集合是C#中一个重要的概念，下面给出一个集合拷贝的例子。

using System;using System.Collections;using System.Collections.Specialized;

namespace 集合的拷贝{/// <summary>/// Class1 的摘要说明。/// </summary>class Class1{[STAThread]static void Main(string[] args){NameValueCollection namedVColl=new NameValueCollection();namedVColl.Add("晓华","13510532686");namedVColl.Add("晓华","62658888");namedVColl.Add("小杨","1361030486");namedVColl.Add("小杨","62293218");foreach(string key in namedVColl.Keys)Console.WriteLine("姓名={0}，电话={1}",key,namedVColl[key]);Console.WriteLine("拷贝后获得的命名值集合");string[] arr=new string[namedVColl.Count];namedVColl.CopyTo(arr,0);for(int i=arr.GetLowerBound(0);i<arr.GetUpperBound(0);i++){Console.WriteLine("姓名={0}，电话={1}",namedVColl.AllKeys[i],arr[i]);}Hashtable hhtable=new Hashtable();hhtable["晓华"]="北京";hhtable["小杨"]="南京";Console.WriteLine("克隆前哈希表");foreach(object key in hhtable.Keys)Console.WriteLine("姓名={0}，地址={1}",key,hhtable[key]);Hashtable hhCloned=(Hashtable)hhtable.Clone();hhtable["晓华"]="上海";Console.WriteLine("克隆修改初始化哈希表");foreach(object key in hhtable.Keys) Console.WriteLine("姓名={0}，地址={1}",key,hhtable[key]);Console.WriteLine("修改后初始化哈希表后的克隆哈萨克希表");foreach(object key in hhCloned.Keys){Console.WriteLine("姓名={0}，地址={1}",key,hhCloned[key]);}Console.Read();}}}