为什么 .NET Core Razor 页面会验证未按要求设置的控件？

Question

我遇到一个问题，我的页面模型中有一个来自域类的属性，并且有几个我不想验证的字段。那些需要验证的我已经用 [Required] 装饰，但是当我将不需要的字段保留为空时，ModelState 将这些字段显示为无效。

我希望有人能告诉我为什么会发生这种情况以及如何阻止它。

这是我的 PageModel 代码的一部分，我遇到问题的属性是 Application

public class RecordApplicationModel : PageModel
{
    [BindProperty]
    public Sponsor Sponsor1 { get; set; } = new Sponsor();
    [BindProperty]
    public Sponsor Sponsor2 { get; set; } = new Sponsor();
    [BindProperty]
    public Application Application { get; set; } = new Application();
    public List<Member> Members { get; set; } = new List<Member>();
    public List<SelectListItem> MemberList { get; set; } = new List<SelectListItem>();

这是 cshtml 文件

<div class="col-md-6">
                <table class="table style=width:40%">
                    <tr>
                        <td>First Name</td>
                        <td>
                            <input asp-for="Application.FirstName" type="text" name="FirstName" value="@Model.Application.FirstName" />
                            <span asp-validation-for="Application.FirstName" class="text-danger"></span>
                        </td>
                    </tr>
                    <tr>
                        <td>Last Name</td>
                        <td>
                            <input asp-for="Application.LastName" type="text" name="LastName" value="@Model.Application.LastName" />
                            <span asp-validation-for="Application.LastName" class="text-danger"></span>
                        </td>
                    </tr>
                    <tr>
                        <td>Address</td>
                        <td>
                            <input asp-for="Application.Address" type="text" name="Address" value="@Model.Application.Address" />
                            <span asp-validation-for="Application.Address" class="text-danger"></span>
                        </td>
                    </tr>
                    <tr>
                        <td>City</td>
                        <td>
                            <input asp-for="Application.City" type="text" name="City" value="@Model.Application.City" />
                            <span asp-validation-for="Application.City" class="text-danger"></span>
                        </td>
                    </tr>
                    <tr>
                        <td>Province</td>
                        <td>
                            <input asp-for="Application.Province" type="text" name="Province" value="@Model.Application.Province" />
                            <span asp-validation-for="Application.Province" class="text-danger"></span>
                        </td>
                    </tr>
                    <tr>
                        <td>Postal Code</td>
                        <td>
                            <input asp-for="Application.PostalCode" type="text" name="PostalCode" value="@Model.Application.PostalCode" />
                            <span asp-validation-for="Application.PostalCode" class="text-danger"></span>
                        </td>
                    </tr>
                    <tr>
                        <td>Phone</td>
                        <td>
                            <input asp-for="Application.Phone" type="text" name="Phone" value="@Model.Application.Phone" />
                            <span asp-validation-for="Application.Phone" class="text-danger"></span>
                        </td>
                    </tr>
                    <tr>
                        <td>Alternate Phone</td>
                        <td><input asp-for="Application.AlternatePhone" type="text" name="AlternativePhone" value="@Model.Application.AlternatePhone" /></td>
                    </tr>
                    <tr>
                        <td>Email</td>
                        <td>
                            <input asp-for="Application.Email" type="text" name="Email" value="@Model.Application.Email" />
                            <span asp-validation-for="Application.Email" class="text-danger"></span>
                        </td>
                    </tr>
                    <tr>
                        <td>Date Of Birth</td>
                            <td>
                                <input asp-for="Application.DateOfBirth" type="date" name="DateOfBirth" value="@Model.Application.DateOfBirth.ToString("MM/dd/yyyy")" />
                                <span asp-validation-for="Application.DateOfBirth" class="text-danger"></span>
                        </td>
                    </tr>
                    <tr>
                        <td>Occupation</td>
                        <td><input asp-for="Application.Occupation" type="text" name="Occupation" value="@Model.Application.Occupation" /></td>
                    </tr>
                </table>

这是我的域类

public class Application
{
    public int ApplicationId { get; set; }
    [Required(ErrorMessage = "Last name is required")]
    public string LastName { get; set; } = string.Empty;
    [Required(ErrorMessage = "First name is required")]
    public string FirstName { get; set; } = string.Empty;
    [Required(ErrorMessage = "Address is required")]
    public string Address { get; set; } = string.Empty;
    [Required(ErrorMessage = "City is required")]
    public string City { get; set; } = string.Empty;
    [Required(ErrorMessage = "Province is required")]
    public string Province { get; set; } = string.Empty;
    [Required(ErrorMessage = "Postal Code is required")]
    public string PostalCode { get; set; } = string.Empty;
    [Required(ErrorMessage = "Phone is required")]
    public string Phone { get; set; } = string.Empty;
    public string AlternatePhone { get; set; } = string.Empty;
    [Required(ErrorMessage = "Email is required")]
    public string Email { get; set; } = string.Empty;
    [Required(ErrorMessage = "Date of Birth is required")]
    public DateTime DateOfBirth { get; set; }
    public string Occupation { get; set; } = string.Empty;
    public string CompanyName { get; set; } = string.Empty;
    public string CompanyAddress { get; set; } = string.Empty;
    public string CompanyPostalCode { get; set; } = string.Empty;
    public string CompanyPhone { get; set; } = string.Empty;
    public int? StatusId { get; set; }
    public string StatusDesc { get; set; } = string.Empty;


    public MemberType MemberType { get; set; } = new MemberType();

    public List<Sponsor> Sponsors { get; set; } = new List<Sponsor>();
}