How to send object of object in PagedListPager?

问题:

I have an action method that gets an object called InputObj.

public class InputObj<T>
{
    public T Item { get; set; }

    public int PageSize { get; set; }

    public int PageNumber { get; set; }
}

And the action method is:

    [HttpGet]
    public ActionResult Search(InputObj<USER> input)
    {

and in view I used PagedListPager if the search had results:

                    @if (ViewBag.Result != null)
                    {
                        @Html.PagedListPager((IPagedList)ViewBag.Result, page => Url.Action("Search", new InputObj<USER>
                   {
                       Item = Model.Item,
                       PageNumber = page,
                       PageSize = Model.PageSize
                   }))
                    }

But when I want to go to other pages, The Item is null, but PageNumber and PageSize are initialized correctly. In querystring I have

/User/Search?Item=MyApplication.Model.User&PageSize=2&PageNumber=2  

It seems we have .toString() here for Item!