synchronize master page for application page and site page

The master page of application page is under "_layouts" folder, an example is like MasterPageFile="~/_layouts/application.master". Here is trick to demo how to switch it to the site's master page.

public class SuperBrandingModule : 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) { // Is there a master page defined? if (page.MasterPageFile != null) { // only change the application.master files as those are the offenders if (page.MasterPageFile.Contains("application.master")) { SPWeb site = SPContext.Current.Site.RootWeb; if (site.Properties["CurrentMasterPage"] != null) { string CurrentMasterPage = site.Properties["CurrentMasterPage"]; if (!CurrentMasterPage.Equals(string.Empty)) { page.MasterPageFile = CurrentMasterPage; } } } } } } public void Dispose() { } }