.NET 设计模式初探

工厂模式——设计模式初探
最近，正在抓紧时间看.NET的视频，期末考试结束了，整个人也散了，找不到什么正经的事情干，没事就在实验室泡着，学习一下各方各面的知识，拓展一下思路和知识，感觉不错，呵呵。
下面是在听WebCast的设计模式的视频时，实现的例子，比较简单，具体对模式的理解和应用还很需要深入……
using System;
namespace CSDesignPattern
{
public enum UserType{Employee=0, Sales=1, Guest=2};//声明一个枚举，三种类型的用户
public class User
{
protected string level = "Z"; //权限级别
public string GetLevel() //得到该用户权限,默认为Z
{
return level;
}
}

public class Employee : User //继承,重新设定级别
{
public Employee()
{
level = "A";
}
}
public class Sales : User
{
public Sales()
{
level = "B";
}
}
public class Guest : User
{
public Guest()
{
level = "C";
}
}
public class FactoryCreator
{
public FactoryCreator(){}

public static User CreateUser(UserType userType) //根据用户类型初始化不同的用户
{
User u = null;
switch(userType)
{
case UserType.Employee:
u = new Employee();
break;
case UserType.Sales:
u = new Sales();
break;
case UserType.Guest:
u = new Guest();
break;
};
return u;
}
static void Main(string[] args)
{
Console.WriteLine("Input Type");
UserType t = (UserType)int.Parse(Console.ReadLine());
User newUser = FactoryCreator.CreateUser(t);
Console.WriteLine("Create an object:{0}" ,newUser.ToString());
Console.WriteLine("Level = {0}",newUser.GetLevel());
Console.ReadLine();
}
}
}