asp.net Listbox格式化在回发后不会持久化

Question

我有一个ListBox，它根据状态突出显示了项目。如果它们不完整，则为红色。从列表中选择一个项目并显示它的相关数据后，着色不起作用。如何保持此格式不变？

代码：

if (!IsPostBack)
        {
            MarkIncompleteList();
            DataTable dt = Data.GetOrderStatusTypes();

            ddlOrderStatusTypes.DataSource = dt;
            ddlOrderStatusTypes.DataTextField = "StatusName";
            ddlOrderStatusTypes.DataValueField = "StatusID";
            ddlOrderStatusTypes.DataBind();




            if (Request.QueryString["OrderID"] != "")
            {
                Data.GetOrderByNumber(ref currOrder, Request.QueryString["OrderID"]);
                DisplayOrderData();
            }
        }
        else

MarkIncompleteList（）;

protected void MarkIncompleteList()
    {
        // get a list of orders that are not complete for allerting
        List<string> iOrders = Data.GetIncomepletedOrders();

        lbOrderID.Text = "";
        List<string> ol = Data.GetOrdersList();
        // add the order list to the list box change the color if its in the 
        // incomplete list
        foreach (string s in ol)
        {
            if (iOrders.Contains(s))
            {
                lbCurrentOrders.Items.Add(s);
                lbCurrentOrders.Items[lbCurrentOrders.Items.Count - 1].Attributes.Add("style", "color:red");

            }
            else
                lbCurrentOrders.Items.Add(s);
        }
    }

Answer 1

抱歉这个愚蠢的问题，谢谢大家的快速回复。该问题与列表中的项目有关。选择后我没有清理物品。这导致我的列表看起来正常，但重新添加格式化列表到原始列表的末尾。我已经纠正了这个问题，现在它正常运作。

protected void MarkIncompleteList()
    {
        // remove the old items so the list is refreshed **************
        lbCurrentOrders.Items.Clear();
        // get a list of orders that are not complete for allerting
        List<string> iOrders = Data.GetIncomepletedOrders();

        lbOrderID.Text = "";
        List<string> ol = Data.GetOrdersList();
        foreach (string s in ol)
        {
            if (iOrders.Contains(s))
            {
                lbCurrentOrders.Items.Add(s);
                lbCurrentOrders.Items[lbCurrentOrders.Items.Count - 1].Attributes.Add("style", "color:red");

            }
            else
                lbCurrentOrders.Items.Add(s);
        }


    }