C# 具有继承、嵌套视图模型和局部视图的MVC复杂模型绑定

我无法将嵌套模型的值返回到控制器，它们都是空值

以下是简化的体系结构：

//The viewModel being passed to the view
public class RunnerIndexViewModel
{
    public RegisterViewModel User { get; set; }

    public TrainerViewModel TrainerVM { get; set; }

    public RunnerBase Runner { get; set; }

    [Display(Name = "AddContact", ResourceType = typeof(MyRessources))]
    public bool AddContact { get; set; }
}

public class RegisterViewModel
{
    // various simple type properties here
}

public class TrainerViewModel
{
    // various properties here
    public Unit unit { get; set; }

    public List<SelectListItem> ListStatut { get; set; }
}

public abstract partial class RunnerBase
{
    // entity framework class with associations
}

public class RedRunner : RunnerBase
{
    // entity framework class with associations
}

public class BlueRunner : RunnerBase
{
    // entity framework class with associations
}

视图PartialTrainer和PartialUser没有什么特殊之处，因此下面是PartialRunner视图，它从实体框架中获取基类：

@model RunnerBase

@* Show Various fields from RunnerBase ... *@

@if (Model is RedRunner)
{
    @* show properties specific to RedRunner *@
}
else if (Model is BlueRunner)
{
    @* show properties specific to BlueRunner *@
}   

我从控制器向Runner属性传递RedRunner或BlueRunner。所有viewModels的所有字段都显示得很好，但在提交表单时，我只获得AddContact值

---

如何获取其他ViewModel和Runner类的ViewModel的值？

问题在于使用partials。每次进入a部分时，模型上下文都会发生变化，因此Razor为您生成的输入没有考虑完整的属性路径。例如，如果要在主视图中执行以下操作：

@Html.EditorFor(m => m.TrainerVM.SomeProperty)

生成的HTML类似于：

<input type="text" name="TrainerVM.SomeProperty" />

<input type="text" name="SomeProperty" />

生成的HTML类似于：

<input type="text" name="TrainerVM.SomeProperty" />

<input type="text" name="SomeProperty" />

@Html.Partial("PartialTrainer", Model.TrainerVM, new ViewDataDictionary(ViewData)
{
    TemplateInfo = new TemplateInfo { HtmlFieldPrefix = "TrainerVM" }
})