如何为ASP.NET MVC上的GET和POST操作绑定字典类型参数(How to bind Dictionary type parameter for both GET and POST actio

如何为ASP.NET MVC上的GET和POST操作绑定字典类型参数(How to bind Dictionary type parameter for both GET and POST action on ASP.NET MVC)

我想定义一个显示标签和复选框列表的视图，用户可以更改复选框，然后回发。 我在回复字典时遇到问题。 也就是说，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 }); }

Beliw是观点

@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" /> }

任何想法将非常感激！

I want to define a view which displays a list of label and checkbox, user can change the checkbox, then post back. I have problem posting back the dictionary. That is, The dictionary parameter for the post method is null.

Below are action method for both GET and POST action:

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 }); }

Beliw is the view

@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" /> }

Any idea would be very much appreciated!

最满意答案

不要为此使用字典。 模型绑定效果不佳。 可能是PITA。

视图模型会更合适：

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

然后一个控制器：

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); } }

然后是相应的视图（ ~/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>

Don't use a dictionary for this. They don't play well with model binding. Could be a PITA.

A view model would be more appropriate:

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

then a 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); } }

then a corresponding 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" /> }

and finally the corresponding editor template (~/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>