Question

如果不符合某些条件，我正在开发httpmodule以隐藏我网站上的某些内容。我的处理程序设置非常简单。以下是我的问题的相关部分：

Public Interface IFeatureItem

  Property ID As Guid

  Sub FeatureItemPreRenderComplete(ByVal sender As Object, ByVal e As EventArgs)

End Interface

Public Class MyModule
  Implements System.Web.IHttpModule

  Public Sub Init(ByVal context As System.Web.HttpApplication) Implements System.Web.IHttpModule.Init
    AddHandler context.PreRequestHandlerExecute, AddressOf Application_PreRequestHandlerExecute
  End Sub

  Private Sub Application_PreRequestHandlerExecute(ByVal source As Object, ByVal e As EventArgs)

      If TypeOf source Is HttpApplication Then
          Dim Application As HttpApplication = source

          If TypeOf Application.Context.Handler Is Page Then
            Dim Page As Page = Application.Context.Handler
            AddHandler Page.PreRenderComplete, AddressOf FeatureItemPreRenderComplete                
          ElseIf TypeOf Application.Context.Handler Is System.Web.Mvc.MvcHandler Then
            Dim MvcHandler As System.Web.Mvc.MvcHandler = Application.Context.Handler
            <What do I do here>
        End If
      End If

  End Sub 


  Private Sub FeatureItemPreRenderComplete(ByVal source As Object, ByVal e As System.EventArgs)
    Dim Page As Page = source
    Dim Repository As IFeatureRepository = GetRepository(Page.Application)  'Holds supported IFeature
    Dim IFeatureItems As IEnumerable(Of IFeatureItem) = GetIFeatureItems(Page) 'Goes through Page's control tree and returns IFeatureItems

    For Each IFeatureItem In IFeatureItems
        Dim FeatureEventArgs As FeatureEventArgs = New FeatureEventArgs(IFeatureItem.ID, FeatureAllowed(IFeatureItem.ID, Repository))

        IFeatureItem.FeatureItemPreRenderComplete(Me, FeatureEventArgs)
    Next

  End Sub

  <Irrelevant stuff removed>

End Class

如果处理程序是页面，则基本上在页面对象上设置事件处理程序。然后在PreRenderEvent中，我遍历页面上的所有IFeatureItems并在IFeatureItem中调用一个方法。如果处理程序是页面，这很有用。

此站点具有仪表板的mvc视图，还包含可以是IFeatureItem的webforms控件。我想要做的是循环浏览此视图中的webforms控件，并对它们执行与在普通页面上相同的处理，但我无法找到一种方法，并且没有运气谷歌搜索。这可能在模块中吗？ PreRequestHandler是否正确设置我的事件处理程序？

Answer 1

您正试图从错误的扩展点进行此操作。

在MVC中，继承自ViewPage的{{1}}以虚拟Page方法呈现：WebFormView。

您的解决方案是覆盖此方法并在此处执行预渲染事件。

为了更好地了解如何有效地执行此操作，我建议使用.NET Reflector查看Render(ViewContext viewContext, TextWriter writer)，WebFormView和ViewPage的来源。基本上，WebFormView使用BuildManager基于ViewPath创建ViewUserControl或ViewPage。这两个类都来自ViewUserControl，因此从那里开始就应该是直截了当的。

当处理程序是MvcHandler时，获取对服务器控件的引用

1 个答案: