I have read this article http://weblogs.asp.net/scottgu/archive/2009/09/15/auto-start-asp-net-applications-vs-2010-and-net-4-0-series.aspx about auto-start mode in asp.net4.0 and still don't understand is application_start event fired on application warm-up or not? Article said that application are automaticaly preloaded with the logic, described in class, registered as serviceAutoStartProvider. But what about application start, is "preloaded" means that application_start also fires, or it fires only after preloading on first request?
The event Application_Start is not fired by the IIS AutoStart feature. It is still fired upon first request.
You may check that the application is ready in "Application_Start" and run the init code if you find it is not. This way the application is compatible with IIS Express (it does not support AutoStart) and IIS 7.5.
Related
I've notice that on the production server, my asp.net 4.7.2 application is very slow. By debugging I've found that in global.asax the Application_start and Application_end is called on every request, causing a recompile of the application each time and slowing down the response.
I0ve test it on several servers and the behaviour is always the same.
Running the website on localhost in IIS (not iis express) this not happen.
How can I check why Application_End is called and from where?
Debugging in VS the Application_end stacktrace is empty, I cannot see from where is called.
Thanks
The problem was cause by Kaspersky Endpoint Security for Windows Server version 11.0.0.480.
For some unknown reason it act on w3wp.exe causing the application restart on each requests. The only way to solve the problem is excluding w3wp.exe from the monitored applications/processes.
There are many circumstances when the Application_end will be called, such as application pool's recycle, web.config file's change, or bin file's change. For more detailed information about Application_end be called you need to check the Event log in the sever.
I implement some code in Application_Start and Application_End (global.asax).
When i start ASP.NET Developer Server the Application_Start run normally.
When i change the web.config file, the method Application_Start is called again but Application_End is never called.
Someone know how can i force Application_End run before the second call to Application_Start
Is Application_End not being called or is it that a break point in Application_End is not being hit?
Application_End is called when the application pool is stopped.
When you are debugging you are attached to the application pool process.
What may be happening is that the debugger looses contact with the application pool before the Application_End is called, and you are therefore not hitting the break point.
My code opens a server socket in Application_Start, so Visual Studio couldn´t restart my application whitout closing it.
For safety VS don´t restart my Application.
VS calls Application_End only if he knows that noone is affected.
In my case i could be using the socket to sending or receiving data.
I've got an application that needs to do some work on startup (before the first request is in).
I've added the initialization code in the global.asax file (Application_start method) but this code doesn't seem to be hit after an iis reset is performed.
Is there an event which is triggered in an asp.net application when an iis reset has occurred?
Thanks.
Application start happens on first request, not on iisreset.
The site doesn't start itself..
See "Restart cache item callback on web process restart" here.
In such cases, the service will stop
running unless a page is hit and the
Application_Start is called.
Application_Start is called only when
a page is visited for the first time
in a web project.
I would suggest having a batch file that contains iisreset and an "iexplore mypage" call
Edit: apparently, you can use application end to trigger application start. YMMV
http://weblogs.asp.net/scottgu/archive/2009/09/15/auto-start-asp-net-applications-vs-2010-and-net-4-0-series.aspx
This may be of help to you.
Tho the features are new to IIS 7.5 which is only on Windows Server 2008 R2 / Windows 7.
Auto-Start Web Applications with ASP.NET 4
Some web applications need to load large amounts of data, or perform expensive initialization processing, before they are ready to process requests. Developers using ASP.NET today often do this work using the “Application_Start” event handler within the Global.asax file of an application (which fires the first time a request executes). They then either devise custom scripts to send fake requests to the application to periodically “wake it up” and execute this code before a customer hits it, or simply cause the unfortunate first customer that accesses the application to wait while this logic finishes before processing the request (which can lead to a long delay for them).
ASP.NET 4 ships with a new feature called “auto-start” that better addresses this scenario, and is available when ASP.NET 4 runs on IIS 7.5 (which ships with Windows 7 and Windows Server 2008 R2). The auto-start feature provides a controlled approach for starting up an application worker process, initializing an ASP.NET application, and then accepting HTTP requests.
Edit: Link to more information about Auto Start feature.
http://www.asp.net/LEARN/whitepapers/aspnet4#0.2__Toc253429241
Not using Cassini, but IIS7 to run an ASP.NET app.
The debug behavior is flakey. Sometimes it works, sometimes it doesn't. I was able to step into the application start event in global.asax but sometimes I can't.
Sometimes VS2008 opens the published global.asax so I have two instances of global.asax opened in VS, the source and the published.
I reset the AppDomain and IIS and I can't put my finger on why this is happening. Any clues?
To add, while it won't go into application start, I have an OnChangeEventHandler event - it does step into the event handler.
Visual Studio doesn't connect to w3wp.exe soon enough to handle breakpoints in Application_Start for IIS7-hosted applications. To debug, use the following line to call debugger explicitly,
System.Diagnostics.Debugger.Launch();
and choose to launch a new instance of Visual Studio.
make a change in the web.config, the application pool will recycle and the global.asax code will be loaded, the debugger should still be attached
I'm trying to debug something in the global.asax.cs file in an ASP.NET web app and have set a breakpoint in the Application_Start() event however that event is not getting fired when I start the web app inside VS2008. I'm targeting the 3.5 framework.
What could prevent this event from being fired? Or how could I have messed up the project such that this event is no longer wired up?
One easy trick to debug newly written code in the global.asax file is to save the web.config file. Each time the config.file is saved, the application is stopped and started.
You could find useful information in this blog entry
Workaround: Debugging Global.aspx.cs Application_Start() with ASP.Net Web Server within Visual Studio
The reason behind this is that we do
not kill the ASP.Net Web Server
process after your every debug run and
hence Application_Start() is not fired
every time. There is a good reason
why we do so... Starting ASP.Net Web
Server process is an expensive task
and in most of the scenarios recycling
this process after every debug would
adversely impact your performance...
If you do not want to debug your
Application_Start() method then
probably you do not need to have the
process restart and save performance
most of the time...
One of the proposed workarounds:
You can go to your property pages of
your web application and enable Edit &
Continue like shown below:
(from the Visual Web Developer Team Blog)
If i remember correctly, Application_Start runs before the debugger can hook up to the application.
Try doing something else to check if the Application_Start method runs, like setting an application variable:
Application("app") = "started"
Then display the application variable in the page to see if it was set.