Factory中相关类的配置

/// <summary>
        /// 根据配置文件的不同加载不同的访问层
        /// </summary>
        private static readonly string path = System.Configuration.ConfigurationManager.AppSettings["DAL"];
        /// <summary>
        /// 无参数的构造函数
        /// </summary>
        private DataAccess() { }


        /// <summary>
        /// 工厂访问 BaddishIDAL 对象
        /// </summary>
        /// <returns>返回 BaddishIDAL 对象</returns>
        public static ErpIDAL.IBaddishIDAL CreateBaddishDAL()
        {
            string className = path + ".BaddishDAL";
            return Assembly.Load(path).CreateInstance(className) as ErpIDAL.IBaddishIDAL;
        }

在Web.config中的相关配置

 

<appSettings>
        <add key="DAL" value="ErpDAL"/>
    </appSettings>
    <connectionStrings>
    <add name="connectionString" connectionString="Data Source=.;Initial Catalog=dataBase;Persist Security Info=True;User ID=sa;Password=sa" />
 </connectionStrings>