model - 包含模型的模型列表(MVC-3，Razor)

这个问题困扰了我两天了。有一些类似的帖子，但是都没有完全解决我的问题。

使用MVC-3，Razor语法:

-EDIT.cshtml-

@using (Html.BeginForm("Edit", "My", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    <!-- Some fields... -->
    <div class="editor-field">
        @Html.TextAreaFor(m => m.LongDescription)
        @Html.ValidationMessageFor(m => m.LongDescription)
    </div>

    <!-- Some more fields work... Including picture upload (summary).-->
    <input name="button" type="submit" value="Add Picture" />

    <!-- Picture Item display -->
    @foreach(var thumbnail in Model.ThumbnailImagePathAndNames)
    {
      <img src="@Url.Content(@thumbnail.ThumbnailPicturePath)" alt="" width="200" />
      @Html.RadioButtonFor(o=>o.SelectedImage, @thumbnail.ImageGUID)  Primary Picture
      <!-- Checkbox to mark for deletion -->
      @Html.CheckBoxFor(o=>thumbnail.Delete) Delete ???????? <!---- Here is a problem - I don't understand how this should work -->
    }
    <input id="Submit1" name="button" type="submit" value="Complete Edit!" />
}

-MyController.cs-

 [HttpPost]
 public ActionResult Edit(String button, HttpPostedFileBase file, MyMainModel model)
 {
     // if button = submit picture,  work with picture here and break(long story)

     // save model data
         // if valid, save and redirect


     // not valid or error, load up view like normal but with error messages
     model.LoadThumbnails();
     return View(model);

 }

-MyMainModel.cs-

public class MyMainModel
{
    // some properties...
     public Guid? SelectedImage { get; set; }

    [Display(Name = "Detailed Description")]
    public String LongDescription { get; set; }

    // some more properties....


    // and finally my list of models
    public IList<ThumbnailModel> ThumbnailImagePathAndNames { get; set; }

    public void LoadThumbnails()
    {
         // load up initial thumbnail models
         this.ThumbnailImagePathAndNames = new List<ThumbnailModel>(readDataService.GetThumbnailModels(this.SomeID));
    }
}

-ThumbnailModels.cs-

public class ThumbnailModel
{
    public Guid ImageGUID { get; set; }
    public String FullSizePicturePath { get; set; }
    public String ThumbnailPicturePath { get; set; }

    public bool Delete { get; set; }
}

所以有什么问题？好吧，当“完成编辑!”按下按钮，将按预期的方式调用MyController的Edit，而所有MyMainModle的数据都保持不变....除了ThumbnailModel的列表以外-事实证明它们为null。

应该怎么做？我已经尝试了许多不同的方法，包括制作一个可编辑的模板和使用EditFor(o => ...都无济于事(这变得令人困惑，因为我不知道EditFor是否应该用于整个收藏集，或者仅仅是集合中的一个项目-我尝试了两种方式。所有这些都一直起作用，直到我添加了要删除的复选框的复杂性，因此需要检索ThumbnailModels列表以检查内部Delete属性值。

谢谢大家阅读并尝试理解这一点。

[免责声明-已更改了一些变量和方法名称，以保护无辜的程序。许多代码已被剥离，并由注释代码代替。]

最佳答案

这是我用来说明一些概念的示例:

模型:

public class MyMainModel
{
    public Guid? SelectedImage { get; set; }
    public string LongDescription { get; set; }

    public IEnumerable<ThumbnailModel> ThumbnailImagePathAndNames { get; set; }

    public HttpPostedFileBase File { get; set; }
}

public class ThumbnailModel
{
    public Guid ImageGUID { get; set; }
    public bool Delete { get; set; }
}

Controller :

public class HomeController : Controller
{
    public ActionResult Index()
    {
        var model = new MyMainModel
        {
            // TODO: fetch from the repository instead of hardcoding
            ThumbnailImagePathAndNames = new[]
            {
                new ThumbnailModel { ImageGUID = Guid.NewGuid() },
                new ThumbnailModel { ImageGUID = Guid.NewGuid() },
                new ThumbnailModel { ImageGUID = Guid.NewGuid() },
            }
        };
        return View(model);
    }

    [HttpPost]
    public ActionResult Index(MyMainModel model)
    {
        ... the model will be properly bound here
    }
}

View :

@model AppName.Models.MyMainModel
@{
    ViewBag.Title = "Index";
    Layout = "~/Views/Shared/_Layout.cshtml";
}
@using (Html.BeginForm("index", "home", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    <div class="editor-field">
        @Html.TextAreaFor(m => m.LongDescription)
        @Html.ValidationMessageFor(m => m.LongDescription)
    </div>
    <input type="file" name="file" />
    <!-- Use different names for the upload and complete submit
         buttons so that you can distinguish which one was clicked
         in the POST action
    -->
    <input name="upload" type="submit" value="Add Picture" />

    @Html.EditorFor(x => x.ThumbnailImagePathAndNames)
    <input name="complete" type="submit" value="Complete Edit!" />
}

编辑器模板:(~/Views/Home/EditorTemplates/ThumbnailModel.cshtml):

@model AppName.Models.ThumbnailModel
<!-- Pass the image id as hidden field -->
@Html.HiddenFor(x => x.ImageGUID)
@Html.CheckBoxFor(x => x.Delete)

关于model - 包含模型的模型列表(MVC-3，Razor)，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/4720330/