asp.net-mvc-3 – 带抽象类的mvc3 razor editortemplate

模型：

public class MyViewModel
{
    public IList<BaseClass> Children { get; set; }
}

public abstract class BaseClass
{
    public int Id { get; set; }

    [HiddenInput(DisplayValue = false)]
    public string ModelType
    {
        get { return GetType().FullName; }
    }
}

public class Derived1 : BaseClass
{
    public string Derived1Property { get; set; }
}

public class Derived2 : BaseClass
{
    public string Derived2Property { get; set; }
}

控制器：

public class HomeController : Controller
{
    public ActionResult Index()
    {
        var model = new MyViewModel
        {
            Children = new BaseClass[]
            {
                new Derived1 { Id = 1,Derived1Property = "prop1" },new Derived2 { Id = 2,Derived2Property = "prop2" },}
        };
        return View(model);
    }

    [HttpPost]
    public ActionResult Index(MyViewModel model)
    {
        // everything will be fine and dandy here
        ...
    }
}

查看(?/ Views / Home / Index.cshtml)：

@model MyViewModel

@using (Html.BeginForm())
{
    for (int i = 0; i < Model.Children.Count; i++)
    {
        @Html.EditorFor(x => x.Children[i].ModelType)
        <div>
            @Html.EditorFor(x => x.Children[i].Id)
            @Html.EditorFor(x => x.Children[i])    
        </div>
    }

    <button type="submit">OK</button>
}

Dervied1类型的编辑器模板(?/ Views / Home / EditorTemplates / Derived1.cshtml)：

@model Derived1
@Html.EditorFor(x => x.Derived1Property)

和Dervied2类型的编辑器模板(?/ Views / Home / EditorTemplates / Derived2.cshtml)：

@model Derived2
@Html.EditorFor(x => x.Derived2Property)

现在剩下的就是一个自定义模型绑定器,它将使用隐藏字段值来实例化集合中的正确类型：

public class BaseClassModelBinder : DefaultModelBinder
{
    protected override object CreateModel(ControllerContext controllerContext,ModelBindingContext bindingContext,Type modelType)
    {
        var typeValue = bindingContext.ValueProvider.GetValue(bindingContext.ModelName + ".ModelType");
        var type = Type.GetType(
            (string)typeValue.ConvertTo(typeof(string)),true
        );
        var model = Activator.CreateInstance(type);
        bindingContext.ModelMetadata = ModelMetadataProviders.Current.GetMetadataForType(() => model,type);
        return model;
    }
}

将在Application_Start中注册：

ModelBinders.Binders.Add(typeof(BaseClass),new BaseClassModelBinder());