我在使用c＃进行编码的逻辑上遇到了一些问题。我有一个列表，用于存储标准包装单元中的所有物品。当我循环通过列表时，如果我检测到某个项目库存不足，我会得到该项目的类别。之后，我传递给一个方法，该方法按降序对某个类别中的项目进行排序。然后我通过降序列表循环以获得具有最高库存的顶级产品，我将在网格视图中显示该项目作为建议项目。以下是我如何设置建议的网格视图：
<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>
背后的代码：
//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);
}
}
}
如果库存不足，请通过传递ID来调用getSuggested（）：
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();
}
获取最高产品库存水平降序的SQL方法：
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;
}
获取要在gridview建议中显示的项目详细信息的SQL方法：
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;
}
但是，当我运行该程序时，它会给出一条错误消息：在所选数据源上找不到名称为“name”的字段或属性。我不知道为什么会这样，当我在调试模式下运行时，它确实返回了我所有的值。只是它不会在网格视图中显示。
提前致谢。
修改
假设我将产品1,2,3添加到列表中，而产品1是库存水平最高的产品。产品2和3不足。因此，当我执行它时，由于产品1已经在列表中，因此系统应该找到第二高的并且替换为产品2.在替换产品2之后，系统应该将产品3替换为第三高。我的prodSubstitute已按降序排序，我只是想知道if循环中的if语句，我应该如何实现这个逻辑？
答案 0 :(得分：0)
由于prodSubstitute已按inventoryQuantity按降序排序，因此您可以使用prodSubstitute[n-1]