EntityFramework 数据校验异常处理

 public void Insert(PageHost entity)
 {
     try
     {
         db.pagehost.Add(entity);
         db.SaveChanges();
     }
     catch (DbEntityValidationException ep)
     {
         CatchException(ep);
     }
     catch (Exception ep)
     {
         throw ep;
     }
 }

 private void CatchException(DbEntityValidationException ep)
 {
     StringBuilder sb = new StringBuilder();
     foreach (DbEntityValidationResult item in ep.EntityValidationErrors)
     {
         foreach (string pp in item.Entry.OriginalValues.PropertyNames)
         {
             sb.AppendLine(item.Entry.Member(pp).CurrentValue.ToString());
         }
         foreach (DbValidationError i in item.ValidationErrors)
         {
             throw new Exception(string.Format("{0}\t{1}\t{2}", i.PropertyName, i.ErrorMessage, sb.ToString()));
         }
     }
 }