学习三层结构，想用反射，结果单个文件里可以实现，拆成三个项目就出错，在web和DAL两个项目里都添加了BLL引用，下面是代码，还请多多指教！
namespace BLL
{
public class CarFactory
{
public static ICar BuildCar()
{
BLL.ICar myCar = null;
try
{
Type type = Type.GetType("DAL.Bus", true);
myCar = (ICar)Activator.CreateInstance(type);
}
catch (TypeLoadException e)
{
Console.WriteLine("Unknow Car. Exception: - {0}", e.Message);
}
return myCar;
}
public static void ui()
{
BLL.ICar myCar = BLL.CarFactory.BuildCar();
myCar.Say();
}
}
}
namespace BLL
{
public interface ICar
{
void Say();
}
}
namespace DAL
{
public class Bus : BLL.ICar
{
public void Say()
{
Console.WriteLine("I am a Bus");
}
}
}
namespace Web
{
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
BLL.CarFactory.ui();
}
}
}
应该是Type type = Type.GetType("DAL.Bus", true);这一句错误了，可是不知道怎么写？