asp.net-mvc – 如何将整个ViewModel传递回控制器

public class LookUpViewModel
{
    public Searchable Searchable { get; set; }
    public AddToSearchable AddToSearchable { get; set; }
}

两个包含的模型看起来像这样：

public class Searchable
{
    [Key]
    public int SearchableId { get; set; }
    public virtual ICollection<AddToSearchable> AddedData { get; set; }
}

public class AddToSearchable
{
    [Key]
    public int AddToSearchableId { get; set;}
    [Required]
    public int SearchableId { get; set; }
    [Required]
    public String Data { get; set; }
    [Required]
    public virtual Searchable Searchable { get; set; }
}

我有一个视图,使用我的LookUpViewModel并接收输入来搜索SearchableId.如果找到Searchable对象,则会创建一个LookUpViewModel对象并将其传递给View.然后,该视图显示AddToSearchable.Data的编辑器字段.提交后,我希望将LookUpViewModel传递给action方法来处理所有后端代码.唯一的问题是,传递给我的action方法的LookUpViewModel包含对Searchable的空引用和对AddToSearchable的有效引用.即我丢失了一半的数据.

以下是我的视图的示例：

@model HearingAidTrackingSystem.ViewModels.LookUpViewModel

@using (Html.BeginForm("LookUp","Controller","idStr",FormMethod.Post))
{
    <input type="text" name="idStr" id="idStr"/>
    <input type="submit" value="Search" />
}

@if (Model.Searchable != null && Model.AddToSearchable != null)
{
    using (Html.BeginForm("AddMyStuff","Controller"))
    {
        Html.HiddenFor(model => model.Searchable.SearchableId);
        Html.HiddenFor(model => model.Searchable.AddedData);
        Html.HiddenFor(model => model.AddToSearchable.AddToSearchableId);
        Html.HiddenFor(model => model.AddToSearchable.SearchableId);
        Html.HiddenFor(model => model.AddToSearchable.Searchable);

        <div class="editor-field">
            @Html.EditorFor(model => model.AddToSearchable.Data)
            @Html.ValidationMessageFor(model => model.AddToSearchable.Data);
        </div>                                    

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

这是我的行动方法：

public ActionResult LookUp(LookUpViewModel vm)
{
    return View(vm);
}

[HttpPost]
public ActionResult LookUp(string idStr)
{
    int id = /*code to parse string to int goes here*/;

    Searchable searchable = dal.GetById(id);
    LookUpViewModel vm = new LookUpViewModel { Searchable = searchable,AddToSearchable = new AddToSearchable() };
    //When breakpoint is set,vm contains valid references
    return View(vm);
}

[HttpPost]
public ActionResult AddMyStuff(LookUpViewModel vm)
{
    //**Problem lies here**

    //Do backend stuff
}

很抱歉这篇冗长的帖子.我尽力保持简单.你可能有任何建议……开火.