asp.net-mvc - 如何为 ASP.NET MVC 上的 GET 和 POST 操作绑定(bind)字典类型参数

Question

我想定义一个显示标签和复选框列表的 View ，用户可以更改复选框，然后回发。我在发回字典时遇到问题。即post方法的字典参数为null。

以下是 GET 和 POST 操作的操作方法:

 public ActionResult MasterEdit(int id)
        {

            Dictionary<string, bool> kv = new Dictionary<string, bool>()
                                            {
                                                {"A", true},
                                                {"B", false}
                                            };

            return View(kv);
        }


        [HttpPost]
        public ActionResult MasterEdit(Dictionary<string, bool> kv)
        {
            return RedirectToAction("MasterEdit", new { id = 1 });
        }

下面是景色

@model System.Collections.Generic.Dictionary<string, bool>
@{
    ViewBag.Title = "Edit";
}
<h2>
    MasterEdit</h2>

@using (Html.BeginForm())
{ 

    <table>
        @foreach(var dic in Model)
        { 
            <tr>
                @dic.Key <input type="checkbox" name="kv" value="@dic.Value"  />
            </tr>


        }
    </table>


   <input type="submit" value="Save" />
}

任何想法将不胜感激!

Answer 1

不要为此使用字典。它们在模型绑定(bind)方面表现不佳。可能是 PITA。

View 模型会更合适:

public class MyViewModel
{
    public string Id { get; set; }
    public bool Checked { get; set; }
}

然后是一个 Controller :

public class HomeController : Controller
{
    public ActionResult Index() 
    {
        var model = new[]
        {
            new MyViewModel { Id = "A", Checked = true },
            new MyViewModel { Id = "B", Checked = false },
        };
        return View(model);
    }

    [HttpPost]
    public ActionResult Index(IEnumerable<MyViewModel> model)
    {
        return View(model);
    }
}

然后是相应的 View (~/Views/Home/Index.cshtml):

@model IEnumerable<MyViewModel>

@using (Html.BeginForm())
{
    <table>
        <thead>
            <tr>
                <th></th>
            </tr>
        </thead>
        <tbody>
            @Html.EditorForModel()
        </tbody>
    </table>
    <input type="submit" value="Save" />
}

最后是相应的编辑器模板(~/Views/Home/EditorTemplates/MyViewModel.cshtml):

@model MyViewModel
<tr>
    <td>
        @Html.HiddenFor(x => x.Id)
        @Html.CheckBoxFor(x => x.Checked)
        @Html.DisplayFor(x => x.Id)
    </td>
</tr>