }