MVC 易忘备留

1.ModelState.AddModelError("ServerMessage", MessageHelper.Instance.GetMessage(code));
@Html.ValidationMessage("ServerMessage")

 

2.private Field<DateTime?> _ExpiredDate = new Field<DateTime?>();

如果是底层返回的数据，则应该判断_ExpiredDate == null

如果你是new, 则判断_ExpiredDate.value == null

此类型前台绑定时，需要判断_ExpiredDate.Value==null，而不是_ExpiredDate==null

而private DateTime? _ExpiredDate;

则是判断 _ExpiredDate == null