Question

目前，我在将Enum值保存到我的数据库时遇到问题，因为我没有正确地从ViewModel映射到我的Model，反之亦然。问题在于我尝试Edit现有的Delivery。它得到status，但当我尝试save时，它save status。{/ p>

此行delivery.status = model.Status;不起作用，我不知道是否应该在Enum中设置ViewModel。

我很难过，因为我不知道该怎么做。我仍然是一个初学者，所以我试图围绕这个发展，我能不能提出一个解决方案或指出我正确的方向？

查看型号：

public enum Status
{
    Dispatched, Delayed, Delivered
}
public class DeliveryVM
{
    public int? ID { get; set; }
    public int DriverID { get; set; }

    public Status Status { get; set; }
}

控制器：

public ActionResult Edit(int? id)
{
    ....
    Delivery delivery = db.Deliverys.Find(id);
    // Initialize the view model
    DeliveryVM model = new DeliveryVM()
    {
        ID = delivery.DeliveryID,
        DriverID = delivery.DriverID,
        Status = model.Status; // this doesn't work
    };
    return View(model);
}

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit(DeliveryVM model)
{

    // Get the data model based on the ID of the view model
    Delivery delivery = db.Deliverys.Find(model.ID);
    // Map the view model properties to the data model
    delivery.DriverID = model.DriverID;
    delivery.status = model.Status; // this doesn't work

   // Mark as modified and save
   ....
   return RedirectToAction("Details", new { id = delivery.DeliveryID });
}

型号：

public enum Status
{
   Dispatched, Delayed, Delivered
}
public class Delivery
{
    public int DeliveryID { get; set; }
    [Display(Name = "Driver")]
    public int DriverID { get; set; }
    public Status Status { get; set; }
}

查看代码：

            <div class="form-group">
                @Html.LabelFor(model => model.Status, htmlAttributes: new { @class = "control-label col-md-2" })
                <div class="col-md-10">
                    @Html.EnumDropDownListFor(model => model.Status, htmlAttributes: new { @class = "form-control", @id="dropdown" })
                    @Html.ValidationMessageFor(model => model.Status, "", new { @class = "text-danger" })
                </div>
            </div>

这是我在这一行delivery.status = model.Status;上遇到的错误：

Answer 1

如果您希望以最简单的方式使ViewModel Status属性成为字符串或int并映射到控制器中的Status或来自您的数据中，或者在您的数据中选择调用，如果您现在必须这样做。< / p>

如果这不是问题，因为我在您的视图中看不到您在做什么，在您的编辑操作方法中，您无法使用视图模型值更新delivery.Status，无论如何我可以看到..

Delivery delivery = db.Deliverys.Find(model.ID);
// Map the view model properties to the data model
delivery.DriverID = model.DriverID;
delivery.Dispatched_Date = model.Dispatched_Date;
delivery.Dispatched_Time = model.Dispatched_Time;
delivery.Delivered_Date = model.Delivered_Date;
delivery.Delivered_Time = model.Delivered_Time;
delivery.Delayed_Date = model.Delayed_Date;
delivery.Delayed_Time = model.Delayed_Time;
delivery.Comment = model.Comment;

//where is this?
delivery.Status = model.Status;//do a mapping from int or string if you change VM like i suggested

Answer 2

您已为enums声明了2个单独的Status，一个在数据模型的程序集中，另一个在视图模型的程序集中。它们是不同的类型，不能从一个转换为另一个。您可以让视图模型引用数据模型程序集中的enum Status，也可以使用Enum.TryParse()方法在它们之间进行映射，例如从GET中的数据模型映射到视图模型方法

HealthHabitat.ViewModels.Status status = HealthHabitat.ViewModels.Status.Dispatched;
Enum.TryParse(delivery.Status.ToString(), out status);
DeliveryVM model = new DeliveryVM()
{
    ID = delivery.DeliveryID,
    DriverID = delivery.DriverID,
    Status = status;
};

然后在POST方法中，反向执行

HealthHabitat.Models.Status status = HealthHabitat.Models.Status.Dispatched;
Enum.TryParse(model.Status.ToString(), out status);
delivery.Status = status;

如何将我的交付模型中的枚举交付状态值正确映射到交付ViewModel？

2 个答案: