哪个ValueProviderFactory采用表单数据？

Question

我在Global.asax中有以下代码：

    public class MvcApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            //ValueProviderFactories.Factories.RemoveAt(0);
            //I have tried replacing 0 above with 1 to 6.
            //The following Factories are present in ValueProviderFactories.Factories:
            //ChildActionValueProviderFactory
            //FormValueProviderFactory
            //JsonValueProviderFactory
            //RouteDataValueProviderFactory
            //QueryStringValueProviderFactory
            //HttpFileCollectionValueProviderFactory
            //JQueryFormValueProviderFactory
            ValueProviderFactories.Factories.Clear();            
        }
    }

我注意到清除所有ValueProviderFactory会导致表单数据作为null进入一种操作方法，但是当我尝试通过取消注释RemoveAt一次删除一个表单时行，并注释掉ValueProviderFactories.Factories.Clear();表单数据以非null的形式通过。

然后ValueProviderFactory负责获取表单数据？

这是视图：

@using MvcModels.Models
@model IList<AddressSummary>
@{
    Layout = null;
}
<h2>Addresses</h2>

@using (Html.BeginForm())
{
    <fieldset>
        <legend>Address</legend>
        <div><label>City:</label>@Html.Editor("[0].City")</div>
        <div><label>Country:</label>@Html.Editor("[0].Country")</div>
    </fieldset>
    <button type="submit">Submit</button>
}

操作方法：

public ActionResult Address(IList<AddressSummary> addresses)
{
    addresses = addresses ?? new List<AddressSummary>();
    return View(addresses);
}

型号：

public class AddressSummary
{        
    [Required]
    public string City { get; set; }
    [Required]
    public string Country { get; set; }
}