Editing CSS or JS file restarts the application

[dannystommen]

Hi guys,

Sometimes (I believe it's completely random) the application is ended and restarted when I edit some CSS of JS file and refresh the browser (all localhost).

After logging the _shutDownMessage and _shutDownStack using the following code

        HttpRuntime runtime = (HttpRuntime)typeof(System.Web.HttpRuntime).InvokeMember("_theRuntime", BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.GetField, null, null, null);

        if (runtime == null)
          return;

        string shutDownMessage = (string)runtime.GetType().InvokeMember("_shutDownMessage", BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.GetField, null, runtime, null);

        string shutDownStack = (string)runtime.GetType().InvokeMember("_shutDownStack", BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.GetField, null, runtime, null);

        //wirte to custom logger
        Logger.Instance.Debug(string.Format("\r\n\r\n_shutDownMessage={0}\r\n\r\n_shutDownStack={1}", shutDownMessage, shutDownStack));

it results in the following log:

_shutDownMessage=Change in App_Offline.htm
HostingEnvironment initiated shutdown
Change in App_Offline.htm
Change in App_Offline.htm
Change in App_Offline.htm
HostingEnvironment caused shutdown

_shutDownStack=   at System.Environment.GetStackTrace(Exception e, Boolean needFileInfo)
   at System.Environment.get_StackTrace()
   at System.Web.Hosting.HostingEnvironment.InitiateShutdownInternal()
   at System.Web.Hosting.HostingEnvironment.InitiateShutdownWithoutDemand()
   at System.Web.HttpRuntime.ShutdownAppDomain(String stackTrace)
   at System.Web.HttpRuntime.ShutdownAppDomainWithStackTrace(ApplicationShutdownReason reason, String message, String stackTrace)
   at System.Web.HttpRuntime.ShutdownAppDomain(ApplicationShutdownReason reason, String message)
   at System.Web.HttpRuntime.OnAppOfflineFileChange(Object sender, FileChangeEvent e)
   at System.Web.DirectoryMonitor.FireNotifications()
   at System.Web.Util.WorkItem.CallCallbackWithAssert(WorkItemCallback callback)
   at System.Web.Util.WorkItem.OnQueueUserWorkItemCompletion(Object state)
   at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()

Any idea why editing a CSS or JS file results in a change of 'app_offline.htm'?

[dglienna]

Because you shut down ASP.Net. Hit Control-F5 to start it again.

[dannystommen]

What do you mean with "shutdown ASP.Net"? I didn't stop it. While running I just edit some CSS or JS file inside VS2010.

And why does the application restart only sometimes?