c# MVC Post表单没有从视图传递ID到控制器

我是MVC新手。我在做一个拍卖应用程序。在拍卖网站上，应该有一个形式，使出价。我有一个问题，将拍卖参数传递给控制器

My models:

public class Auctions
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int ID { get; set; }
    public string title { get; set; }
    (..) some other fields
    public List<Bid> bids = new List<Bid>(); 
}
public class BiddingViewModel
{
    public Auctions auctionToSend { get; set; }
    public double bid { get; set; }
}

我的观点:

@model BiddingViewModel
@using(Html.BeginForm("CreateBid", "Auction", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    @Html.HiddenFor(model=>model.auctionToSend)
    @Html.EditorFor(model => model.bid)
    <input type="submit" value="Make it work" />
}

和我的控制器:

[AllowAnonymous]
public ActionResult AuctionPage(int id)
{
    var tmp = _context.Auctions.FirstOrDefault(i => i.ID == id);
    BiddingViewModel bvm = new BiddingViewModel
    {
        auctionToSend = tmp,
        bid = -1
    };
    return View(bvm);
}

[Authorize]
[HttpPost]
public async Task<ActionResult> CreateBid(BiddingViewModel bvm)
{
    //After filling the form from view, the bvm.auctionToSend is null, whereas the bvm.bid value is visible
    return RedirectToAction("AuctionList", "Auction");
}

我的问题是拍卖数据(在视图中完全可见)没有发送回控制器。我查了一下互联网，它给我展示了一些命名冲突的解决方案，所以我确定命名是不同的，但这并没有解决我的问题。

<input type="hidden" name="auctionToSend" value="yourAssembly.Auctions" ... />

 @Html.HiddenFor(m => m.auctionToSend.ID)