asp.net使用反射出现的错误 我模仿PetShop4.0的多层结构写了一个程序,可为什么当我修改了其中的工程文件,比如增加了一个接口之类的,重新编译的时候,老是说我出现了诸如"无法将类型为“PetShop.SQLServerDAL.Product”的对象强制转换为类型“PetShop.IDAL.IProduct”。 "这样的错误,是不是dll的问题,需要手动更新吧,不过我想应该不是这个问题吧,请高手指点下,最近被这反射一类的错误搞得头都大了。 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 PetShop.SQLServerDAL.Product和接口PetShop.IDAL.IProduct有什么关系? PetShop.SQLServerDAL.Product是实现接口PetShop.IDAL.IProduct的类啊 namespace PetShop.DALFactory{ public class DataAccess { private static readonly string path = ConfigurationManager.AppSettings["WebDAL"]; private DataAccess() { } public static PetShop.IDAL.ICatalog CreateCatalog() { string className = path + ".Catalog"; return (PetShop.IDAL.ICatalog)Assembly.Load(path).CreateInstance(className); } public static PetShop.IDAL.IProduct CreateProduct() { string className = path + ".Product"; return (PetShop.IDAL.IProduct)Assembly.Load(path).CreateInstance(className); } }}--------------------------------------------------------------------------------------------namespace PetShop.IDAL{ public interface IProduct { IList<ProductInfo> GetProductsOnCatalogPromotion(int PageNumber,out int HowManyPages); }}---------------------------------------------------------------------------------------------namespace PetShop.SQLServerDAL{ public class Product { private static readonly string ProductDescriptionLength = ConfigurationManager.AppSettings["ProductDescriptionLength"].ToString(); private static readonly string ProductsPerPage = ConfigurationManager.AppSettings["ProductsPerPage"].ToString(); public IList<ProductInfo> GetProductsOnCatalogPromotion(int PageNumber, out int HowManyPages) { ....... } }}----------------------------------------------------------------------------------------------错误如下:无法将类型为“PetShop.SQLServerDAL.Product”的对象强制转换为类型“PetShop.IDAL.IProduct 哪里实现了接口? public class Product 后面没东西了?:PetShop.IDAL.IProduct 如何将Sql Server中取出来的数据控制精度? 有一个网页有一个特效,如何实现的,能谈一下代码么? GridView1_RowDataBound什么时候被调用 批量上传图片 关于URL重写的问题(刚研究,应该不难) 根据IP自动转向的数据库~? 无法在web服务器上启动调试 此项目在使用一个被配置为使用特定IP地址的网站 如何获得本地某网站的所有Cookie ? 关于customErrors 的配置 如何读取下一条记录? vs.net 2005在XP系统下面装不了,报2349的错误信息 关于ASP.NET 2.0中页面用户登录的问题,如何设置才好
{
public class DataAccess
{
private static readonly string path = ConfigurationManager.AppSettings["WebDAL"];
private DataAccess() { }
public static PetShop.IDAL.ICatalog CreateCatalog()
{
string className = path + ".Catalog";
return (PetShop.IDAL.ICatalog)Assembly.Load(path).CreateInstance(className);
}
public static PetShop.IDAL.IProduct CreateProduct()
{
string className = path + ".Product";
return (PetShop.IDAL.IProduct)Assembly.Load(path).CreateInstance(className);
}
}
}
--------------------------------------------------------------------------------------------
namespace PetShop.IDAL
{
public interface IProduct
{
IList<ProductInfo> GetProductsOnCatalogPromotion(int PageNumber,out int HowManyPages);
}
}
---------------------------------------------------------------------------------------------
namespace PetShop.SQLServerDAL
{
public class Product
{
private static readonly string ProductDescriptionLength = ConfigurationManager.AppSettings["ProductDescriptionLength"].ToString();
private static readonly string ProductsPerPage = ConfigurationManager.AppSettings["ProductsPerPage"].ToString();
public IList<ProductInfo> GetProductsOnCatalogPromotion(int PageNumber, out int HowManyPages)
{
.......
}
}
}
----------------------------------------------------------------------------------------------
错误如下:无法将类型为“PetShop.SQLServerDAL.Product”的对象强制转换为类型“PetShop.IDAL.IProduct
public class Product 后面没东西了?:PetShop.IDAL.IProduct