Sorting a List

Question

Hi. I have a List . MyObj has a attribute Called Name. I would like to sort the List i alpfabetical order on the Name attribute.. How do I do that? Best regards Peter

Alan · Answer

Do you really mean an attribute or do you mean a property called Name? If it's the latter then this approach should work (.NET 2.0 or later): using System; using System.Collections.Generic; class Program { static void Main() { List list = new List (); list.Add(new MyObj(Peter)); list.Add(new MyObj(Alan)); list.Add(new MyObj(Joe)); list.Add(new MyObj(Fred)); list.Sort(CompareByName); foreach(MyObj obj in list) { Console.WriteLine(obj.Name); } Console.ReadKey(); } static int CompareByName(MyObj obj1 MyObj obj2) { // compare names ignoring case return String.Compare(obj1.Name obj2.Name true); } } class MyObj { string name; public string Name { get { return name;} } public MyObj(string name) { this.name = name; } }

Ryan Alford · Answer

here is some sample code. I have a class that has a DateTime property that I wanted to sort by. 1. Your class will need to implement the IComparable interface... public class YourClassName : IComparable { } 2. You need to implement the IComparable method in your class. int IComparable . CompareTo ( object obj ) { YourClassName Compare = ( YourClassName ) obj ; int result = this . YourSortingProperty . CompareTo ( Compare . YourSortingProperty ); if ( result == 0 ) result = Compare . YourSortingProperty . CompareTo ( this . YourSortingProperty ); return result ; } 3. and the code to sort... List YourClassName > list = new List YourClassName >(); //populate your list list . Sort ();