HashTable里面装的是对象 该如何遍历

Question

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
namespace CollectionDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            Student s1 = new Student();
            Student s2 = new Student();
            Teacher t1 = new Teacher();
            Teacher t2 = new Teacher();
            s1.Name = "dwyane";
            s1.Id = 1;
            s2.Name = "lebron";
            s2.Id = 2;
            t1.Name = "paul";
            t1.Id = 3;
            t2.Name = "kobe";
            t2.Id = 4;
/*
            ArrayList list = new ArrayList(5)
            list.Add(s1);
            list.Add(s2);
            list.Add(t1);
            list.Add(t2);
*/
            Hashtable map = new Hashtable();
            map.Add(1, s1);
            map.Add(2, s2);
            map.Add(3, t1);
            map.Add(4, t2);
            foreach (DictionaryEntry o in map)
            {                Console.ReadLine();
            }
        }
    }
}
怎么遍历输出名字和学号？

Answer 1

System.Collections.IDictionaryEnumerator enumerator = map.GetEnumerator(); 
while (enumerator.MoveNext())
{
    //Console.WriteLine(enumerator.Key);         // Hashtable关健字
    //Console.WriteLine(enumerator.Value);      // Hashtable值其实是一个Teacher对象
    Teacher t = (Teacher)enumerator.Value;
    Console.WriteLine(t.Name); 
    Console.WriteLine(t.Id); 
    Console.WriteLine("------"); 
}

Answer 2

大致思路如下，具体靠自己美观了using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
using ConsoleApplication1;namespace CollectionDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            Student s1 = new Student();
            Student s2 = new Student();
            Teacher t1 = new Teacher();
            Teacher t2 = new Teacher();
            s1.Name = "dwyane";
            s1.Id = 1;
            s2.Name = "lebron";
            s2.Id = 2;
            t1.Name = "paul";
            t1.Id = 3;
            t2.Name = "kobe";
            t2.Id = 4;
            /*
                        ArrayList list = new ArrayList(5)
                        list.Add(s1);
                        list.Add(s2);
                        list.Add(t1);
                        list.Add(t2);
            */
            Hashtable map = new Hashtable();
            map.Add(1, s1);
            map.Add(2, s2);
            map.Add(3, t1);
            map.Add(4, t2);            foreach (DictionaryEntry o in map)
            {
                if(o.Value is Teacher)
                {   
                    var teacher = o.Value as Teacher;
                    Console.WriteLine("{0}, {1}", teacher.Id, teacher.Name);
                }                if(o.Value is Student)
                {
                    var student = o.Value as Student;
                    Console.WriteLine("{0}, {1}", student.Id, student.Name);
                }
            }            Console.ReadLine();
        }
    }
}

Answer 3

为什么输出的顺序是倒过来的？
看你自己的o.Value是什么了呗

Answer 4

http://bbs.csdn.net/topics/30041530HashTable是无序的，如果你真在意顺序，直接用List吧
用之前转成Object，再加些判断逻辑或者按照下面的方法
http://hi.baidu.com/cool_bye/item/b81a0d1bb6ce45fb65eabfdd

Answer 5

把(Key, 对象)加到HashTabel;
变量1, 变量2;
遍历HashTable中的Key
{
  变量1 = Key对应的对象.学号;
  变量2 = Key对应的对象.姓名;
}

Answer 6

变量改为数组哈!
数组.Length = HashTable.Count;