SortedList Desc Order

Question

I am using SortedList to arrange arraylist records dynamically in sort order by datecolumn, but by default it is sorting in ascending order. I have been trying to get order in descending order but not able to get it.

Answer 1

Swapping y for x should do when comparing

class DescComparer<T> : IComparer<T> {     public int Compare(T x, T y)     {         if(x == null) return -1;         if(y == null) return 1;         return Comparer<T>.Default.Compare(y, x);     } } 

and then this

var list = new SortedList<DateTime, string>(new DescComparer<DateTime>()); 

Answer 2

There is no way to instruct the SortedList to do sorting in descended order. You have to provide your own Comparer like this

    class DescendedDateComparer : IComparer<DateTime>     {         public int Compare(DateTime x, DateTime y)         {             // use the default comparer to do the original comparison for datetimes             int ascendingResult = Comparer<DateTime>.Default.Compare(x, y);              // turn the result around             return 0 - ascendingResult;         }     }      static void Main(string[] args)     {         SortedList<DateTime, string> test = new SortedList<DateTime, string>(new DescendedDateComparer());     }