Question

在尝试保存订单时，我们首先从会话加载对象。这有效。然后我们将信息添加到订单并将其重新放入会话中。然后我收到并且对象引用没有设置为对象错误的实例。

Private Sub SaveOrder()
    'load the order
    Order = Session("Order")

    'Add order information here

    Session("Order") = Order 'The error is occurring here.
End Sub

堆栈跟踪如下：

    Error Path: Contact.aspx
    Error Detail: Object reference not set to an instance of an object.
    Error Source: Void __RenderContent1(System.Web.UI.HtmlTextWriter, System.Web.UI.Control)
    Error Stack Trace:    at ASP.orderentry_uc3_contact_aspx.__RenderContent1(HtmlTextWriter __w, Control parameterContainer) in C:\Portal Websites\Portals\OrderEntry\UC3\Contact.aspx:line 9
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer)
   at System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer)
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Page.Render(HtmlTextWriter writer)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

对此有任何帮助将非常感激。

添加了请求的代码：

Imports ComponentArt.Web.UI

Partial Class OrderEntry_UC3_Contact
Inherits Company.Pages.CompanyPage
Public Order As Company.Orders.UC3.Order

Protected Sub btnNext_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnNext.Click
    If Valid() Then
        SaveOrder() 'This is line 9
        Response.Redirect("Payment.aspx")
    End If
End Sub

我已经添加了aspx页面的顶部（整个事情太大了）。

<%@ Page Language="VB" MasterPageFile="~/Portal/PortalNoFooter.master" AutoEventWireup="false"
    EnableTheming="true" CodeFile="Contact.aspx.vb" Inherits="OrderEntry_UC3_Contact"
    Title="Contact" %>

<%@ Register TagPrefix="ComponentArt" Namespace="ComponentArt.Web.UI" Assembly="ComponentArt.Web.UI" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
      //To large to submit the whole thing
</asp:Content>
enter code here

Answer 1

您的代码示例不显示Page_Load或aspx文件第9行周围的确切行，但听起来您假设将始终填充Order。如果您仅在非回发期间在Order中加载Page_Load对象，则当用户单击该按钮时，Order对象在页面生命周期中的加载时间不够早。 / p>

尝试删除对IsPostback的检查，并始终从会话中重新加载Order对象。

保存到会话时，对象引用未设置为对象的实例

1 个答案: