HTTP模块 - 将HTML内容或控件进行修改 [英] HttpModule - get HTML content or controls for modifications

问题描述

试过这样的事情：

  HttpApplication的应用程序= S作为HttpApplication的; // s是OnBeginRequest事件
 System.Web.UI.Page P =（System.Web.UI.Page）app.Context.Handler的发送者; 
 System.Web.UI.WebControls.Label LBL =新System.Web.UI.WebControls.Label（）; 
 lbl.Text =测试测试测试; 
 p.Controls.Add（LBL）; 
  

运行时，这个我得到未设置为一个对象的实例对象引用。最后一行...

我要如何插入特定loactions文本（asp.net/html）的两条线在原来的文件吗？我
和如何找出文件的扩展名（我只希望在ASPX文件...？

解决方案

我不知道，但我不认为你可以使用一个HttpModule改变页面的控件树（请纠正我，如果我错了）。但是，您可以修改HTML标记，你就必须写有响应滤波器为此，有关示例，请参见 http://aspnetresources.com/articles/ HttpFilters.aspx ，或谷歌的HttpModule响应滤波器。

Tried something like this:

HttpApplication app = s as HttpApplication; //s is sender of the OnBeginRequest event
System.Web.UI.Page p = (System.Web.UI.Page)app.Context.Handler;
System.Web.UI.WebControls.Label lbl = new System.Web.UI.WebControls.Label();
lbl.Text = "TEST TEST TEST";
p.Controls.Add(lbl);

when running this I get "Object reference not set to an instance of an object." for the last line...

How do I get to insert two lines of text (asp.net/html) at specific loactions in the original file? And how do I figure out the extension of the file (I only want to apply this on aspx files...?

解决方案

I'm not sure, but I don't think you can use an HttpModule to alter the Page's control tree (please correct me if I'm wrong). You CAN modify the HTML markup however, you'll have to write a "response filter" for this. For an example, see http://aspnetresources.com/articles/HttpFilters.aspx, or google for "httpmodule response filter".

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