Asp.net mvc 3 提交表单时DropdownList为空（MVC3）

我有一个创建页面和下拉列表。我的问题是，当我提交表单时，dropdownlist为空。请帮忙。这是我的密码

阶级

创建获取

看法

@型号MVCViewState.Models.Product

@{
    ViewBag.Title = "Create";
}

<h2>Create</h2>

<script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"></script>

@using (Html.BeginForm()) {
    @Html.ValidationSummary(true)
    <fieldset>
        <legend>Product</legend>

        <div class="editor-label">
            @Html.LabelFor(model => model.Name)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.Name)
            @Html.ValidationMessageFor(model => model.Name)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.Description)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.Description)
            @Html.ValidationMessageFor(model => model.Description)
        </div>
        <div class="editor-label">
            @Html.LabelFor(model => model.Types)
        </div>
        <div class="editor-field">
            @Html.DropDownListFor(model => model.Types, Model.Types)
            @Html.ValidationMessageFor(model => model.Types)
        </div>
        <p>
            <input type="submit" value="Create" />
        </p>
    </fieldset>
}

<div>
    @Html.ActionLink("Back to List", "Index")
</div>

创建帖子

---

我认为您的目的是获取所选类型的值。所以你需要这样的东西：

public class Product
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
    public List<SelectListItem> Types { get; set; }
    public int TypeId { get; set; } // the selected type from the dropdown
}

---

我认为您的目的是获取所选类型的值。所以你需要这样的东西：

public class Product
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
    public List<SelectListItem> Types { get; set; }
    public int TypeId { get; set; } // the selected type from the dropdown
}

public class Product
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
    public List<SelectListItem> Types { get; set; }
    public int TypeId { get; set; } // the selected type from the dropdown
}

 @Html.DropDownListFor(model => model.TypeId, Model.Types)