C# 新手做了 一个小实验 稍微改写一下，求高手指导下~万分感谢~~

Question

using System;
using System.Collections.Generic;
using System.Text; 
namespace SY3_2 {       
    class Card     
    {          
        private string title, author;    
        private int total;         
        public Card()          
        {               
            title = "";  
            author = "";     
            total = 0;         
        }            
        public Card(string title, string author, int total)  
        {             
            this.title = title;      
            this.author = author;     
            this.total = total;        
        }           
        public void store(ref Card card)//使用ref关键字进行引用传递,似乎是它的拷贝构造     
        {              
            title = card.title;        
            author = card.author;     
            total = card.total;        
        }          
        public void show()      
        {            
            Console.WriteLine("Title:{0},Author:{1},Total:{2}", title, author, total);    
        }           
        public string Title//Title的属性可读可写       
        {           
            get { return title; }    
            set { title = value; }    
        }
         public string Author    
         {           
             get { return author; }         
             set { author = value; }     
         }           
        public string Total     
        {            
            get { return Total; }     
            set { total = int.Parse (value); } 
        }     
    }       
    public class Test3_2    
    {         
        static void Main(string[] args)   
        {              
            Test3_2 T = new Test3_2();      
            Card[] books;            
            int[] index;           
            int i, k;        
            Card card = new Card();  
            Console.Write("请输入需要入库图书的总数：");      
            string sline = Console.ReadLine();            
            int num = int.Parse(sline);              
            books = new Card[num];            
            for (i = 0; i < num; i++)           
                books [i]= new Card();          
            index = new int[num];         
            for (i = 0; i < num; i++)       
            {                 
                Console.Write("请输入书名：");    
                card.Title = Console.ReadLine();    
                Console.Write("请输入作者：");        
                card.Author = Console.ReadLine();         
                Console.Write("请输入入库量：");         
                sline = Console.ReadLine();             
                card.Total = sline;              
                books[i].store(ref card);               
                index[i] = i;//应该表示第几本书        
            }           
            Console.Write("请选择按什么关键字排序（1.按书名，2.按作者，3.按入库量）"); 
             sline = Console.ReadLine();           
            int choice = int.Parse(sline); 
            switch (choice)          
            {                   
                case 1:          
                    T.sortTitle(books,index);    
                    break;               
                case  2:               
                    T.sortAuthor(books,index);       
                    break;           
                case 3:                  
                    T.sortTotal(books,index);    
                    break;                
            }              
            for (i = 0; i < num; i++)     
            {            
                k = index[i];       
                books [k].show();//和给出的程序不同           
            }              
            Console .Read (); 
        }           
        void sortTitle(Card[] book, int[] index)     
        {            
            int i, j, m, n, temp;    
            for (m = 0; m < index.Length - 1; m++)        
            {                 
                for (n = 0; n < index.Length- m - 1; n++)     
                {              
                    i = index[n];   
                    j = index[n + 1];         
                    if (string.Compare(book[i].Title, book[j].Title) > 0)     
                    {                    
                        temp = index[n];        
                        index[n] = index[n + 1];    
                        index[n + 1] = temp;   
                    }                  
                }              
            }         
        } 
         void sortAuthor(Card[] book, int[] index)    
         {           
             int i, j, m, n, temp;    
             for(m=0;m<index .Length -1;m++)    
                 for (n = 0; n < index.Length -m- 1; n++)      
                 {           
                     i = index[n];             
                     j = index[n + 1];      
                     if (string.Compare(book[i].Author, book[j].Author) > 0)      
                     {                         
                         temp = index[n];       
                         index[n] = index[n+ 1];       
                         index[n + 1] = temp;           
                     }                
                 }      
         }           
        void sortTotal(Card[] book, int[] index)    
        {             
            int i, j, m, n, temp;     
            for (m = 0; m < index.Length - 1; m++)          
                for (n = 0; n < index.Length - m - 1;n++ )   
                {                   
                    i = index[n];        
                    j = index[n + 1];          
                    if (int.Parse (book[i].Total) > int.Parse (book[j].Total))          
                    {                
                        temp = index[n]; 
                        index[n] = index[n + 1];   
                        index[n + 1] = temp;        
                    }             
                }         
        }    
    }    
} 
题目就是将三个方法
void sortTitle(Card[]book,int[]index)
void sortAuthor(Card[]book,int[]index)
void sortTotle(Card[]book,int[]index)
改写成一个方法sort(Card[]book,int[]index,int method),其中增加的参数method指示按照什么字段排序，求各位高手帮帮忙啊~~~

Answer 1

void sort(Card[]book,int[]index,int method)
{
    if(method=title)
    {
     sortTitle(book,index)
     }
     if(method=sortAuthor)
     {
    sortsortAuthor(book,index)
      }
   if(method=Totle)
    {
    sortTotle(book,index)
     }
}

Answer 2

sortTitle
sortAuthor
sortTotle
三个方法堆砌了很多重复的代码，这还不说，如果想再来个sortXXX，又得复制粘贴出很多重复代码了。这时候，该是你用委托的时候了。

Answer 3

本帖最后由 caozhy 于 2012-11-18 02:45:24 编辑