Ajax.RouteLink gives a 404

Question

I have this link

@Ajax.RouteLink("Bid", RouteNames.Ajax.BidOnLot,
            new
            {
                lotId = Model.Lot.Id,
                bidAmount = Model.NextBidAmountForUser
            },
            new AjaxOptions
            {
                HttpMethod = "POST",
                OnFailure = "OnFailure",
                OnSuccess = "OnSuccess"
            })

and this action method

[AjaxOnly, HttpPost]
        [Route("ajax/bid-on-lot/{lotId}/{bidAmount}", Name = RouteNames.Ajax.BidOnLot)]
        [Authorize]
        public JsonResult Bid(string lotId, decimal bidAmount)

RouteNames.Ajax.BidOnLot is set to "BidOnLot"

But for some reason when I click on the link, I get a 404 with this message.

404 Not Found - http://localhost:12472/ajax/bid-on-lot/lot-901/210.0

When I have only the LotId parameter everything works normally but adding an additional parameter makes it all fail.

Why is this happening?

Answer 1

Just in case anyone else struggles with this in the future let me tell you what the issue was. Passing a decimal parameter was the issue. Passing an int, double or string is fine but when I made it a decimal it failed.