包含模型列表的模型(MVC-3,Razor)

这个问题一直困扰我两天了。有一些类似的帖子，但没有一个完全解决我的问题。

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？好了，当“完成编辑！按钮，MyController的编辑被调用，如所期望的所有MyMainModle的数据在tact ….除了ThumbnailModel的列表 – 那些结果是null。

这应该怎么做？我尝试了许多不同的方法，包括使一个可编辑的模板和使用EditFor(o => …所有无法使用(这变得混乱，因为我不知道EditFor是否应该是整个集合或只是在集合中的一个项目 – 我尝试了两种方式)。所有使用的工作，直到我添加复选框的删除，因此需要检索ThumbnailModels列表检查内部Delete属性值。

谢谢大家的阅读和试​​图理解这一点。

[免责声明 – 一些变量和方法名称已更改以保护无辜程序。很多代码已经被删除，并替换为注释代码。]

解决方法

这里有一个例子，我用来说明一些概念：

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; }
}

控制器：

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() },}
        };
        return View(model);
    }

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

视图：

@model AppName.Models.MyMainModel
@{
    ViewBag.Title = "Index";
    Layout = "~/Views/Shared/_Layout.cshtml";
}
@using (Html.BeginForm("index","home",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)