我有一个自定义的ModelBinder(MVC3),由于某种原因没有被解雇。以下是相关的代码:
查看
@model WebApp.Models.InfoModel
@using Html.BeginForm()
{
@Html.EditorFor(m => m.Truck)
}
EditorTemplate
@model WebApp.Models.TruckModel
@Html.EditorFor(m => m.CabSize)
ModelBinder的
public class TruckModelBinder : IModelBinder
{
public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
{
throw new NotImplementedException();
}
}
Global.asax中
protected void Application_Start()
{
...
ModelBinders.Binders.Add(typeof(TruckModel), new TruckModelBinder());
...
}
InfoModel
public class InfoModel
{
public VehicleModel Vehicle { get; set; }
}
VehicleModel
public class VehicleModel
{
public string Color { get; set; }
public int NumberOfWheels { get; set; }
}
TruckModel
public class TruckModel : VehicleModel
{
public int CabSize { get; set; }
}
控制器
public ActionResult Index(InfoModel model)
{
// model.Vehicle is *not* of type TruckModel!
}
为什么我的自定义ModelBinder无法启动?
答案 0 :(得分:7)
您必须将模型绑定器与基类关联:
ModelBinders.Binders.Add(typeof(VehicleModel), new TruckModelBinder());
您的POST操作采用InfoModel参数,该参数本身具有VehicleModel类型的Vehicle属性。因此,MVC在绑定过程中不了解TruckModel。
您可以查看实现多态模型绑定器的示例的following post。