using System;using System.Collections;       public partial class _Default : System.Web.UI.Page    {        protected void Page_Load(object sender, EventArgs e)        {            Person scott = new Person("Scott", "Hanselman");            Person bill = new Person("Bill", "Evjen");            Person srini = new Person("Srinivasa", "Sivakumar");             //ArrayList 包含着Person对象,实际还包括Object对象,也就是Arraylist还包括其他类对象            //固，下面要进行强制转换系统才知道他是什么类型            ArrayList people = new ArrayList();            people.Add(scott);            people.Add(bill);            people.Add(srini);             Response.Write("<font color=blue>We used foreach.</font><BR/>");            foreach (Person p in people)            {                Response.Write(p.FullName + "<BR/>");            }             Response.Write("<font color=red>Sort...</font><BR/>");            people.Sort();             Response.Write("<font color=blue>We used foreach.</font><BR/>");            foreach (Person p in people)            {                Response.Write(p.FullName + "<BR/>");            }             //在数组people中索引            Person scott2 = new Person("Scott", "Hanselman");            int indexOfScott2 = people.IndexOf(scott2);            Response.Write("<font color=red>indexof " + indexOfScott2 + "</font><BR/>");             //对已排序的搜索            int indexOfEquivalentScott = people.BinarySearch(scott2);            Response.Write("<font color=red>BinarySearch " + indexOfEquivalentScott +            "</font><BR/>");             Response.Write("<font color=blue>We used a for loop.</font><BR/>");            for (int i = 0; i < people.Count; i++)            {                //将Arraylist对象people对象进行强制转换成Peoson                Response.Write(((Person)people[i]).FullName + "<BR/>");            }        }    } public class Person : IComparable{    string FirstName;    string LastName;     public Person(string first, string last)    {        FirstName = first;        LastName = last;    }     public string FullName    {        get        {            return FirstName + " " + LastName;        }    }     int IComparable.CompareTo(object obj)    {        //as 表示  后面接的是要转化成的   type,   比方说          //int   i   =   18;         //object   j   =   i   as   object;        //这样i就被从int类型隐含转换成一个object类型       // 也可以写成   object   j   =   (object)i;           //将object类型转化为类类型        Person p2 = obj as Person;        if (p2 == null) throw new ArgumentException("Object is not a Person!");         int lastNameResult = this.LastName.CompareTo(p2.LastName);         if (lastNameResult == 0)        {            int firstNameResult = this.FirstName.CompareTo(p2.FirstName);            return firstNameResult;        }        else        {            return lastNameResult;        }    } }

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