FCMode + 'dir change or directory rename' RSS

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  hitchhiker999

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  FCMode + 'dir change or directory rename'

  Aug 26, 2008 04:37 PM|LINK

  I'm having trouble with disabling File Change Notification on my .NET 2 / 3.5 webserver. I have an app that removes directories once in a while, every time that happens I get 'dir change or directory rename HostingEnvironment initiated shutdown'

  I put this key in, as instructed - then rebooted.

  [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ASP.NET]
  "FCNMode"=dword:00000001

  -Is it in the wrong place, when I delete a directory the site still recycles? 
  

  Also:
  

  -Is there any way to switch of FCN programatically via my global.asax or any other method?
  -If so would setting up my own FCN service (that just monitors certain config files) and using 'System.Web.HttpRuntime.UnloadAppDomain();' be identical to the native one?
  

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  hitchhiker999

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  Re: FCMode + 'dir change or directory rename'

  Aug 26, 2008 06:42 PM|LINK

   I found this somewhere on your site, which solved it:

   

  //FIX disable AppDomain restart when deleting subdirectory
  
  //This code will turn off monitoring from the root website directory.
  
  //Monitoring of Bin, App_Themes and other folders will still be operational, so updated DLLs will still auto deploy.
  
  System.Reflection.PropertyInfo p = typeof(System.Web.HttpRuntime).GetProperty("FileChangesMonitor", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Static);
  
  object o = p.GetValue(null, null);
  
  System.Reflection.FieldInfo f = o.GetType().GetField("_dirMonSubdirs", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.IgnoreCase);
  
  object monitor = f.GetValue(o);
  
  System.Reflection.MethodInfo m = monitor.GetType().GetMethod("StopMonitoring", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic); m.Invoke(monitor, new object[] { });
  

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  Bruce L

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  Re: FCMode + 'dir change or directory rename'

  Aug 26, 2008 06:47 PM|LINK

  I think the path of the registry key is correct.

  Have you tried restart IIS and see if the new setting takes?

  I don't believe you can switch off file change notification programatically.

  Bruce
  
  http://www.discountASP.NET
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  hitchhiker999

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  Re: FCMode + 'dir change or directory rename'

  Aug 27, 2008 08:06 AM|LINK

  I had rebooted actually, but it's fine now..

  The above code, when attached to my global.asax (app start), stopped file change notifications only on the sub dirs - it was the perfect solution as touching web.config or /bin/ still correctly causes a refresh.
  

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  bernesto

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  Re: FCMode + 'dir change or directory rename'

  Jan 04, 2009 05:18 AM|LINK

  Thanks for the awesome piece of code. In my tests, without the code, deleting a directory causes the application to restart, with the code it does not. Touching the web.config or the bin still causes the application to restart.
  

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  hitchhiker999

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  Re: FCMode + 'dir change or directory rename'

  Jan 06, 2009 06:27 PM|LINK

   Yep, that's the experience I have.. I've now been using it since I posted it and it's been working flawlessly..
  

   I can't believe this isn't mentioned more, considering the nature of most web apps these days, this is a serious issue - app restarts cause many issues eg: a user uploads an image and the temp file is located within the app dir (which it may be for a lot of people) the app loses it's state!

   

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  ibolden

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  Re: FCMode + 'dir change or directory rename'

  Feb 12, 2010 02:59 PM|LINK

  hitchhiker999,

  Thanks for posting on this. We had the same issue. We developed a control as a webbased file explorer. In testing, everytime the user deleted a folder, session was killed. This post, your code, fixed our issues.

  Just wanted to say thanks.

   

  ~Ian

  Session .ASPX

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  ManicStudio

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  Re: FCMode + 'dir change or directory rename'

  Feb 22, 2010 11:25 AM|LINK

  This only works in full trust. What about shared hosting server that runs in medium trust level?

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  vindy

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  Re: FCMode + 'dir change or directory rename'

  Aug 31, 2010 02:58 PM|LINK

  Hi Hitchhiker999

  the following code returns null f.GetValue(o); any idea why this is happening
  

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  hitchhiker999

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  Re: FCMode + 'dir change or directory rename'

  Aug 31, 2010 09:22 PM|LINK

  Hey Vindy - no idea, but I assume it's either due to Trust levels or Framework version?