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I want my application to clean all the temp files it used, the problem is that not all the temp files are under my control, so I just want to "brutally" unlock them in order to delete them programatically.
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To create a copy of a file that is read- and/or write-locked by another process on Windows, the simplest (and probably only) solution is to use the Volume Shadow Copy Service (VSS). The Volume Shadow Copy Service is complex and difficult to call from managed code.
Take a look at this article. I think that you'll struggle to do this in C# natively, even using interop, but writing a C++/CLI wrapper assembly may be a good compromise. Note also that the user needs to have the SE_DEBUG privilege for this to work.
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I've struggled with this as well, and ended up just shelling out to Unlocker's command line implementation. In my case it has to run many times daily and ends up unlocking thousands of files per day without any problem.
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