当模型验证未通过时，获取未通过验证的属性

public static string GetInVliadMsg(System.Web.Mvc.ModelStateDictionary modelState)
        {
            StringBuilder sb = new StringBuilder();
            foreach (var key in modelState.Keys)
            {
                if (modelState[key].Errors.Count <= 0) continue;
                sb.AppendFormat("属性【{0}】错误", key);
                foreach (var modelError in modelState[key].Errors)
                {
                    sb.AppendLine(modelError.ErrorMessage);
                }
            }
            return sb.ToString();
        }