//無搜尋值的搜尋資料方法
        public List <Products> GetAllDataList(ForPaging Paging)
        {
            //宣告要回傳的搜尋資料為資料庫中的Guestbooks資料表
            IQueryable <Products> Data = db.Products;

            //計算所需的總頁數
            Paging.MaxPage = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(Data.Count()) / Paging.ItemNum));
            //重新設定正確的頁數,避免有不正確值傳入
            Paging.SetRightPage();
            //回傳搜尋資料
            return(Data.OrderByDescending(p => p.ProductID).Skip((Paging.NowPage - 1) * Paging.ItemNum).Take(Paging.ItemNum).ToList());
        }
        //根據搜尋來取得資料陣列的方法
        public List <Products> GetDataList(ForPaging Paging, ProductsView searchCondition)
        {
            //宣告要接受全部搜尋資料的物件
            IQueryable <Products> SearchData;

            SearchData = db.Products;

            string productID   = "";
            string productName = "";

            if (searchCondition.ProductID != null)
            {
                productID = searchCondition.ProductID.ToString().Trim();
            }

            if (searchCondition.ProductName != null)
            {
                productName = searchCondition.ProductName.Trim();
            }

            if (String.IsNullOrEmpty(productID) == false)
            {
                SearchData = SearchData.Where(p => p.ProductID.ToString().Contains(productID));
            }

            if (String.IsNullOrEmpty(productName) == false)
            {
                SearchData = SearchData.Where(p => p.ProductName.ToString().Contains(productName));
            }

            //計算所需的總頁數
            Paging.MaxPage = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(SearchData.Count()) / Paging.ItemNum));

            //重新設定正確的頁數,避免有不正確值傳入
            Paging.SetRightPage();

            //先排序再根據分頁來回傳所需部分的資料陣列
            return(SearchData.OrderByDescending(p => p.ProductID).Skip((Paging.NowPage - 1) * Paging.ItemNum).Take(Paging.ItemNum).ToList());
        }