二.下面讲述6种常用集合
1.ArrayList类
using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
ArrayList al = new ArrayList();
al.Add(100);//单个添加
foreach (int number in new int[6] { 9, 3, 7, 2, 4, 8 })
{
al.Add(number);//集体添加方法一//清清月儿 http://blog.csdn.net/21aspnet/
}
int[] number2 = new int[2] { 11,12 };
al.AddRange(number2);//集体添加方法二
al.Remove(3);//移除值为3的
al.RemoveAt(3);//移除第3个
ArrayList al2 = new ArrayList(al.GetRange(1, 3));//新ArrayList只取旧ArrayList一部份
Console.WriteLine("遍历方法一:");
foreach (int i in al)//不要强制转换
{
Console.WriteLine(i);//遍历方法一
}
Console.WriteLine("遍历方法二:");
for (int i = 0; i != al2.Count; i++)//数组是length
{
int number = (int)al2[i];//一定要强制转换
Console.WriteLine(number);//遍历方法二
}
}
}
}
2.Stack类
栈，后进先出。push方法入栈，pop方法出栈。
using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
Stack sk = new Stack();
Stack sk2 = new Stack();
foreach (int i in new int[4] { 1, 2, 3, 4 })
{
sk.Push(i);//填充
sk2.Push(i);
}
foreach (int i in sk)
{
Console.WriteLine(i);//遍历
}
sk.Pop();
Console.WriteLine("Pop");
foreach (int i in sk)
{
Console.WriteLine(i);
}
sk2.Peek();//弹出最后一项不删除//清清月儿 http://blog.csdn.net/21aspnet/
Console.WriteLine("Peek");
foreach (int i in sk2)
{
Console.WriteLine(i);
}
while (sk2.Count != 0)
{
int i = (int)sk2.Pop();//清空
sk2.Pop();//清空
}
Console.WriteLine("清空");
foreach (int i in sk2)
{
Console.WriteLine(i);
}
}
}
}
3.Queue类
队列，先进先出。enqueue方法入队列，dequeue方法出队列。
using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
Queue qu = new Queue();
Queue qu2 = new Queue();
foreach (int i in new int[4] { 1, 2, 3, 4 })
{
qu.Enqueue(i);//填充
qu2.Enqueue(i);
}
foreach (int i in qu)
{
Console.WriteLine(i);//遍历
}
qu.Dequeue();
Console.WriteLine("Dequeue");
foreach (int i in qu)
{
Console.WriteLine(i);
}
qu2.Peek();//弹出最后一项不删除
Console.WriteLine("Peek");
foreach (int i in qu2)
{
Console.WriteLine(i);
}
while (qu2.Count != 0)
{
int i = (int)qu2.Dequeue();//清空
qu2.Dequeue();//清空
}
Console.WriteLine("清空");
foreach (int i in qu2)
{
Console.WriteLine(i);
}
}
}
}
4.Hashtable类
哈希表，名-值对。类似于字典(比数组更强大)。哈希表是经过优化的，访问下标的对象先散列过。如果以任意类型键值访问其中元素会快于其他集合。GetHashCode()方法返回一个int型数据，使用这个键的值生成该int型数据。哈希表获取这个值最后返回一个索引，表示带有给定散列的数据项在字典中存储的位置。
using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
namespace ConsoleApplication1
{
class Program
{
public static void Main()
{
// Creates and initializes a new Hashtable.
Hashtable myHT = new Hashtable();
myHT.Add("one", "The");
myHT.Add("two", "quick");
myHT.Add("three", "brown");
myHT.Add("four", "fox");
// Displays the Hashtable.//清清月儿 http://blog.csdn.net/21aspnet/
Console.WriteLine("The Hashtable contains the following:");
PrintKeysAndValues(myHT);
}
public static void PrintKeysAndValues(Hashtable myHT)
{
foreach (string s in myHT.Keys)
Console.WriteLine(s);
Console.WriteLine(" -KEY- -VALUE-");
foreach (DictionaryEntry de in myHT)
Console.WriteLine(" {0}: {1}", de.Key, de.Value);
Console.WriteLine();
}
}
}
5.SortedList类
与哈希表类似，区别在于SortedList中的Key数组排好序的。
using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
namespace ConsoleApplication1
{
class Program
{
public static void Main()
{
SortedList sl = new SortedList();
sl["c"] = 41;
sl["a"] = 42;
sl["d"] = 11;
sl["b"] = 13;
foreach (DictionaryEntry element in sl)
{
string s = (string)element.Key;
int i = (int)element.Value;
Console.WriteLine("{0},{1}",s,i);
}
}
}
}
6.NameValueCollection类
官方给NameValueCollection定义为特殊集合一类，在System.Collections.Specialized下。
System.Collections.Specialized下还有HybridDicionary类，建议少于10个元素用HybridDicionary，当元素增加会自动转为HashTable。
System.Collections.Specialized下还有HybridDicionary类，字符串集合。
System.Collections.Specialized下还有其他类大家可以各取所需！
言归正转主要说NameValueCollection，HashTable 和 NameValueCollection很类似但是他们还是有区别的，HashTable 的KEY是唯一性，而NameValueCollection则不唯一！
using System;
using System.Collections.Generic;
using System.Collections;
using System.Collections.Specialized;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
System.Collections.Hashtable ht = new System.Collections.Hashtable();
ht.Add("DdpMDisplaySeq".Trim(), "Display Sequence".Trim());
ht.Add("DdpMNameChi".Trim(), "Name (Chinese)".Trim());
ht.Add("DdpMNameEng".Trim(), "Name (English)".Trim());
ht.Add("Comment".Trim(), "Comment".Trim());
ht.Add("DdpMMarketCode".Trim(), "Market Code".Trim());
foreach (object key in ht.Keys)
{
Console.WriteLine("{0}/{1} {2},{3}", key, ht[key], key.GetHashCode(), ht[key].GetHashCode());
}
Console.WriteLine(" ");//清清月儿 http://blog.csdn.net/21aspnet/
NameValueCollection myCol = new NameValueCollection();
myCol.Add("DdpMDisplaySeq".Trim(), "Display Sequence".Trim());
myCol.Add("DdpMNameChi".Trim(), "Name (Chinese)".Trim());
myCol.Add("DdpMNameChi".Trim(), "Name (English)".Trim());
myCol.Add("Comment".Trim(), "Comment".Trim());
myCol.Add("DdpMMarketCode".Trim(), "Market Code".Trim());
foreach (string key in myCol.Keys)
{
Console.WriteLine("{0}/{1} {2},{3}", key, myCol[key], key.GetHashCode(), myCol[key].GetHashCode());
}
}
}
}
