Powershell Write-Eventlog Linebreak - powershell

Question

I'm making a script which searches all Computer with specific Operating systems, run them through a Whitelist and, if there are Computer that are not on the Whitelist, I write an errorlog. The log looks like this right now:
#{Name=Computername1; Operatingsystem=Windows 10 Enterprise; DistinguishedName=CN=la,OU=computers,OU=lu,OU=Hosting,DC=a,DC=b,DC=ch; OperatingSystemVersion=10.0 (10586)}
But it should look like this:
Name=Computername1
Operatingsystem=Windows 10 Enterprise
DistinguishedName=CN=la,OU=computers,OU=lu,OU=Hosting,DC=a,DC=b,DC=ch
OperatingSystemVersion=10.0 (10586)
I want to delete the #{} and the 4 informations should be separated by line breaks.
My code:
$username = $env:UserName
$getad = Get-ADComputer -Filter {(operatingsystem -like "*Windows 10*" -and OperatingSystemVersion -notlike "*16299*" -and OperatingSystemVersion -notlike "*14393*" -and OperatingSystemVersion -notlike "*14279*" -and OperatingSystemVersion -notlike "*15063*" -and OperatingSystemVersion -notlike "*10159*" -and OperatingSystemVersion -notlike "*16193*" -and OperatingSystemVersion -notlike "*17025*" -and OperatingSystemVersion -notlike "*10074*" -and OperatingSystem -notlike "*LTSB") -or (operatingsystem -like "*Windows Vista*") -or (operatingsystem -like "*Windows XP*") -or (operatingsystem -like "*95*") -or (operatingsystem -like "*94*") -or ( operatingsystem -like "*Windows 8*" -and OperatingSystemVersion -notlike "*9600*" -and OperatingSystem -notlike "*LTSB") -or (operatingsystem -like "*2000 Professional*") -or (operatingsystem -like "*2000 Server*") -or (operatingsystem -like "*2003*") -or (operatingsystem -like "*Windows NT*") -or (operatingsystem -like "*Windows 7*" -and OperatingSystemVersion -notlike "*7601*" -and OperatingSystem -notlike "*LTSB")} -Properties ('Name', 'operatingsystem', 'DistinguishedName', 'OperatingsystemVersion') | ? {$_.distinguishedname -notlike "*OU=Oldwin10-Test,OU=a,OU=b,OU=c,OU=d,DC=e,DC=f,DC=ch"}
$whitelisted = Get-Content "C:\Users\$username\Desktop\whitelistedpcs.txt"
$getad | Select-Object Name, Operatingsystem, DistinguishedName,
OperatingSystemVersion | ForEach-Object {
if ($whitelisted -match $_.DistinguishedName) {
}
else{
Write-EventLog -LogName Application -Source "OldWinalert" -EntryType Error -EventId 1 -Message "$_"
}
}

Answer 1

You need to convert the output to string before sending it to the -Message parameter using Out-String will do:
for your case I would try this:
[...] -EntryType Error -EventId 1 -Message ($_ | Format-List | Out-String)
Another option:
else{
$Message = #"
Name: $($_.name)
Operating System: $($_.Operatingsystem)
Distinguished Name: $($_.DistinguishedName)
Operating System Version: $($_.OperatingSystemVersion)
"#
Write-EventLog -LogName Application -Source "OldWinalert" -EntryType Error -EventId 1 -Message $Message
}
and if you want extra line space add `n (for new line) on each line end after the brackets