自定义模型绑定未执行

Question

我有两个自定义绑定器可以绑定.margin-top-20 { margin-top: 20px; } 和DateTime。

我正在DateTime?中注册它们：

Global.asax

我也尝试过这样：

public class MvcApplication : HttpApplication
{
    protected void Application_Start()
    {
        AreaRegistration.RegisterAllAreas();
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
        BundleConfig.RegisterBundles(BundleTable.Bundles);

        ModelBinders.Binders[typeof (DateTime)] = new DateTimeModelBinder();
        //ModelBinders.Binders[typeof (DateTime?)] = new NullableDateTimeModelBinder();

        //ModelBinders.Binders.Add(typeof (DateTime), new DateTimeModelBinder());
        //ModelBinders.Binders.Add(typeof(DateTime?), new NullableDateTimeModelBinder());
    }
}

然而，它们永远不会被击中。

模型绑定类在这里（从Internet上窃取）：

ModelBinders.Binders.Add(typeof (DateTime), new DateTimeModelBinder());
ModelBinders.Binders.Add(typeof(DateTime?), new NullableDateTimeModelBinder());

在这里：

public class DateTimeModelBinder : IModelBinder
{
    public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        var value = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);

        DateTime dateTime;

        var isDate = DateTime.TryParse(value.AttemptedValue,
            Thread.CurrentThread.CurrentUICulture,
            DateTimeStyles.None,
            out dateTime);

        if (!isDate)
        {
            bindingContext.ModelState.AddModelError(bindingContext.ModelName,
                $"Cannot bind value {value.AttemptedValue} to a DateTime");
            return DateTime.UtcNow;
        }

        return dateTime;
    }
}

我错过了什么？