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View Thread: Does Parallel.ForEach only return when ALL iterations have completed?
  • felix9

    this MIGHT be relevant ?

    The file / folder is NOT guranteed to be deleted right after DeleteFile returns and succeeded.

    http://blogs.msdn.com/b/oldnewthing/archive/2012/09/07/10347136.aspx

    However, the NT model for file deletion is that a file is deleted when the last open handle is closed.Ā¹ If DeleteĀ­File returns and the file still exists, then it means that somebody else still has an open handle to the file.

    I think maybe you can trace the exact problem with ProcessMonitor.