ModelState.IsValid 不断返回为假？

Question

所以我有一个视图，其中成员输入与他们关联的 PIN 码以打卡

@model Models.Member
@{
    Layout = "~/Views/Shared/_HomeLayout.cshtml";
}

<h1 style="margin-top: 0px;">Club Members Login Below!</h1> @*add this to the style for better ipad title -> "text-align: center;"*@
</br>
@using (Html.BeginForm("ClubHours", "Login", FormMethod.Post))
{
    @Html.LabelFor(c => c.PIN)
    @Html.TextBoxFor(c => c.PIN)<br />
    @Html.ValidationMessageFor(c => c.PIN)<br />

    <input type="submit" name="submit" value="ClockIn" />
    <input type="submit" name="submit" value="ClockOut" />
}

与此操作结果交互的：

[HttpPost]
public ActionResult ClubHours(string submit, Member member)//member clocking in
{
    if (submit.Equals("ClockIn"))
    {
        if (!ModelState.IsValid) //validating events fields
        {
            return View("UserLogin");
        }
        else
        {
            var mem = _context.Members.SingleOrDefault(c => c.PIN == member.PIN);
            var hours = new MemberClubHours();
            hours.ClockIn = DateTime.Now;
            mem.Hours.Add(hours);
            _context.SaveChanges();
            return View("ClockIn");
        }
    }
    else if (submit.Equals("ClockOut"))
    {
        if (!ModelState.IsValid) //validating events fields
        {
            return View("UserLogin");
        }
        else
        {
            var mem = _context.Members.SingleOrDefault(c => c.PIN == member.PIN);
            var hours = new MemberClubHours();
            hours.ClockOut = DateTime.Now;
            mem.Hours.Add(hours);
            _context.SaveChanges();
            return View("ClockOut");
        }
    }
    else
    {
        return View("UserLogin","Login");
    }
}

最后是成员类

public class Member
{
    public int Id { get; set; }
    [Required]
    [MaxLength(4, ErrorMessage = "PIN must be 4 numbers long"), MinLength(4, ErrorMessage = "PIN must be 4 numbers long")]
    public string PIN { get; set; }
    [Required]
    [Display(Name ="First Name")]
    public string FirstName { get; set; }
    [Required]
    [Display(Name = "Last Name")]
    public string LastName { get; set; }
    [Display(Name = "Date of Birth")]
    public DateTime? Birthdate { get; set; }
    public virtual ICollection<MemberClubHours> Hours { get; } = new HashSet<MemberClubHours>();
}

和 memberclubhours 课程

public class MemberClubHours
{
    public int Id { get; set; }
    public DateTime? ClockIn { get; set; }
    public DateTime? ClockOut { get; set; }
    [Required]
    public Member Member { get; set; }
}

代码可以正常工作，并且会跟踪成员的工作时间，但是我正在尝试实施验证，但即使我输入了与系统中的成员相关联的 PIN，它仍然无效？任何帮助将不胜感激！

Answer 1

您正在验证从前端发送的模型。不是数据库，您确定模型是根据模型中的数据注释填充的吗？

查看 ModelState 它是 asp.net core 3.1，但仍然相关

Answer 2

成员模型显示为无效，因为成员模型需要 Id、PIN、FirstName、LastName 字段。

您无法使用ModelState.IsValid 验证此类，因为它会检查所有属性--看起来您只是在传递 PIN 属性。

如果您不想为其创建视图模型，则可以将这些属性包含为隐藏的输入字段；

@using (Html.BeginForm("ClubHours", "Login", FormMethod.Post))
{
    @Html.HiddenFor(c=>c.Id)
    @Html.HiddenFor(c=>c.FirstName)
    @Html.HiddenFor(c=>c.LastName)

    @Html.LabelFor(c => c.PIN)
    @Html.TextBoxFor(c => c.PIN)<br />
    @Html.ValidationMessageFor(c => c.PIN)<br />

    <input type="submit" name="submit" value="ClockIn" />
    <input type="submit" name="submit" value="ClockOut" />
}