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I use [System.IO.Directory]::EnumerateDirectories() in PowerShell instead of get-child item mainly because it is faster. But I have noticed that on a System.UnauthorizedAccessException exception returns only the first exception.

Is that a bug, or am I doing something wrong?

I use [System.IO.Directory]::EnumerateDirectories() in PowerShell instead of get-child item mainly because it is faster. But I have noticed that on a System.UnauthorizedAccessException exception returns only the first exception.

Is that a bug, or am I doing something wrong?

• powershell
• exception

Share Improve this question Follow edited Jan 21 at 13:17 dthorbur 1,10133 gold badges1313 silver badges2626 bronze badges asked Jan 21 at 11:02 ZaverZaver 933 bronze badges 2

• 2 Please, DO NOT post images of code, data, error messages, etc., see How do I ask a good question? – iRon Commented Jan 21 at 11:15
• We pretty much NEVER want to see a screen shot of your terminal here. – Joel Coehoorn Commented Jan 21 at 15:43

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1 Answer 1

Sorted by: Reset to default 1

Not a bug, it's the expected behavior of a .NET class method, when there is an error it throws, thus ending the enumeration.

A very easy way to demo this without needing to compile C# code:

# NOTE: If you were to use the workaround shown for PowerShell 5.1
#       using the `while` loop you could enumerate this completely.

$enumerable = [System.Linq.Enumerable]::Select(
    [System.Linq.Enumerable]::Range(0, 10),
    [System.Func[int, int]] {
        if ($args[0] -ne 5) { return $args[0] }
        throw 'woops' })

foreach ($i in $enumerable) { $i }

The concept of a non-terminating error only exists for PowerShell commands, however there are workarounds for your issue.

• In PowerShell 7+, the easiest way to handle it, is to use the EnumerationOptions class:

  # NOTE:
  #    - Sets `IgnoreInaccessible` to `true` by default
  #    - By default skips Hidden and System. To not skip those use:
  #      `AttributesToSkip = [System.IO.FileAttributes]::None`
  
  [System.IO.Directory]::EnumerateDirectories(
      'E:\test2', '*',
      [System.IO.EnumerationOptions]@{ RecurseSubdirectories = $true })
  

• In PowerShell 5.1, the class used above doesn't exist in .NET Framework, thus more work is needed. What you can do here is to manually enumerate your enumerable:

  $enumerable = [System.IO.Directory]::EnumerateDirectories(
      'E:\test2', '*',
      [System.IO.SearchOption]::AllDirectories)
  
  $enumerator = $enumerable.GetEnumerator()
  
  while ($true) {
      try {
          # we're done if this is true
          if (-not $enumerator.MoveNext()) {
              break
          }
  
          $enumerator.Current
      }
      catch {
          # PowerShell always wraps method exceptions in `MethodInvocationException`,
          # it's safe to use `.InnerException` in this case
          Write-Error -Exception $_.Exception.InnerException
      }
  }
  

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