/// <summary>
        /// 删除标准物质
        /// </summary>
        /// <param name="materialId"></param>
        /// <returns></returns>
        public int DeleteMaterialById(string materialId)
        {
            string img_name = GetImgPath(materialId);

            int ret = new MaterialService().DeleteMaterialById(materialId);

            if (ret > 0)
            {
                new Common().DeleteFile(img_name, fileType.ImageType);
            }

            return(ret);
        }
        public int UpdateMaterialById(Material material)
        {
            string oldImageName = GetImgPath(material.MaterialId);

            material.CategoryId = new ProductCategoryManager().GetProductCategoryId(material.CategoryName);

            int ret = new MaterialService().UpdateMaterialById(material);

            if (ret > 0)
            {
                new Common().DeleteFile(oldImageName, fileType.ImageType);
            }

            return(ret);
        }
        public int UpdateMaterial(Material material)
        {
            bool deleteFlag = true;

            string oldImageName = GetImgPath(material.MaterialId);

            if (material.Img == String.Empty)
            {
                material.Img = oldImageName;
                deleteFlag   = false;
            }

            material.CategoryId = GetCategoryId(material.CategoryName);
            int ret = new MaterialService().UpdateMaterial(material);

            if (ret > 0 && deleteFlag)
            {
                new Common().DeleteFile(oldImageName, fileType.ImageType);
            }

            return(ret);
        }