显示EF实体对象的详细错误信息db.Entry(entity).GetValidationR

 public class NewsDal
 {
 public static News Add(News entity)
 {
 using (CmsContext db = new CmsContext())
 {
 News news = new News();
 try
 {
 news = db.News.Add(entity);
 db.SaveChanges();
 }
 catch (Exception ex)
 {
 throw new Exception(ex.Message);
 }
 return news;
 }
 }
 }

 public class NewsDal
 {
 public static News Add(News entity)
 {
 using (CmsContext db = new CmsContext())
 {
 News news = new News();
 try
 {
 news = db.News.Add(entity);
 db.SaveChanges();
 }
 //catch (Exception ex)
 catch (DbEntityValidationException ex)
 {
 throw new Exception(ex.Message);
 }
 return news;
 }
 }
 }