PageMethods不会触发Application_PreRequestHandlerExecute事件。我该怎么用呢？

public class AuthorizationModule : IHttpModule, IRequiresSessionState
{
    //not going to implement it fully, might not compile

    public void Init( HttpApplication context )
    {
       //you\'ll prolly want to hook up to the acquire request state event, but read up to make sure this is the one you want on the msdn
       context.AcquireRequestState += AuthorizeRequest;
    }

    public void AuthorizeRequest( HttpContextBase httpContext )
    {
       // do you work in here

       // you can redirect them wherever if they don\'t have permssion, log them out, etc
    }
  }
}

<httpModules>
  <add name=\"AuthorizationModule\" type=\"AuthorizationModule\"/>
</httpModules>

public void Application_OnPostAuthenticateRequest(object sender, EventArgs e)
{

    IPrincipal usr = HttpContext.Current.User;

    if (usr.Identity.IsAuthenticated && usr.Identity.AuthenticationType == \"Forms\")
    {
        var fIdent = (FormsIdentity)usr.Identity;
        var ci = new CustomIdentity(fIdent.Ticket);
        var p = new CustomPrincipal(ci);

        HttpContext.Current.User = p;
        Thread.CurrentPrincipal = p;
    }

}