抽象工厂解耦

web.config中的配置

<!--抽象工厂创建对象的所需的参数-->

<appSettings>
    <add key="dalAssmeblyPath" value="Shop.DAL"/>
    <add key="nameSpace" value="Shop.DAL"/>

</appSettings>

AbstractFactory类中的代码

public static partial class AbstractFactory
    {
        private static string dalAssmeblyPath = ConfigurationManager.AppSettings["dalAssmeblyPath"];
        private static string nameSpace = ConfigurationManager.AppSettings["nameSpace"];
        public static Shop.IDAL.IBookType GetBookTypeDal()
        {
            string fillName = nameSpace + ".BookType";
            Assembly assembly = Assembly.Load(dalAssmeblyPath);
            return assembly.CreateInstance(fillName) as Shop.IDAL.IBookType;
        }
    }