From:    honda@luckstar.com.tw
Date:    2017-01-29
Subject: Collections.SortedList.txt

ref:
https://msdn.microsoft.com/en-us/library/system.collections.sortedlist(v=vs.110).aspx

SortedList Class
1. SortedList有Collection跟Generic兩種版本. 若要存放的元素相同, 則應優先使用Generic版本.
2. 可以Key或Index存取資料. Index的值會跟隨著key的順序變動.
3. 元素以DictionaryEnry型態存放.
4. Key不可為null. 不可重複.
5. Value可以為null. 
6. 因為需要維持排序, 因此效能比Hashtable差. 但是彈性較佳(因為可以以Key或Index存取資料)
7. Key跟Value都是Object型態.


----------
SortedList Class

using System;
using System.Collections;
public class SamplesSortedList  {

   public static void Main()  {

      // Creates and initializes a new SortedList.
      SortedList mySL = new SortedList();
       mySL.Add("Third", "!");
       mySL.Add("Second", "World");
       mySL.Add("First", "Hello");

      // Displays the properties and values of the SortedList.
      Console.WriteLine( "mySL" );
      Console.WriteLine( "  Count:    {0}", mySL.Count );
      Console.WriteLine( "  Capacity: {0}", mySL.Capacity );
      Console.WriteLine( "  Keys and Values:" );
      PrintKeysAndValues( mySL );
   }


   public static void PrintKeysAndValues( SortedList myList )  {
      Console.WriteLine( "\t-KEY-\t-VALUE-" );
      for ( int i = 0; i < myList.Count; i++ )  {
         Console.WriteLine( "\t{0}:\t{1}", myList.GetKey(i), myList.GetByIndex(i) );
      }
      Console.WriteLine();
   }
}
/*
This code produces the following output.

mySL
  Count:    3
  Capacity: 16
  Keys and Values:
    -KEY-    -VALUE-
    First:    Hello
    Second:    World
    Third:    !
*/