將方法從一種方法傳遞到另一種時的邏輯

Question

我在使用c＃編碼的邏輯中遇到了一些問題。我有一個列表，它將所有物品存儲在標準包裝單元中。當我通過列表循環時，如果檢測到某個項目庫存不足，我會得到該項目的類別。之後，我傳遞給一個方法，按降序排序某個類別的項目。然後，我通過降序順序列表循環以獲得庫存最高的頂級產品，並且我將以網格視圖的形式顯示該項目作爲建議項目。這裏是我建立了我的建議的網格視圖：

<asp:GridView ID="gvSuggested" runat="server" AutoGenerateColumns="False" CellPadding="2" ForeColor="#333333" GridLines="None" Width="300px"> 
          <Columns> 
           <asp:BoundField DataField="name" HeaderText="Product Name" ItemStyle-Width="100px" /> 
           <asp:BoundField DataField="categoryName" HeaderText="Category" ItemStyle-Width="100px" /> 
          </Columns> 
         </asp:GridView> 

而後面的代碼：

//Portion to check the storage level for each products stored in tempList 
     //Loop thru tempList. key as prod variant ID, tempList.Keys as quantity 
     foreach (string key in tempList.Keys) 
     { 
      //Get total unit of each products 
      totalUnit = prodPackBLL.getTotalProductUnit(key); 
      valid = true; 

      //Check if unitQuantity exceed storage level 
      if (((Convert.ToInt32(tempList[key])) * packagesNeeded) > totalUnit) 
      { 
       //Get the label control in gridview 
       foreach (GridViewRow gr in gvFinalised.Rows) 
       { 
        if (key == gvFinalised.DataKeys[gr.RowIndex].Value.ToString()) 
        { 
         //Change the color of textBox and display the insufficient message 
         valid = false; 
         //Automatically uncheck the checkBox if invalid 
         TextBox tb = (TextBox)gr.FindControl("tbQuantity") as TextBox; 
         tb.CssClass = "alert alert-danger"; 
         tb.Attributes["style"] = "height: 3px; width: 50px; margin-bottom: 0px; padding-left: 0px"; 
         Label lblCheckAmount = gr.FindControl("lblCheckAmount") as Label; 
         lblCheckAmount.Text = "Insufficient stock!"; 

         getSuggested(key); 
        } 
       } 
      } 

如果庫存不足，調用getSuggested（）通過傳遞ID一起：

protected void getSuggested(string prodVariantID) 
    { 
     string categoryName = prodPackBLL.getCategoryByProdVariantID(prodVariantID); 

     //Get the list of substitute product with highest storage level sorted in descending order 
     List<ProductPacking> prodSubstitute = new List<ProductPacking>(); 
     List<string> lstCategory = new List<string>(); 
     List<string> prodIDList = new List<string>(); 
     List<DistributionStandardPackingUnitItems> distSPUItem = new List<DistributionStandardPackingUnitItems>(); 

     //Find list of substitute with highest stock level and replace the product 
     prodSubstitute = prodPackBLL.getProductIDWithHighestStock(categoryName); 

     for (int count = 0; count < prodSubstitute.Count; count++) 
     { 
      //To prevent duplication of same product and select those catories which are in current category and counting them and taking them if there are less than 1 occurrences 
      if (!prodIDList.Contains(prodSubstitute[count].id) && !(lstCategory.Where(x => x.Equals(categoryName)).Select(x => x).Count() >= 1)) 
      { 
       prodIDList.Add(prodSubstitute[count].id); 
       lstCategory.Add(categoryName); 
      } 
     } 

     for (int j = 0; j < prodIDList.Count; j++) 
     { 
      //Get the detail of the product added into prodList and add it into distSPUItem List 
      distSPUItem.Add(packBLL.getSPUItemDetailByID(prodIDList[j])); 
     } 

     gvSuggested.DataSource = distSPUItemList; 
     gvSuggested.DataBind(); 
    } 

SQL方法獲得最高產品庫存水平的降序：

public List<ProductPacking> getProductIDWithHighestStock(string categoryName) 
    { 
     List<ProductPacking> prodSubstitute = new List<ProductPacking>(); 

     using (var connection = new SqlConnection(FoodBankDB.connectionString)) 
     { 
      SqlCommand command = new SqlCommand("SELECT p.id, p.inventoryQuantity FROM dbo.Products p " + 
       " INNER JOIN dbo.ProductVariants pv ON p.id = pv.product " + 
       " INNER JOIN dbo.ProductCategories pc ON p.productCategory = pc.id " + 
       " WHERE pc.categoryName = '" + categoryName + "' " + 
       " ORDER BY Convert(INT, p.inventoryQuantity) DESC", connection); 
      connection.Open(); 
      using (var dr = command.ExecuteReader()) 
      { 
       while (dr.Read()) 
       { 
        string prodID = dr["id"].ToString(); 

        prodSubstitute.Add(new ProductPacking(prodID)); 
       } 
      } 
     } 

     return prodSubstitute; 
    } 

顯示在GridView中

SQL方法來獲取項目的詳細建議：

public DistributionStandardPackingUnitItems getSPUItemDetailByID(string prodID) 
    { 
     DistributionStandardPackingUnitItems item = new DistributionStandardPackingUnitItems(); 

     using (var connection = new SqlConnection(FoodBankDB.connectionString)) 
     { 
      SqlCommand command = new SqlCommand("SELECT p.id, p.name, p.description, pc.categoryName FROM dbo.Products p " + 
       " INNER JOIN dbo.ProductCategories pc ON p.productCategory = pc.id " + 
       " WHERE p.id = '" + prodID + "'" + 
       " ORDER BY pc.categoryName ", connection); 
      connection.Open(); 
      using (var dr = command.ExecuteReader()) 
      { 
       while (dr.Read()) 
       { 
        string id = dr["id"].ToString(); 
        string name = dr["name"].ToString(); 
        string description = dr["description"].ToString(); 
        string categoryName = dr["categoryName"].ToString(); 

        item = new DistributionStandardPackingUnitItems(id, name, description, categoryName, ""); 
       } 
      } 
     } 

     return item; 
    } 

然而，當我運行程序，它給了我一個錯誤信息：字段或屬性名稱爲「名」未在所選數據源中找到。我不知道爲什麼當我以調試模式運行時，它確實返回了我所有的值。只是它不會在網格視圖中顯示。

在此先感謝。

編輯

比方說，我加入產品1,2,3-到列表中，而產品1是具有最高庫存水平的產品。產品2和3不夠。因此，當我執行它時，由於產品1已經在列表中，所以系統應該找到第二高的產品並替換產品2.在產品2被替換之後，系統應該替換第三高的產品3。我的prodSubstitute已經按照降序排列，我只是在for循環裏面懷疑if語句，我該如何實現這個邏輯呢？

Answer 1

由於prodSubstitute已經被inventoryQuantity降序排序，您可以通過使用prodSubstitute[n-1]