显示EF实体对象的详细错误信息 db.Entry(entity).GetValidationResult() 或 catch (DbEntityValidationException ex)

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方法一：在快速监视中查看db.Entry(entity).GetValidationResult()

    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;}}}

快速监视中查看：db.Entry(entity).GetValidationResult() 

方法二：直接catch (DbEntityValidationException ex) 前提先引用：using System.Data.Entity.Validation;

    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;}}}

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