获取EntityFrameWork返回的错误和ModelState中的错误

 1 string error = string.Empty;
 2 using (var blog = new Blog())
 3 {
 4     Author author = new Author
 5     {
 6         Name = "ErrorNameForTest"
 7     };
 8     blog.Authors.Add(author);
 9 
10     try
11     {
12         blog.SaveChanges();
13     }
14     catch (DbEntityValidationException ex)
15     {
16         foreach (var item in ex.EntityValidationErrors)
17         {
18         foreach (var item2 in item.ValidationErrors)
19         {
20             error = string.Format("{0}:{1}\r\n", item2.PropertyName, item2.ErrorMessage);
21         }
22         }
23     }
24 }
25 return error;

 1 代码
 2 [HttpPost]
 3         public ActionResult CreateComment(Comment comment)
 4         {
 5             if (!ModelState.IsValid)
 6             {
 7                 List<string> sb = new List<string>();
 8                 //获取所有错误的Key
 9                 List<string> Keys = ModelState.Keys.ToList();
10                 //获取每一个key对应的ModelStateDictionary
11                 foreach (var key in Keys)
12                 {
13                     var errors = ModelState[key].Errors.ToList();
14                     //将错误描述添加到sb中
15                     foreach (var error in errors)
16                     {
17                         sb.Add(error.ErrorMessage);
18                     }
19                 }
20                 return Json(sb);
21             }
22             else
23             {
24                 return Json(commentRepository.InsertComment(comment));
25             }
26         }