c# - EditorTemplate 中的 MVC 字典

Question

我不想将字典绑定(bind)到 View 。但该模型似乎为空。 棘手的部分是我在另一个 View 中使用一个 View ，但我无法弄清楚我的错误在哪里。

这是迄今为止我的代码:

第一个模型:

public class QuantityAndSize
{
    private Dictionary<String, int> m_Size;

    public decimal Quantity {get;set;}
    public Dictionary<string,int> Size 
    {
        get
        {
            return m_Size;
        }
        set 
        {
            m_Size = value;
        }
    }
    public int SelectedItem {get;set;}

    public QuantityAndSize() 
    {
        Quantity = 0;
        m_Size = new Dictionary<string, int>();
        SelectedItem = 0;
    }
}

第二个模型

public class NewItemDeliveryModel
{
    #region - member -
    private string m_Subject;
    private QuantityAndSize m_ShortfallQuantity;
    #endregion

    #region - properties

    [Display(Name = "Betreff")]
    public string Subject
    {
        get { return m_Subject; }
        set { m_Subject = value; }
    }

    [Display(Name = "Fehlmenge")]
    public QuantityAndSize ShortfallQuantity
    {
        get { return m_ShortfallQuantity; }
        set { m_ShortfallQuantity = value; }
    }

    #endregion

    #region - ctor -

    public NewItemDeliveryModel() 
    {
        m_ShortfallQuantity = new QuantityAndSize();
    }

    #endregion
}

这里有一个 NewItemDeliveryModel 的 View

@model Web.Models.NewItemDeliveryModel
@{
    ViewBag.Title = "NewItemDelivery";
}

<h2>NewItemDelivery</h2>
@using (Html.BeginForm())
{
    <div class="form-horizontal">
        <div class="form-group">
            @Html.LabelFor(model => model.Subject, new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Subject)
                @Html.ValidationMessageFor(model => model.Subject)
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.ShortfallQuantity, new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.ShortfallQuantity)
                @Html.ValidationMessageFor(model => model.ShortfallQuantity)
            </div>
        </div>
    </div>
}

以及 QuantityAndSize 的 View

@model Web.Models.Structures.QuantityAndSize

<div class="form-group">
    @Html.LabelFor(model => model.Quantity, new { @class = "control-label col-md-2" })
    <div class="col-md-10">
        @Html.EditorFor(model => model.Quantity)
        @Html.ValidationMessageFor(model => model.Quantity)
    </div>
</div>

<div class="form-group">
    @Html.LabelFor(model => model.Size, new { @class = "control-label col-md-2" })
    <div class="col-md-10">
        @Html.DropDownListFor(model => model.Size, new SelectList(Model.Size,"Key","Value"), "Sizes")  //<-- Model.Size says that Model is null but i can't figure out why
        @Html.ValidationMessageFor(model => model.Size)
    </div>
</div>

问题是，我无法将字典绑定(bind)到 Html.DropDownList，因为模型为 Null。 我对 ASP.Net MVC 相当陌生，问题本身看起来很简单，但我找不到错误的原因。 所以我的问题是为什么我的 Model 等于 Null ？

顺便说一句， Controller 非常小，但为了完整起见，它来了

public class NewItemDeliveryController : Controller
{
    // GET: NewItemDelivery
    public ActionResult Index()
    {
        return View("NewItemDelivery");
    }
}

Answer 1

在这里，您需要将模型传递到 View 中，如下所示:

// GET: NewItemDelivery
    public ActionResult Index()
    {
        var myModel = new NewItemDeliveryModel();
        return View("NewItemDelivery", myModel);
    }

旁注:从 MVC 6 开始，您将能够直接向 View 注入(inject)依赖项。

请参阅此处了解更多信息:https://neelbhatt40.wordpress.com/2015/08/14/inject-new-directive-of-mvc/