Powershell Where-Object -in子句

Question

I am attempting to delete some orphaned folders. I have a list of folder names that are orphaned, and I am attempting to find the corresponding File object. Unfortuantely, I can't seem to get the -in clause to work as I would expect.

A slightly contrived example:

$orphans = ls | select Name
ls | ?{$_.Name -in $orphans}
ls -Include $orphans

No files are returned.

Answer 1

In order for this to work you need to do

$orphans = ls | select -ExpandProperty Name

Or inside the Where-Clause

ls | ?{$_.Name -in $orphans.name}

$orphans in your code is an object array with a name property. Break that property out into a simple string array and you should get the results you expect.

I will also assume that the code sample is just that... a sample. That code, once working correctly, seems redundant.

Powershell v2

The above code didn't work on Powershell v2. A combination of -ExpandProperty and -contains seemed to correct the issue:

$orphans = ls | select -ExpandProperty Name
ls | ?{$orphans -contains $_.Name}