Binding to HttpApplication events

    It is not necessary to override and replace the UmbracoApplication. If you consider changing the default global.asax, read on!

    Umbraco allows you to bind directly to HttpApplication events which is very handy since normally you would require an HttpModule to bind to these types of events.

    The HttpApplication events are listed here: https://msdn.microsoft.com/en-us/library/system.web.httpapplication_events.aspx

    In order to bind to these events you need to first listen to the UmbracoApplicationBase.ApplicationInit event. Here is an example:

    using Umbraco.Core;
using Umbraco.Core.Events;
using Umbraco.Core.Logging;
using Umbraco.Core.Models;
using Umbraco.Core.Services;

namespace MyProject.EventHandlers
{
    public class RegisterEvents : ApplicationEventHandler
    {
        protected override void ApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
        {
            //Listen for the ApplicationInit event which then allows us to bind to the
            //HttpApplication events.
            UmbracoApplicationBase.ApplicationInit += UmbracoApplicationBase_ApplicationInit;
        }

        /// <summary>
        /// Bind to the events of the HttpApplication
        /// </summary>
        void UmbracoApplicationBase_ApplicationInit(object sender, EventArgs e)
        {
            var app = (HttpApplication) sender;
            app.PostRequestHandlerExecute += UmbracoApplication_PostRequestHandlerExecute;
        }

        /// <summary>
        /// At the end of a handled request do something...
        /// </summary>
        void UmbracoApplication_PostRequestHandlerExecute(object sender, EventArgs e)
        {
            //Do something...
        }
    }
}

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