反射

            //dlln名称无后缀，从当前目录加载
            Assembly assembly = Assembly.Load("DAL");
            //加载指定路径下的程序集
            Assembly assembly1 = Assembly.LoadFile(@"C:UsersAdministratorDesktopc#C#7.0核心技术CSharp核心技术7DALinDebugDAL.dll");
            //根据程序集名称或者完整路径加载程序集
            Assembly assembly2 = Assembly.LoadFrom("DAL.dll");