设计模式--简单工厂

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简单的说，就是通过工厂创建对象，然后客户端进行调用

1.声明接口

namespace ConsoleApplication1{    public interface IRace    {        void ShowKing();    }}

2.实现接口

namespace ConsoleApplication1{    public class Human : IRace    {        public void ShowKing()        {            Console.WriteLine(" this is Human ShowKing");        }    }}

namespace ConsoleApplication1{    public class NE : IRace    {        public void ShowKing()        {            Console.WriteLine(" this is NE ShowKing");        }    }}

namespace ConsoleApplication1{    public class Orc : IRace    {        public void ShowKing()        {            Console.WriteLine(" this is Orc ShowKing");        }    }}

3.Factory ,三种创建对象的方式

namespace ConsoleApplication1{    public class Factory    {        /// <summary>        /// 第一种创建        /// </summary>        /// <param name="raceType"></param>        /// <returns></returns>        public static IRace CreateInstance(RaceType raceType)        {            switch (raceType)            {                case RaceType.Human:                    return new Human();                case RaceType.OrC:                    return new Orc();                case RaceType.NE:                    return new NE();                default:                    throw new Exception("创建失败！");            }        }        private static string RaceTypeConfig = System.Configuration.ConfigurationManager.AppSettings["RaceTypeConfig"];        /// <summary>        /// 第二种通过配置文件创建实例        /// </summary>        /// <param name="raceType"></param>        /// <returns></returns>        public static IRace CreateInstanceConfig()        {            RaceType raceType = (RaceType)Enum.Parse(typeof(RaceType), RaceTypeConfig);            switch (raceType)            {                case RaceType.Human:                    return new Human();                case RaceType.OrC:                    return new Orc();                case RaceType.NE:                    return new NE();                default:                    throw new Exception("创建失败！");            }        }        private static string RaceTypeReflect = System.Configuration.ConfigurationManager.AppSettings["RaceTypeReflect"];        /// <summary>        /// 第三种通过反射创建实例，可扩展性极强        /// </summary>        /// <param name="raceType"></param>        /// <returns></returns>        public static IRace CreateInstanceReflect()        {            string assemblyName = RaceTypeReflect.Split(',')[0];            string typeName = RaceTypeReflect.Split(',')[1];            return (IRace)Activator.CreateInstance(assemblyName, typeName).Unwrap();        }    }    public enum RaceType    {        Human,        OrC,        NE    }}

4.App.config

<?xml version="1.0" encoding="utf-8" ?><configuration>  <startup>    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />  </startup>  <appSettings>    <!--靠配置文件改变生成的类 value 的值是具体的类 -->    <add key="RaceTypeConfig" value="Human"/>    <!--靠反射生成的对应的类 value 的值是具体的类 -->    <!--<add key="RaceTypeReflect" value="ConsoleApplication1,ConsoleApplication1.NE"/>-->    <!--靠反射生成的对应的类 value 的值是具体的类 -->    <add key="RaceTypeReflect" value="TheFive,TheFive.Five"/>  </appSettings></configuration>

5.client 调用

    public class Program    {        static void Main(string[] args)        {            IRace irace1 = Factory.CreateInstance(RaceType.Human);            irace1.ShowKing();            IRace irace2 = Factory.CreateInstance(RaceType.OrC);            irace2.ShowKing();            IRace irace3 = Factory.CreateInstance(RaceType.NE);            irace3.ShowKing();            Console.WriteLine("***********CreateInstanceConfig******************");            IRace irace4 = Factory.CreateInstanceConfig();            irace4.ShowKing();            Console.WriteLine("***********CreateInstanceReflect******************");            IRace irace5 = Factory.CreateInstanceReflect();            irace5.ShowKing();            Console.ReadKey();        }

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