Ajax发布浮点值错误请求

Question

我要显示浮动值，但我不能。我已经尝试过JSON.stringify（）但它不会工作。请帮帮我。

        $.ajax({
            url: "/Home/GetItemsByFilter",
            method: "POST",
            data: {
                CategoryId: '',
                SubCategoryId: '',
                SubSubCategoryId: $("#sub_sub_category_id").val(),
                MinPrice: $("#min_price").val(),
                MaxPrice: $("#max_price").val(),
                BrandId: $("#brand").val(),
                OrderBy: $("#price_direction").val(),
                PageNumber: currentPage,
                PageSize: 18
            },
            error: function (response) {
                alert("There is something wrong!!!");
            },

来自控制器：

        ViewBag.MinPrice = Convert.ToDouble( ItemList.Min(m => m.PriceAfterDiscount));
        ViewBag.MaxPrice = Convert.ToDouble(ItemList.Max(m => m.PriceAfterDiscount));

GetItemsByFilter：

            double MinPrice = Convert.ToDouble(Request["MinPrice"]);
            double MaxPrice = Convert.ToDouble(Request["MaxPrice"]);
            double ActualMaxPrice = Convert.ToDouble(Request["ActualMaxPrice"]);
            string SubSubCategoryId = Request["SubSubCategoryId"];
            string CategoryId = Request["CategoryId"];
            string SubCategoryId = Request["SubCategoryId"];
            string BrandId = Request["BrandId"];
            string OrderByS = Request["OrderBy"];