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  • HC Saustrup 28 posts 79 karma points
    May 16, 2013 @ 12:13
    HC Saustrup
    0

    Observing BeginRequest (and friends) with IApplicationEventHandler in 6.0.5

    Hi!

    I'm trying to hook onto the BeginRequest event in Umbraco 6.0.5, but it crashes when I try to add the event handler to UmbracoApplicationBase.BeginRequst:

    [NullReferenceException: Object reference not set to an instance of an object.]
       System.Web.PipelineStepManager.ResumeSteps(Exception error) +1239
       System.Web.HttpApplication.BeginProcessRequestNotification(HttpContext context, AsyncCallback cb) +95
       System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +186

    This is my code:

    public class Foobar : IApplicationEventHandler
    {
    public void OnApplicationInitialized(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
    {
    LogHelper.Info<Foobar>("Initialized");
    }
    public void OnApplicationStarting(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
    {
    LogHelper.Info<Foobar>("Starting");
    }
    public void OnApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
    {
    LogHelper.Info<Foobar>("Started");
    umbracoApplication.BeginRequest += (object sender, EventArgs e) =>
    {
    };
    } }
    Obviously I'm doing something wrong - any clues? :-)
  • HC Saustrup 28 posts 79 karma points
    May 16, 2013 @ 14:10
    HC Saustrup
    0

    Tried to do this with Global.asax.cs and Umbraco.Web.UmbracoApplication, but the result is the same. It seems the error is triggered when the handler is called.

     

    Code:

    public class UmbracoApplication : Umbraco.Web.UmbracoApplication
    {
        protected override void OnApplicationStarted(object sender, EventArgs e)
        {
            LogHelper.Info("Started");
            base.OnApplicationStarted(sender, e);
    
            // Same result without the EventHandler wrapper:
            this.BeginRequest += new EventHandler(UmbracoApplication_BeginRequest);
            LogHelper.Info("Event handler added");
        }
    
        private void UmbracoApplication_BeginRequest(object sender, EventArgs e)
        {
        }
    }
    

    Log:

    2013-05-16 14:06:24,526 [10] INFO  Umbraco.Site.UmbracoApplication - [Thread 76] Started
    2013-05-16 14:06:24,526 [10] INFO  Umbraco.Site.UmbracoApplication - [Thread 76] Event handler added
    

    Error:

    [NullReferenceException: Object reference not set to an instance of an object.]
       System.Web.PipelineStepManager.ResumeSteps(Exception error) +1239
       System.Web.HttpApplication.BeginProcessRequestNotification(HttpContext context, AsyncCallback cb) +95
       System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +186
    
  • HC Saustrup 28 posts 79 karma points
    May 16, 2013 @ 14:32
    HC Saustrup
    0

    Found something that worked when extending Umbraco.Web.UmbracoApplication (but unfortunately not IApplicationEventHandler): Ignore the EventHandler properties and implement handler methods prefixed with "Application_", like so:

    public void Application_BeginRequest(object sender, EventArgs e)
    {
    // ...
    }

     

    Now if only I could figure out how to do that when implementing IApplicationEventHandler :-/

  • HC Saustrup 28 posts 79 karma points
    May 16, 2013 @ 14:42
  • HC Saustrup 28 posts 79 karma points
    May 21, 2013 @ 10:16
    HC Saustrup
    0

    Anyone?

  • Martin Meixger 17 posts 74 karma points
    May 20, 2015 @ 11:30
    Martin Meixger
    2
    public class Foobar : IApplicationEventHandler {
        public void OnApplicationInitialized(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext) {
            LogHelper.Info<Foobar>("Initialized");
        }
    
        public void OnApplicationStarting(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext) {
            LogHelper.Info<Foobar>("Starting");
        }
    
        public void OnApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext) {
            LogHelper.Info<Foobar>("Started");
    
            // In ASP.NET there can by multiple instances of the HttpApplication.
            // The ApplicationInit event will be raised on every HttpApplication.Init()
            UmbracoApplicationBase.ApplicationInit += Init;
        }
    
        private void Init(object sender, EventArgs eventArgs) {
            var app = (HttpApplication) sender;
            app.BeginRequest += (s, e) => { };
        }
    }
    
  • Simon Dingley 1412 posts 3272 karma points c-trib
    Oct 24, 2018 @ 12:32
    Simon Dingley
    0

    Thanks for sharing this Martin! I've been trying to tap into the BeginRequest event and my attempts were unsuccessful until I tried this.

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