Powershell class first instance misbehaving - powershell

Question

I am getting my feet wet with PS classes, by trying to implement a path type identifier class. Basically I want to pass a string in and identify variations on file system and registry paths. Mostly it is working, but oddly the first item I test, no matter what it is, the properties are blank when I look, though no error shows up. And it seems like the results are actually from the previous instance, at least for the "successful" instances. Thrown exceptions seem to be working as expected. So, when $test = #('C:\folder', 'D:\', 'C:', 'K:', '\\Server\Folder\*', '\junk', '?:'), my results will be
C:\folder
D:\
FileSystem_Folder
LocalDisk folder
C:
FileSystem_Drive
OpticalDisk drive
K:
FileSystem_Drive
LocalDisk drive
\\Server\Folder\*
FileSystem_Drive
Unknown drive
! \junk
Not Identified: \junk
! ?:
Not Identified: ?:
This is the code in question.
class PxPath {
# Properties
hidden [array]$validPathTypes = #('FileSystem_Drive', 'FileSystem_Folder', 'FileSystem_File', 'Registry_Key', 'Registry_Property')
hidden [hashtable]$regExLookup = #{
registryHive = '^(?<hive>HKCC|HKEY_CURRENT_CONFIG|HKCR|HKEY_CLASSES_ROOT|HKCU|HKEY_CURRENT_USER|HKLM|HKEY_LOCAL_MACHINE)(?<seperator>:)?$'
registryPath = '^(?<hive>HKCC|HKEY_CURRENT_CONFIG|HKCR|HKEY_CLASSES_ROOT|HKCU|HKEY_CURRENT_USER|HKLM|HKEY_LOCAL_MACHINE)(?<seperator>:)?\\(?<remainder>.+)$'
fileSystemDriveOnly= '^(?<drive>[a-zA-Z]:)(\\)?$'
fileSystemDrivePath = '^(?<drive>[a-zA-Z]:)\\(?<remainder>.+)$'
fileSystemUNCPath = '^(?<server>\\\\[^<>:"/\\\|]*)\\(?<remainder>.+)$'
}
hidden [hashtable]$driveTypeLookup = #{
0 = 'Unknown'
1 = 'NoRootDirectory'
2 = 'RemovableDisk'
3 = 'LocalDisk'
4 = 'NetworkDrive'
5 = 'OpticalDisk'
6 = 'RamDisk'
}
[string]$Description = $null
[string]$Type = $null
# Constructors
PxPath ([string]$path) {
$this.PathType($path)
}
PxPath ([string]$path, [string]$pathType) {
if ($this.validPathTypes -contains $pathType) {
$this.PathType($path)
if ($this.Type -ne $pathType) {
Throw "$($this.Type) does not match: $pathType"
}
} else {
Throw "Not a valid path type: $pathType"
}
}
hidden [void] PathType ([string]$path) {
[string]$driveType = $null
[string]$extension = $null
[string]$extension = $null
switch -regex ($path) {
$this.regExLookup.fileSystemDriveOnly {
$driveType = $this.driveTypeLookup.Get_Item([int](Get-WmiObject Win32_LogicalDisk -computerName:. -filter:"name='$($matches.drive)'" | Select DriveType).DriveType)
$this.Description = "$driveType drive"
$this.Type = 'FileSystem_Drive'
}
$this.regExLookup.fileSystemDrivePath {
$driveType = $this.driveTypeLookup.Get_Item([int](Get-WmiObject Win32_LogicalDisk -computerName:. -filter:"name='$($matches.drive)'" | Select DriveType).DriveType)
if ($extension = [System.IO.Path]::GetExtension($path)) {
$this.Description = "$driveType file"
$this.Type = 'FileSystem_File'
} else {
$this.Description = "$driveType folder"
$this.Type = 'FileSystem_Folder'
}
}
$this.regExLookup.fileSystemUNCPath {
if ($extension = [System.IO.Path]::GetExtension($path)) {
$this.Description = "UNC file"
$this.Type = 'FileSystem_File'
} else {
$this.Description = "UNC folder"
$this.Type = 'FileSystem_Folder'
}
}
$this.regExLookup.registryPath {
}
default {
Throw "Not Identified: $path"
}
}
}
}
CLS
$test = #('C:\folder', 'D:\', 'C:', 'K:', '\\Server\Folder\*', '\junk', '?:')
foreach ($testitem in $test) {
$path = try {
[PxPath]::New($testitem)
Write-Host $testitem
Write-Host " $($path.Type)"
Write-Host " $($path.Description)"
Write-Host
} catch {
Write-Host "! $testitem"
Write-Host " $($_.Exception.Message)"
Write-Host
}
}
I suspect the issue is something I just don't understand with classes, but I guess a bug in PowerShell that I need to work around could also be the culprit.