老外编的程序（四）－－HashTable的使用示例

来源：作者：出处：巧巧读书 2006-09-18 进入讨论组

关键词：

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

public class SamplesHashtable {
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);
    }
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