數組和集合類的主要差異：

數組需要聲明它所容納的元素的類型，而集合則不需要。原因：集合是以object的形式來存儲它所容納的元素的。

數組的實例具有固定的大小，不能隨意增大或縮小。而集合可根據需要動態改變大小。

數組可以是多維的，但集合是線性的。（集合可以嵌套，其元素可以是其他集合，這樣我們可以模擬一個多維數組，但是會影響程序的可讀性）。

下面是常用的五個集合類的示例{（ArrayList、Queue、Stack、Hashtable、SortedList)，（引自Visual C#2008 從入門到精通）：

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C# Code:

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1?using?System;
2?using?System.Collections.Generic;
3?using?System.Linq;
4?using?System.Text;
5?using?System.Collections;

?

namespace?AssembleClass
{
????class?Program
????{
????????static?void?Main(string[]?args)
????????{


????????????//ArrayList
????????????/**//*ArrayList?numbers?=?new?ArrayList();
????????????foreach?(int?number?in?new?int[12]?{?10,?9,?8,?7,?7,?6,?5,?10,?4,?3,?2,?1?})
????????????{
????????????????numbers.Add(number);


????????????}
????????????numbers.Insert(numbers.Count?-?1,?99);

????????????numbers.Remove(7);
????????????numbers.RemoveAt(6);

????????????for?(int?i?=?0;?i?<?numbers.Count;?i++)
????????????{
????????????????int?number?=?(int)numbers[i];
????????????????Console.WriteLine(number);

????????????}

????????????foreach?(int?number?in?numbers)?
????????????{
????????????????Console.WriteLine(number);

????????????}*/



????????????//Queue
????????????/**//*Queue?numbers?=?new?Queue();

????????????foreach(int?number?in?new?int[4]{9,3,7,2})
????????????{
????????????????numbers.Enqueue(number);
????????????????Console.WriteLine(number+"?has?joined?the?queue");

????????????}

????????????foreach(int?number?in?numbers)
????????????{
???????????????Console.WriteLine(number);

????????????}

????????????while(numbers.Count>0)
????????????{
????????????????int?number?=(int)numbers.Dequeue();
????????????????Console.WriteLine(number+"?has?left?the?queue");

????????????}*/



????????????//Stack
????????????/**//*Stack?numbers?=?new?Stack();

????????????foreach(int?number?in?new?int[4]?{9,3,7,2})
????????????{
????????????????numbers.Push(number);
????????????????Console.WriteLine(number+"?has?been?pushed?on?the?stack");


????????????}

????????????foreach?(int?number?in?numbers)
????????????{
????????????????Console.WriteLine(number);
????????????????
????????????}

????????????while?(numbers.Count>0)
????????????{
????????????????int?number=(int)numbers.Pop();
????????????????Console.WriteLine(number+"?has?been?popped?off?the?stack");

????????????}*/


????????????//Hashtable
????????????/**//*Hashtable?ages?=?new?Hashtable();
????????????ages["John"]?=?42;
????????????ages["Diana"]?=?43;
????????????ages["James"]?=?15;
????????????ages["Francesca"]?=?13;

????????????foreach?(DictionaryEntry?element?in?ages)
????????????{
????????????????string?name?=?(string)element.Key;
????????????????int?age?=?(int)element.Value;
????????????????Console.WriteLine("Name:{0},Age:{1}",name,age);

????????????}*/

????????????//SortedList
????????????SortedList?ages?=new?SortedList();

????????????ages["John"]?=?42;
????????????ages["Diana"]?=?43;
????????????ages["James"]?=?15;
????????????ages["Francesca"]?=?13;

????????????foreach?(DictionaryEntry?element?in?ages)
????????????{
????????????????string?name?=?(string)element.Key;
????????????????int?age?=?(int)element.Value;
????????????????Console.WriteLine("Name:{0},age:{1}",?name,?age);

????????????}


????????}



????}
???
}

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轉載于:https://www.cnblogs.com/gb2013/archive/2009/04/15/1436542.html

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