Windows Service That Deletes Contents of C:\Windows\Temp - windows

Question

I have windows service written in vb.net that deletes the contents of a folder (meaning all files, subfolders, and files) in that folder every few minutes.
I need to change the service so that it now deletes the contents of the C:\Windows\Temp folder.
When I edit the path in the service, then recompile, and re-install, the service does not delete the contents of C:\Windows\Temp
I even added code to handle any open/locked files so that the deletion process would just continue, but still nothing.
Sub ClearWinTempDirectory(folder As String)
'Loop over the subdirectories and remove them with their contents
For Each d In Directory.GetDirectories(folder)
Directory.Delete(d, True)
Next
' Finish removing also the files in the root folder
For Each f In Directory.GetFiles(folder)
Try
File.Delete(f)
Catch e As System.IO.IOException
Console.WriteLine(e.Message)
End Try
Next
COBWtl.WriteEntry("All files and folders in the " & folder & " directory that
are not currently locked by applications or processes Have been deleted",
EventLogEntryType.Information, eventID:=9995)
End Sub
I am hoping someone can help me identify why this service does not work when pointed to C:\Windows\Temp but it works without incident when deleting files and folders in C:\MyTestFolder.
My service runs as LocalSystem and SYSTEM has full control on C:\Windows\Temp
I also changed it to run as an administrator account, but that doesn't work either.
I can put the same code into a non-service exe and double click it, and it works and deletes the contents of C:\Windows\Temp -- so I am at a complete loss and hope someone can point me in the right direction on how to figure out what is wrong.
I provided process monitor results, which appear to show the service is accessing C:\windows\temp which is confusing because I put some test files out there that are not open or held up in a process, and those are not being deleted.
Native Process Monitor PML Results File
Process Monitor Extended Results XML File

Answer 1

I was able to fix my own problem. Here is what I found:
The service was successfully accessing C:\Windows\Temp but it was failing due to two exceptions:
1) Permissions Exception where it was denied access to a subfolder or file as a result of permissions
2) IO Problem because the file was open or in use.
In my code, I was only checking for System.IO.Exceptions so when it encountered an Access Failure exception it would break.
Once I discovered this, I modified the exception handling on the catch so that it would check for all exceptions.
Hence the code changed from what it was as listed above to this.
Sub ClearWinTempDirectory(folder As String)
'Loop over the subdirectories and remove them with their contents
For Each d In Directory.GetDirectories(folder)
Try
Directory.Delete(d, True)
Catch e As System.Exception
COBWtl.WriteEntry("The directory " & d & " is
currently locked or is inaccessable and will not be deleted.",
EventLogEntryType.Information, eventID:=9997)
End Try
Next
' Finish the files in the root folder
For Each f In Directory.GetFiles(folder)
Try
File.Delete(f)
Catch e As System.Exception
COBWtl.WriteEntry("The file " & f & " in directory " & folder
& " is currently locked or is inaccessable and will not be
deleted.", EventLogEntryType.Information, eventID:=9997)
End Try
Next
COBWtl.WriteEntry("All files and folders in the " & folder & "
directory that are not currently locked by applications or processes
Have been deleted", EventLogEntryType.Information, eventID:=9995)
End Sub
Problem solved.