Sorting

Sort (System.Comparison<T> comparison)

Sorts the elements in a list by making use of the System.Comparison<T> delegate

public delegate int Comparison <in T>(T x, T y) 

This delegate must return a signed integer that indicates if
-1 - if x is less than y
1 - if y is less than x
0 - if x equals y

System.Collections.Generic.List<string> mylist; 
mylist = new System.Collections.Generic.List<string>(); 
mylist.Add("hhh"); 
mylist.Add("bbb"); 
mylist.Add(""); 
mylist.Add(null); 
mylist.Add("aaa"); 
mylist.Add("kkk"); 
mylist.Sort(CompareMyItems); 

private static int CompareMyItems(string x, string y) 
{ 
   if (x==null) 
   { 
      if (y==null) { return 0; }   //both null 
      else { return 1; }    //y > null 
   } 
   else 
   { 
      if (y==null) { return 1; }   //x > null 
      else 
      { 
         int retval = x.Length.CompareTo(y.Length); 
         if (retval==0) { return x.CompareTo(y); 
         else { return retval; } 
      } 
   } 
}