ASP.. NET MVC编辑数据库中的CheckBoxList值

我很难理解如何从数据库中的CustomerDevice表检索和编辑DevId值到基于CustId值的CheckBoxList。

CustomerDeviceController的My Index Action Method显示客户表中的客户列表。我有一个ActionLink标签"编辑"传递CustId值CustomerDeviceController [HttpGet]编辑(int?id)当前显示设备表中所有checkboxlisttitem值的动作方法。然而，CheckBoxList并没有将数据库中的CustomerDevice表中选中的DevId值显示到属于CustId的CheckBoxList中，而是显示对每个CheckBoxList值的检查。

部分，我有困难的理解和弄清楚，是我如何显示所选的DevId值从CustomerDevice表在我的数据库基于CustId的CheckBoxList，然后编辑/更新修改的CheckBoxListItems在[HttpPost]编辑动作方法回到我的CustomerDevice表在我的数据库中，如果需要的话。

请参阅下面的代码，我目前为止。

public class CheckBoxListItem
{
    public int ID { get; set; }
    public string Display { get; set; }
    public bool IsChecked { get; set; }
}
public class Customer
{
    public int CustId { get; set; }
    public string CustDisplayName { get; set; }
    public string CustFirstName { get; set; }
    ....
}
public class Device
{
    public int DevId { get; set; }
    public string DevType { get; set; }
}
public class CustomerDevice
{
    public int CustId { get; set; }
    public int DevId { get; set; }
    public Customer Customer { get; set; }
    public Device Device { get; set; }
}

视图模型

public class CustomerDeviceFormViewModel
{
    public int CustId { get; set; }
    public string CustDisplayName { get; set; }
    public List<CheckBoxListItem> Devices { get; set; }
}

CustomerDeviceController

public ActionResult Edit(int? id)
{
    if (id == null)
    {
        return NotFound();
    }
    var customervm = new CustomerDeviceFormViewModel();
    Customer customer = db.Customers.SingleOrDefault(c => c.CustId == id);
    if (customer == null)
    {
        return NotFound();
    }
    customervm.CustId = customer.CustId;
    customervm.CustDisplayName = customer.CustDisplayName;
    // Retrieves list of Devices for CheckBoxList
    var deviceList = db.Devices.ToList();
    var checkBoxListItems = new List<CheckBoxListItem>();
    foreach (var device in deviceList)
    {
        checkBoxListItems.Add(new CheckBoxListItem()
        {
            ID = device.DevId,
            Display = device.DevType,
            IsChecked = deviceList.Where(x => x.DevId == device.DevId).Any()
        });
    }
    customervm.Devices = checkBoxListItems;
    return View(customervm);
}
        [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Edit(CustomerDeviceFormViewModel vmEdit)
    {
        if (ModelState.IsValid)
        {
            Customer customer = db.Customers.SingleOrDefault(c => c.CustId == vmEdit.CustId);
            if (customer == null)
            {
                return NotFound();
            }
            foreach (var deviceId in vmEdit.Devices.Where(x => x.IsChecked).Select(x => x.ID))
            {
                var customerDevices = new CustomerDevice
                {
                    CustId = vmEdit.CustId,
                    DevId = deviceId
                };
                db.Entry(customerDevices).State = EntityState.Modified;
            }
            db.SaveChanges();
            return RedirectToAction("Index");
        }
        return View(vmEdit);
    }

Edit.chtml

<div class="form-group">
    Please select the Devices to assign to <b>@Html.DisplayFor(c => c.CustDisplayName)</b>
</div>
<div class="form-group">
    @Html.EditorFor(x => x.Devices)
</div>
@Html.HiddenFor(c => c.CustId)
<div class="form-group">
    <button type="submit" class="btn btn-primary">Submit</button>
</div>

共享/EditorTemplate CheckBoxListItem.chtml

<div class="checkbox">
<label>
    @Html.HiddenFor(x => x.ID)
    @Html.CheckBoxFor(x => x.IsChecked)
    @Html.LabelFor(x => x.IsChecked, Model.Display)
</label>
<br />