if (!ModelState.IsValid)         {            List<string> sb = new       List<string>();              //获取所有错误的Key              List<string> Keys = ModelState.Keys.ToList();              //获取每一个key对应的ModelStateDictionary                  foreach (var key in Keys)                {                   var errors = ModelState[key].Errors.ToList();                  //将错误描述添加到sb中                      foreach (var error in errors)                  {                       sb.Add(error.ErrorMessage);                }             }               return Json(sb);           }  

C# 错误捕捉