HashTable的使用实例

using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;

namespace ConsoleApplication1
{
    class Class1
    {
        public static void Main()
        {
            // Create and initialize a new Hashtable.
            Hashtable table = new Hashtable();
            //Student Name, Grade
            table.Add("Jay", 100);
            table.Add("Brian", 87);
            table.Add("Rajesh", 92);
            table.Add("Bill", 76);
            table.Add("Brad", 84);
            table.Add("Kit", 91);
            table.Add("Vinaya", 80);
            table.Add("Lakshan", 87);

            // Display the properties and values of the Hashtable.   
            Console.WriteLine("Count: {0}", table.Count);
            PrintTable(table);

            Console.WriteLine();
            int g = (int)table["Jay"];
            Console.WriteLine("Jay's grade is: {0}", g);

            Console.WriteLine();
            PrintItems("All Names", table.Keys);

            Console.WriteLine();
            PrintItems("All Grades", table.Values);

        }
        public static void PrintTable(Hashtable myList)
        {
            Console.WriteLine("{0,-8} {1,-8}", "Name", "Grade");
            Console.WriteLine("{0,-8} {1,-8}", "----", "-----");
            foreach (DictionaryEntry e in myList)
            {
                Console.WriteLine("{0,-8} {1,-8}", e.Key, e.Value);
            }
        }
        public static void PrintItems(string title, IEnumerable myList)
        {
            Console.Write("{0}: ", title);
            StringBuilder sb = new StringBuilder();
            foreach (object o in myList)
            {
                sb.AppendFormat("{0}, ", o);
            }
            sb.Remove(sb.Length - 2, 2);
            Console.WriteLine(sb);
        }
    }
}