HttpModules

HttpModules sit in the ASP.NET processing pipeline and can listen for events during the processing lifecycle. Modules are good solutions when the behavior you want to achieve is orthogonal to the page processing. For instance, authentication, authorization, session state, and profiles are all implemented as HttpModules by the ASP.NET runtime. You can plug-in and remove these modules to add or discard their functionality. Here is a module to set the MasterPageFile property on every Page object.


using System;
using System.Web;
using System.Web.UI;

public class MasterPageModule : IHttpModule
{
public void Init(HttpApplication context)
{
context.PreRequestHandlerExecute += new EventHandler(context_PreRequestHandlerExecute);
}

void context_PreRequestHandlerExecute(object sender, EventArgs e)
{
Page page = HttpContext.Current.CurrentHandler as Page;
if (page != null)
{
page.PreInit +=new EventHandler(page_PreInit);
}
}

void page_PreInit(object sender, EventArgs e)
{
Page page = sender as Page;
if (page != null)
{
page.MasterPageFile = "~/Master1.master";
}
}

public void Dispose()
{
}
}