CheckBoxList不更新模型

Question

我定义了一个 Person 实体：

public partial class Person
{
 public string persID { get; set; }
 public string last_name { get; set; }
 public string driving_licence { get; set; }
}

其中驾驶执照如下：

public class DrivingLicence
    { 
        public string drivingLicenceValue { get; set; }
        public string drivingLicenceText { get; set; }

        public DrivingLicence(string paValue, string paText)
        {
            drivingLicenceValue = paValue;
            drivingLicenceText = paText;
        }
    }

有一个存储库，其中定义了此功能：

public List<DrivingLicence> GetAll()
{
        try
        {
            var drivingLicenceList = new List<DrivingLicence>();

            DrivingLicence oneDrivingLicence = new DrivingLicence("A", "A");
            drivingLicenceList.Add(oneDrivingLicence );

            oneDrivingLicence = new DrivingLicence("B", "B");
            drivingLicenceList.Add(oneDrivingLicence );


            oneDrivingLicence = new DrivingLicence("C", "C");
            drivingLicenceList.Add(oneDrivingLicence );

            oneDrivingLicence = new DrivingLicence("D", "D");
            drivingLicenceList.Add(oneDrivingLicence );

            return drivingLicenceList;
        }
        catch (Exception)
        {
            throw new Exception("An error occured. Failed to Get the list.");
        }
    }

现在：我希望驾驶执照显示为 CheckBoxList 并在提交时我希望为该人分配已检查的驾驶执照类别，例如：选择“A”和“C”类别，则生成的 person.driven_licence 必须为“AC”。

问题是这不会发生，该人已创建，但 Driving_licence 属性为空。我注意到复选框名称与相应属性（Person.driven_licence）的名称相同。

当前代码中存在错误吗？或者我应该修改 Person 实体？ 谢谢您的建议。

这是视图模型：

public class PersonFormViewModel
{
    // Properties
    public Person person { get; set; }
    public SelectList DrivingLicenceList { get; set; }
    public string ActionToPerform { get; set; }


    public PersonFormViewModel() { }

    // Constructor
    public PersonFormViewModel(Person pPerson, SelectList pDrivingLicenceList)
    {
        person= pPerson;
        DrivingLicenceList = pDrivingLicenceList;
        if (String.IsNullOrEmpty(person.persID))
        {
            ActionToPerform = "Create";
        }
        else
        {
            ActionToPerform = "Edit";
        }
    }
}

控制器：

    //
    // GET: /Person/Create
    [Authorize]
    public ActionResult Create()
    {
        Person person = new Person();
        SelectList drvLicenceList = new SelectList(drvLicenceRepository.GetAll(), "drivingLicenceValue", "drivingLicenceText");
        return View("Create", new PersonFormViewModel(person, drvLicenceList));
    }

    //
    // POST: /Person/Create

    [HttpPost, Authorize]
    public ActionResult Create(PersonFormViewModel model)
    {
         Person person = model.person;
         SelectList drvLicenceList = new SelectList(drvLicenceRepository.GetAll(), "drivingLicenceValue", "drivingLicenceText");

        if (ModelState.IsValid)
        {
            try
            {
                db.Entry(person).State = EntityState.Added;
                db.SaveChanges();
                return RedirectToAction("Details");
            }
            catch (...)
            {
                ...
            }
        }
        return View("Create", new PersonFormViewModel(person, drvLicenceList));
    }

和视图：

@model MyApp.ViewModels.PersonFormViewModel
@{
    ViewBag.Title = "Create";
}

@using (Html.BeginForm())
{

    @Html.ValidationSummary(false, "Errors occured.")
    <fieldset>
        <legend>Fill in your details</legend>
        @Html.LabelFor(model => model.person.last_name)
        @Html.TextBoxFor(model => model.person.last_name)
        @Html.ValidationMessageFor(model => model.person.last_name, "*")
        @Html.HiddenFor(model => model.person.persID)

        @foreach (var ctg in (Model.DrivingLicenceList))
         {
             <input type="checkbox" name="driving_licence" value=ctg.value />@ctg.Text
         }
        <input type="submit" value="Sauvegarder" class="submit" />
    </fieldset>
}

Answer 1

我将使用集合属性来存储选定的驾驶执照类别（可以选择多个复选框=>集合）：

public partial class Person
{
    public string persID { get; set; }
    public string last_name { get; set; }
    public string[] driving_licence { get; set; }
}

然后您将需要修复复选框的名称以使其正确绑定：

@foreach (var ctg in Model.DrivingLicenceList)
{
    <input type="checkbox" name="person.driving_licence" value="@ctg.Value" />
    @ctg.Text
}

并且如果您想要保留选定的值，您需要相应地设置选中的属性：

@foreach (var ctg in Model.DrivingLicenceList)
{
    <input type="checkbox" name="person.driving_licence" value="@ctg.Value" @((Model.person.driving_licence ?? Enumerable.Empty<string>()).Contains(ctg.Value) ? "checked=\"checked\"" : "") />
    @ctg.Text
}

话虽这么说，我们现在有了一个可行的解决方案，但它远非我所满意的，并就此停止。从现在开始，我们可以开始重构这一混乱局面，以符合 C# 命名约定（例如属性名称以大写字母开头，...），引入真实视图模型（不引用域模型）、自定义 HTML 帮助程序生成此复选框列表以避免在视图中写入循环和硬编码复选框，...