.NET 3.5 - System.Reflection.Assembly does not release object (DLL) after use
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From: Wolfixx on 31 Mar 2010 21:20 Hello, Does anyone of you know how I can force vb.net to remove the handle of a local DLL which I used beforehand with Reflection. Here is a fragment of the code. I have a base class and a derived class. This app only knows the base class and creates an Instance of the derived class by using Reflection which works fine. The only problem I have is that the local DLL file is blocked (I can't delete it) as long as I don't close the Application Dim GetCustomModule as BaseClass Dim dll As Assembly = Assembly.LoadFrom("c:\tools\DerivedCass.dll") For Each assemblytype As System.Type In dll.GetExportedTypes If assemblytype.ToString = "tools" Then GetCustomModule = DirectCast(Activator.CreateInstance(assemblytype), BaseClass) End If Next .... do something with the Class and then get rid of it .... dll = Nothing 'now the file c:\tools\DerivedCass.dll is still locked and I can't delete it. Forcing Garbage Collector to run doesn't help at all. I can see through Sysinternals\ProcessExplorer that AppName.vshost.exe has still a handle on that file. Thanks for any help Wolfgang
From: Wolfixx on 9 Apr 2010 00:27
"Armin Zingler" <az.nospam(a)freenet.de> wrote in message news:O$Kj#sY0KHA.776(a)TK2MSFTNGP04.phx.gbl... > Am 01.04.2010 03:20, schrieb Wolfixx: >> Hello, >> >> Does anyone of you know how I can force vb.net to remove the handle of a >> local DLL which I used beforehand with Reflection. > > Look at the big "Note" in the middle: > http://msdn.microsoft.com/en-us/library/2bh4z9hs.aspx > > I've no experience with it but maybe you find something > in the neighbour topics (about assemblies and application domains). > > -- > Armin Thanks Armin that seems to be a design limitation then. Wolfgang |