先看下面的代码
using System;
using System.Collections;
namespace NoSortHashtable
{
/// <summary>
/// Summary description for Class1.
/// </summary>
class Class1
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main(string[] args)
{
Hashtable hashTable = new Hashtable();
hashTable.Add("hunan","changsha");
hashTable.Add("beijing","beijing");
hashTable.Add("anhui","hefei");
hashTable.Add("sichuan","chengdu");
foreach(string str in hashTable.Keys)
{
Console.WriteLine(str + " : " + hashTable[str]);
}
}
}
}
using System.Collections;
namespace NoSortHashtable
{
/// <summary>
/// Summary description for Class1.
/// </summary>
class Class1
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main(string[] args)
{
Hashtable hashTable = new Hashtable();
hashTable.Add("hunan","changsha");
hashTable.Add("beijing","beijing");
hashTable.Add("anhui","hefei");
hashTable.Add("sichuan","chengdu");
foreach(string str in hashTable.Keys)
{
Console.WriteLine(str + " : " + hashTable[str]);
}
}
}
}
打印的结果是:
anhui : hefei
hunan : changsha
sichuan : chengdu
beijing : beijing
当然,产生这个结果的原因大家都知道,Hashtable内部的排序机制使然,但我现在就是不想排序,我按什么顺序输入的,就想它再怎么给我输出,怎么办?去Google酷了一下,却因为不知道使用什么关键字去酷,结果没有酷出好的相关问题来。
我想到,ArrayList是不排序的啊,那是不是让ArrayList和Hastable配成良缘,那么它们的结晶就是我想要的呢,既有Hashtable的丰富功能,又可以满足我的BT的要求(不排序),动手了。
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再试
hashTable = new NoSortHashtable();
hashTable.Add("hunan","changsha");
hashTable.Add("beijing","beijing");
hashTable.Add("anhui","hefei");
hashTable.Add("sichuan","chengdu");
foreach(string str in hashTable.Keys)
{
Console.WriteLine(str + " : " + hashTable[str]);
}
hashTable.Add("hunan","changsha");
hashTable.Add("beijing","beijing");
hashTable.Add("anhui","hefei");
hashTable.Add("sichuan","chengdu");
foreach(string str in hashTable.Keys)
{
Console.WriteLine(str + " : " + hashTable[str]);
}
打印结果:
hunan : changsha
beijing : beijing
anhui : hefei
sichuan : chengdu