validation - 根据属性有条件地要求类中的所有字段

Question

我有一个 Address 类，它用于两个属性 - MailingAddress 和 StreetAddress。

如何使 StreetAddress 成为必需而 MailingAddress 不是？

    public Address MailingAddress { get; set; }

    [Required(ErrorMessage = "Address, city, state, and zip code are required.")]
    public Address StreetAddress { get; set; }


 public class Address
    {
        [DisplayName("Address")]
        public string StreetAddress { get; set; }
        [DisplayName("City")]
        public string City { get; set; }
        [DisplayName("State")]     
        public string SelectedState { get; set; }
        [DataType(DataType.PostalCode)]
        [RegularExpression(@"^\d{5}$|^\d{5}-\d{4}$", ErrorMessage="The postal code should be in the format 00000 or 00000-0000")]
        [DisplayName("Zip")]
        public string Zip { get; set; }
    }

Answer 1

我会以不同的方式对待他们。我建议我们有两个不同的地址模型并将它们放入一个视图模型中。

让我们为您的Address类指定一些virtual关键字，以便我们可以覆盖类属性。

public class Address
{
    [DisplayName("Address")]
    public virtual string StreetAddress { get; set; }
    [DisplayName("City")]
    public virtual string City { get; set; }
    [DisplayName("State")]     
    public virtual string SelectedState { get; set; }
    [DataType(DataType.PostalCode)]
    [RegularExpression(@"^\d{5}$|^\d{5}-\d{4}$", ErrorMessage="The postal code should be in the format 00000 or 00000-0000")]
    [DisplayName("Zip")]
    public virtual string Zip { get; set; }
}

现在让我们创建一个继承我们的 Address 类的新模型。

public class MandatoryAddress : Address
{
    [Required]
    public override string StreetAddress { get; set; }
    [Required]
    public override string City { get; set; }
    [Required]
    public override string SelectedState { get; set; }
    [Required]
    public override string Zip { get; set; }
}

现在让我们创建我们的viewModel

public class MyFormViewModel
{
    public MandatoryAddress StreetAddress { get; set; }
    public Address MailingAddress { get; set; }
}

视图可能如下所示

@{
    ViewBag.Title = "My Sample Form";
}

@model TestApp.Models.MyFormViewModel

<h2>@ViewBag.Title</h2>

@using (Html.BeginForm())
{
    <fieldset>
        <legend>Street Address</legend>
        <div>
            @Html.LabelFor(x => x.StreetAddress.StreetAddress)
            @Html.EditorFor(x => x.StreetAddress.StreetAddress)
            @Html.ValidationMessageFor(x => x.StreetAddress.StreetAddress)
        </div>
        <div>
            @Html.LabelFor(x => x.StreetAddress.City)
            @Html.EditorFor(x => x.StreetAddress.City)
            @Html.ValidationMessageFor(x => x.StreetAddress.City)
        </div>
        <div>
            @Html.LabelFor(x => x.StreetAddress.SelectedState)
            @Html.EditorFor(x => x.StreetAddress.SelectedState)
            @Html.ValidationMessageFor(x => x.StreetAddress.SelectedState)
        </div>
        <div>
            @Html.LabelFor(x => x.StreetAddress.Zip)
            @Html.EditorFor(x => x.StreetAddress.Zip)
            @Html.ValidationMessageFor(x => x.StreetAddress.Zip)
        </div>
    </fieldset>
    <fieldset>
        <legend>Mailing Address</legend>
        <div>
            @Html.LabelFor(x => x.MailingAddress.StreetAddress)
            @Html.EditorFor(x => x.MailingAddress.StreetAddress)
            @Html.ValidationMessageFor(x => x.MailingAddress.StreetAddress)
        </div>
        <div>
            @Html.LabelFor(x => x.MailingAddress.City)
            @Html.EditorFor(x => x.MailingAddress.City)
            @Html.ValidationMessageFor(x => x.MailingAddress.City)
        </div>
        <div>
            @Html.LabelFor(x => x.MailingAddress.SelectedState)
            @Html.EditorFor(x => x.MailingAddress.SelectedState)
            @Html.ValidationMessageFor(x => x.MailingAddress.SelectedState)
        </div>
        <div>
            @Html.LabelFor(x => x.MailingAddress.Zip)
            @Html.EditorFor(x => x.MailingAddress.Zip)
            @Html.ValidationMessageFor(x => x.MailingAddress.Zip)
        </div>
    </fieldset>

    <div>
        <input type="submit" />
    </div>
}

控制器可能如下所示：

public class FormController : Controller
{
    //
    // GET: /Form/

    [HttpGet]
    public ActionResult Index()
    {
        MyFormViewModel viewModel = new MyFormViewModel();
        return View(viewModel);
    }

    [HttpPost]
    public ActionResult Index(MyFormViewModel viewModel)
    {
        return View(viewModel);
    }

}

奖励经验值：

另一种方法（更复杂但可以说“更好”）是创建您自己的自定义[Required]属性，您可以将其应用于类（即StreetAddress）。该属性必须遍历类的每个属性并应用一个[Required]属性。