having issues recording error in export-csv - powershell

Question

I have powershell script to pull down hotfixID, installedon, lastbootuptime and freespace in C drive. (I googled around and changed couple of things I need.) when the Pc is not reachable it will
Write-Warning "$_ cannot be reached, skipping."
I also want to capture the computer name of the failed PC to my CSV. I tried
| Export-Csv C:\test\computerDetails.csv -NoTypeInformation
or append but seems like its not working. can someone please help? below is my whole script.
(Get-Content C:\test\serverlist.txt).Trim() | ForEach {
If (Test-Connection -ComputerName $_ -Count 1 -Quiet)
{
$update = Get-CimInstance Win32_QuickFixEngineering -ComputerName $_ | Sort-Object InstalledOn -Descending | Select-Object -First 1
$os = Get-CimInstance win32_operatingsystem -ComputerName $_
$disk = Get-WmiObject Win32_LogicalDisk -ComputerName $_ -Filter "DeviceID='C:'"
$props = #{
ComputerName = $_
HotFixID = $update.HotFixID
InstalledOn = $update.InstalledOn
lastbootuptime = $os.LastBootUpTime
FreeSpace_GB = $disk.FreeSpace / 1GB
}
New-Object PsObject -Property $props
}
Else {
Write-Warning "$_ cannot be reached, skipping." | Export-Csv C:\test\computerDetails.csv -NoTypeInformation
}
} | Sort ComputerName |
Select ComputerName,HotFixID,InstalledOn,lastbootuptime,FreeSpace_GB |
Export-Csv C:\test\computerDetails.csv -NoTypeInformation

Answer 1

Main problem with adding it to the CSV is that it is a string. If you treat the erroneous machines the same as successful ones, then you can throw them in the same CSV.
I have added an ArrayList there as the storage variable and then for each computer it creates a temp PSObject to store your results in, overwriting the variable each loop but not before dumping the variable into the ArrayList for export at the end.
$Errors = New-Object System.Collections.ArrayList
(Get-Content C:\test\serverlist.txt).Trim() | ForEach {
$Temp = New-Object -TypeName PSObject
If (Test-Connection -ComputerName $_ -Count 1 -Quiet) {
$update = Get-CimInstance Win32_QuickFixEngineering -ComputerName $_ | Sort-Object InstalledOn -Descending | Select-Object -First 1
$os = Get-CimInstance win32_operatingsystem -ComputerName $_
$disk = Get-WmiObject Win32_LogicalDisk -ComputerName $_ -Filter "DeviceID='C:'"
$props = [ordered]#{
ComputerName = $_
HotFixID = $update.HotFixID
InstalledOn = $update.InstalledOn
lastbootuptime = $os.LastBootUpTime
FreeSpace_GB = $disk.FreeSpace / 1GB
Error = "Success"
}
$Temp | Add-Member -NotePropertyMembers $props -TypeName temp
} Else {
$props = [ordered]#{
ComputerName = $_
Error = "Cannot be reached"
}
$Temp | Add-Member -NotePropertyMembers $props -TypeName temp
Write-Warning "$_ cannot be reached, skipping."
}
$Errors.Add($Temp) > $null
}
$Errors | Export-Csv C:\temp\computerDetails.csv -NoTypeInformation -Append