Issue using Get-Child-Item

Question

Have a function that will scan (grep) files in a folder with a certain extension.  For some reason, Get-Child-Item always returns empty / 0 files on my folder even though you can look at the folder and see files of the specified extension (*.config).
 Suspect either I am doing something wrong or permissions are somehow getting in the way.  How do you properly use Get-ChildItem
in this context?
function scan-Files
param(
[parameter(mandatory=$True)]
[string]$folder,
[parameter(mandatory=$True)]
[string]$filePattern,
[parameter(mandatory=$False)]
[bool]$recurse = $False
Write-Host "Folder = $folder"
Write-Host "FilePattern = $filePattern"
$files = Get-ChildItem -Include $filePattern -Path $folder
#always empty for some reason
if ($files)
Write-Host "File count = $($files.Length)"
}...#Invoke our function$folder = "C:\Program Files\Microsoft SQL Server\MSRS12.MSSQLSERVER\Reporting Services\ReportServer\"
$filePattern = "*.config"         
#scan-Files -folder $folder -filePattern $filePattern -recurse:$true
scan-Files -folder $folder -filePattern $filePattern

Answer 1

The Gods of the computer demand it.  Without it you are only enumerating a folder item.  With it you are enumerating the contents of the folder.  Include only works on files that have been selected.
Example:
dir 'C:\Program Files\Microsoft SQL Server\MSRS12.MSSQLSERVER\Reporting Services\ReportServer\*.txt' -include *.config
dir 'C:\Program Files\Microsoft SQL Server\MSRS12.MSSQLSERVER\Reporting Services\ReportServer\*.c*' -include *.config
dir 'C:\Program Files\Microsoft SQL Server\MSRS12.MSSQLSERVER\Reporting Services\ReportServer' -filter *.config
Try all to see how they work.
\_(ツ)_/