简单的工厂模式

Factory:工厂角色

Product:抽象产品角色

ConcreteProduct:具体产品角色

下面是一个支付方式的例子:(vs c#控制台)

 AbstractPay:抽象支付类

namespace SimpleFactoryModel
{
    abstract class AbstractPay
    {
        public abstract string pay(); //支付方式
    }
}

CashPay:现金支付类:

namespace SimpleFactoryModel
{
    class CashPay:AbstractPay
    {
        public override string pay()
        {
            //现金支付
            return "现金支付";
        }
    }
}

CardPay:刷卡支付类

namespace SimpleFactoryModel
{
    class CardPay:AbstractPay
    {
        public override string pay()
        {
             //刷卡支付
            return "刷卡支付";
        }
    }
}

MovePay:移动支付类

namespace SimpleFactoryModel
{
    class MovePay:AbstractPay
    {
        public override string pay()
        {
            //移动支付
            return "移动支付";
        }
    }
}

PayFactory:支付工厂

using System;
using System.Reflection;

namespace SimpleFactoryModel
{
    class PayFactory
    {
         string className= XMUntil.GetClassName();
         AbstractPay ap = null;
         public void pay()
         {
             switch (className)
             {
                 case "MovePay":
                     ap = new MovePay();
                     break;
                 case "CardPay":
                     ap = new CardPay();
                     break;
                 case "CashPay":
                     ap = new CashPay();
                     break;
                 default: ; break;
             }
             Console.WriteLine(ap.pay());
             Console.ReadKey();
             /*
             //通过反射将类名字符串转为同名类(进阶)
             Type t;
             t = Type.GetType("SimpleFactoryModel."+XMUntil.GetClassName());
             object obj = Activator.CreateInstance(t);
             AbstractPay ap = (AbstractPay)obj;
             Console.WriteLine(ap.pay());
             Console.ReadKey();
             */
         }
            
    }
}

config.xml：配置文件

<?xml version="1.0" encoding="utf-8" ?>
<config>
  <className>MovePay</className>
</config>

XMUntil：xml解析

using System;
using System.Xml;
namespace SimpleFactoryModel
{
    static class XMUntil
    {
        /// <summary>
        /// xml文件解析
        /// </summary>
        /// <returns></returns>  
        public static string GetClassName()
        {
            try
            {
                string path = AppDomain.CurrentDomain.BaseDirectory + "Config.xml";
                XmlDocument doc = new XmlDocument();
                doc.Load(path);
                XmlNode config = doc.SelectSingleNode("config");
                XmlNodeList className = config.ChildNodes;
                return className[0].InnerText;
            }
            catch (Exception)
            {          
                throw;
            }
           
        }
    }
}

Client:客户端

using System;
using System.Reflection;

namespace SimpleFactoryModel
{
    class Client
    {
        static void Main(string[] args)
        {

　　　　　　　　PayFactory factory = new PayFactory();
　　　　　　　　factory.pay();

        }
    }
}