使用接口排序(2)

using System;
using System.Collections;

public enum enuSortOrder
{IDAsc, IDDesc, RankAsc, RankDesc}

public class Person : IComparable
{
 public static enuSortOrder intSortOrder = enuSortOrder.IDAsc;

 public int ID;
 public string Rank;

 public Person(int id, string rank)
 { this.ID=id; this.Rank = rank; }

 #region IComparable Members

 /*
  * IComparable 接口只有一个方法: CompareTo。CompareTo方法
  * 只接收一个object类型的参数，这意味着它可以接收任何类
  * 型的数据（object是所有类的父类），这个方法会返回一
  * 整型数值，含义如下：
  *
  * 1) 小于零，当前实例（this）小于obj对象
  * 2) 等于零，当前实例（this）等于obj对象
  * 3) 大于零，当前实例（this）大于obj对象
  *
  * Int32,Int16...,String,Decimal等数据类型都已经实现了IComparable接口
  */
 public int CompareTo(object obj)
 {
  Person p = (Person)obj;
  switch ((int)intSortOrder)
  {
   case (int)enuSortOrder.IDAsc:
    return this.ID.CompareTo(p.ID);
   case (int)enuSortOrder.IDDesc:
    return p.ID.CompareTo(this.ID);
   case (int)enuSortOrder.RankAsc:
    return RankCompare(this.Rank, p.Rank);
   case (int)enuSortOrder.RankDesc:
    return RankCompare(p.Rank, this.Rank);
   default:
    return this.ID.CompareTo(p.ID);
  }
 }

 private int RankCompare(string rank1, string rank2)
 {
  int intRank1 = ConvertRankToInt(rank1);
  int intRank2 = ConvertRankToInt(rank2);
  if(intRank1 < intRank2)
   return -1;
  else if(intRank1 == intRank2)
   return 0;
  else
   return 1;
 }

 private int ConvertRankToInt(string rank)
 {
  if(rank == "司令")
   return 8;
  else if(rank == "军长")
   return 7;
  else if(rank == "师长")
   return 6;
  else if(rank == "旅长")
   return 5;
  else if(rank == "团长")
   return 4;
  else if(rank == "营长")
   return 3;
  else if(rank == "连长")
   return 2;
  else
   return 1;
 }

 #endregion
}

class SortArrayList
{
 static void Main(string[] args)
 {
  ArrayList list = new ArrayList();
  list.Add(new Person(6, "排长"));
  list.Add(new Person(3, "团长"));
  list.Add(new Person(4, "司令"));
  list.Add(new Person(5, "旅长"));
  list.Add(new Person(7, "连长"));
  list.Add(new Person(1, "军长"));
  list.Add(new Person(2, "营长"));
  list.Add(new Person(8, "师长"));

  list.Sort();
  Console.WriteLine("Sort By ID Asc:");
  foreach (Person person in list)
  {
   Console.WriteLine("ID: " + person.ID.ToString() + ", Rank: " + person.Rank);
  }

  Console.WriteLine("----------------------------");
  Console.WriteLine("Sort By ID Desc:");

  Person.intSortOrder = enuSortOrder.IDDesc;
  list.Sort();
  foreach (Person person in list)
  {
   Console.WriteLine("ID: " + person.ID.ToString() + ", Rank: " + person.Rank);
  }

  Console.WriteLine("----------------------------");
  Console.WriteLine("Sort By Rank Asc:");

  Person.intSortOrder = enuSortOrder.RankAsc;
  list.Sort();
  foreach (Person person in list)
  {
   Console.WriteLine("ID: " + person.ID.ToString() + ", Rank: " + person.Rank);
  }

  Console.WriteLine("----------------------------");
  Console.WriteLine("Sort By Rank Desc:");

  Person.intSortOrder = enuSortOrder.RankDesc;
  list.Sort();
  foreach (Person person in list)
  {
   Console.WriteLine("ID: " + person.ID.ToString() + ", Rank: " + person.Rank);
  }
 } 
}