简单工厂模式

using System;  
02.  
03.namespace NameFactory  
04.{  
05.    /// <summary>  
06.    /// Summary description for FirstFirst.  
07.    /// </summary>  
08.    public class FirstFirst : Namer  
09.    {  
10.        public FirstFirst(string name)  
11.        {  
12.            int i = name.IndexOf (" ");  
13.            if(i > 0) {  
14.                frName = name.Substring (0, i).Trim ();  
15.                lName = name.Substring (i + 1).Trim ();  
16.            }  
17.            else {  
18.                lName = name;  
19.                frName = "";  
20.            }  
21.        }  
22.    }  
23.}  

using System;  
02.  
03.namespace NameFactory  
04.{  
05.    /// <summary>  
06.    /// Summary description for LastFirst.  
07.    /// </summary>  
08.    public class LastFirst : Namer  
09.    {  
10.        public LastFirst(string name)       {  
11.            int i = name.IndexOf (",");  
12.            if(i > 0) {  
13.                lName = name.Substring (0, i);  
14.                frName = name.Substring (i + 1).Trim ();  
15.            }  
16.            else {  
17.                lName = name;  
18.                frName = "";  
19.            }  
20.        }  
21.    }  
22.}  

两个派生类中构造函数根据是不是有“，”来将名字中的姓和名分割开来，分别保存的对应的变量中。

然后我们就可以构建简单的工厂了，只需要检测逗号的存在，然后返回两个类中的一个就可以了。

using System;  
02.  
03.namespace NameFactory  
04.{  
05.    /// <summary>  
06.    /// Summary description for NameFactory.  
07.    /// </summary>  
08.    public class NameFactory    {  
09.        public NameFactory() {}  
10.  
11.        public Namer getName(string name) {  
12.            int i = name.IndexOf (",");  
13.            if(i > 0)  
14.                return new LastFirst (name);  
15.            else  
16.                return new FirstFirst (name);  
17.        }  
18.    }  
19.}