From: Miguel de Icaza <[EMAIL PROTECTED]> To: Jörg Rosenkranz <[EMAIL PROTECTED]> CC: [EMAIL PROTECTED] Subject: Re: [Mono-list] Workaround for AppDomain.Load + Unload problem? Date: 27 Aug 2003 18:08:23 -0400
Hello,
> We are creating an application which should be able to load and > unload assemblies at runtime to update parts of it dynamically. > To unload an assembly you have to unload the AppDomain which > is running it. Now there is a problem in loading and unloading > AppDomains: > http://bugzilla.ximian.com/show_bug.cgi?id=47659 > > Has someone done something similar and got around this problem? > Is there maybe any workaround?
.NET does not support unloading assemblies. It is not an easy problem to fix (neither in .NET nor in Mono).
Miguel
That´s is why most auto-updating solutions, use the AppDomain.ShadowCopyFiles property, that makes the appdomain copy all the files that are needed to be loaded to a shadow directory, and load them from there, leaving the original files available to be superseded. The biggest problem is that you one of two choices: if you want to guarantee the user is running the latest version always, you need to wait for all assemblies being updated before entering the main program (in that case you may not even use ShadowCopyFiles), or the update occurs in the background but the user will view it reflected only the next time it enters the application.
Good Hacking Habits,
Rafael Teixeira Brazilian Polymath Mono Hacker since 16 Jul 2001
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