//=========================== 購物車商品刪除 =========================== //
        public static void fn購物車商品刪除(CCartProduct cartProduct)
        {
            string sql = $"EXEC 購物車商品刪除 ";

            sql += $"@{CCartProductKey.fCartProductId}";

            List <SqlParameter> paras = new List <SqlParameter>()
            {
                new SqlParameter(CCartProductKey.fCartProductId, cartProduct.fCartProductId),
            };

            CDbManager.executeSql(sql, paras);
        }
        //=========================== 購物車商品新增 =========================== //
        public static CCartProduct fn購物車商品新增(CProduct product, CCart cart)
        {
            string sql = $"EXEC 購物車商品新增 ";

            sql += $"@{CCartProductKey.fProductId},";
            sql += $"@{CCartProductKey.fCartId}";

            List <SqlParameter> paras = new List <SqlParameter>()
            {
                new SqlParameter(CCartProductKey.fProductId, product.fProductId),
                new SqlParameter(CCartProductKey.fCartId, cart.fCartId)
            };

            CDbManager.executeSql(sql, paras);
            CCartProduct NewCartProduct = fn購物車商品查詢().LastOrDefault();

            return(NewCartProduct);
        }