/// <summary>
        /// 新建商品界面
        /// </summary>
        /// <returns></returns>
        public async Task <IActionResult> Create()
        {
            var brands = await brandManager.GetAllBrandsAsync();

            var tags = await tagManager.GetAllTagsAsync();

            var specifications = await specificationManager.GetAllSpecificationsAsync();

            CreateProductModel model = new CreateProductModel
            {
                Brands         = brands,
                Tags           = tags,
                Specifications = specifications
            };

            return(View(model));
        }