Q.yuhen

HttpApplication app = HttpContext.Current.ApplicationInstance;

foreach (string m in app.Modules.AllKeys)
    app.Response.Write(app.Modules[m].ToString() + "<br>");    

输出(ASP.NET 2.0)
System.Web.Caching.OutputCacheModule
System.Web.SessionState.SessionStateModule
System.Web.Security.WindowsAuthenticationModule
System.Web.Security.FormsAuthenticationModule
System.Web.Security.PassportAuthenticationModule
System.Web.Security.RoleManagerModule
System.Web.Security.UrlAuthorizationModule
System.Web.Security.FileAuthorizationModule
System.Web.Security.AnonymousIdentificationModule
System.Web.Profile.ProfileModule
System.Web.Mobile.ErrorHandlerModule
System.Web.Security.DefaultAuthenticationModule

东西还不少，Windows验证、Forms验证、Passport验证，连那个角色授权(System.Web.Security.Roles)都是内置的。晕~~~~

请注意，HttpApplication 和 HttpApplicationState 不是一回事。后者用来保存 ASP.NET 应用程序中多个会话和请求之间的全局信息共享，就是 Page.Application 和 HttpContext.Current.Application。