检查 Application_BeginRequest 上是否有 IsCallback

发布于 2024-07-26 15:29:00 字数 604 浏览 8 评论 0原文

我有一个 Web 应用程序（.NET 3.5），它在 Global.asax 中包含以下代码：

Sub Application_BeginRequest(ByVal sender As Object, ByVal e As EventArgs)
    LinkLoader()
    PathRewriter()
    PathAppender()
End Sub

我希望调用其中的所有函数，除非它是 AJAX 回调。因此，理想情况下我会将其更改为：

Sub Application_BeginRequest(ByVal sender As Object, ByVal e As EventArgs)
    If not Page.IsCallback then
        LinkLoader()
        PathRewriter()
        PathAppender()
    End If
End Sub

但此处无法访问页面对象。所以，基本上我的问题是：

如何检查请求是否是 Application_BeginRequest 内的 AJAX 回调？

非常感谢您的任何反馈。

原文

I have a web application (.NET 3.5) that has this code in Global.asax:

Sub Application_BeginRequest(ByVal sender As Object, ByVal e As EventArgs)
    LinkLoader()
    PathRewriter()
    PathAppender()
End Sub

I want all those functions inside to get called except for when it's an AJAX call back. So, ideally I would have it changed to:

Sub Application_BeginRequest(ByVal sender As Object, ByVal e As EventArgs)
    If not Page.IsCallback then
        LinkLoader()
        PathRewriter()
        PathAppender()
    End If
End Sub

But there is not access to the page object here. So, basically my question is:

How do I check if the request is an AJAX call back inside Application_BeginRequest?

Thank you very much for any feedback.

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

沉默的熊 2024-08-02 15:29:00

约翰，

谢谢你为我指明了正确的方向。解决方案实际上是检查 Request.Form("__ASYNCPOST")。如果它是回调，则将其设置为“true”。

非常感谢你的帮助！

回复收藏 0 原文

月下凄凉 2024-08-02 15:29:00

您应该有权访问 HttpContext.Current.Handler 对象，您可以将其转换为 Page 对象并获取 Page.IsPostBack 或 Page.IsCallBack。尽管为了安全地执行此操作，您需要首先测试它是一个 Page 对象并且不为 null：

With HttpContext.Current
   If TypeOf .Handler Is Page Then
      Dim page As Page = CType(.Handler, Page)
      If page IsNot Nothing AndAlso (page.IsCallBack OrElse page.IsPostBack) Then
         'Do something
      End If
   End If
End With

You should have access to the HttpContext.Current.Handler object which you can cast to a Page object and get Page.IsPostBack or Page.IsCallBack. Although in order to do this safely you need to first test that it is a Page object and not null:

With HttpContext.Current
   If TypeOf .Handler Is Page Then
      Dim page As Page = CType(.Handler, Page)
      If page IsNot Nothing AndAlso (page.IsCallBack OrElse page.IsPostBack) Then
         'Do something
      End If
   End If
End With

回复收藏 0 原文