how to export powershel result to csv - powershell

Question

I want to export what I already filtered in ForEach-Object. The problem is that I can't export the filtered data.
I tried the following:
$getTapes.rows | Export-Csv C:\\123\\123456.txt but this has exported all the information without filter.
$getTapes = Invoke-RestMethod -Method GET -ContentType $content -Uri $Uri -Headers #{'Authorization' = $Authorization}
$today = Get-Date
$getTapes.rows | ForEach-Object {
$tape = $_;
if ( $tape.custom_fields.Ueberschreibschutz.value -ge $today ) {
Write-Host "Treffer ID=" $tape.asset_tag " Name=" $tape.name " SNR=" $tape.serial " Mediensatz=" $tape.custom_fields.Mediensatz.value
}
}
$getTapes.rows |export-Csv C:\\123\\123456.txt
I expect:
Treffer ID= 1 Name= 12 SNR= 12345 Mediensatz= M
Treffer ID= 2 Name= 32 SNR= 54321 Mediensatz= W

Answer 1

You should not use Write-Host to collect data. That's only to output pixels on the screen. Instead you should create a custom object you can use as you want later on ... like this:
$Result = $getTapes.rows | ForEach-Object {
if ( $_.custom_fields.Ueberschreibschutz.value -ge $today ) {
[PSCustomObject]#{
TrefferID = $_.asset_tag
Name = $_.name
SNR = $_.serial
Mediensatz = $_.custom_fields.Mediensatz.value
}
}
}
$Result | Export-Csv -Path C:\123\123456.csv -NoTypeInformation

Answer 2

Write-host do nothing except it shows you the result in the console, so it will not modify or delete the things you don't want in $getTapes.rows.
Instead you can define a variable $result and iterate over the $getTapes.rows using Foreach-Object, and add the result if it meets your if condition.
Try this:
$getTapes = Invoke-RestMethod -Method GET -ContentType $content -Uri $Uri -Headers #{'Authorization' = $Authorization}
$today = Get-Date
$getTapes.rows | ForEach-Object -begin {$result = "" } {
$tape = $_;
if ( $tape.custom_fields.Ueberschreibschutz.value -ge $today ) {
$result += "Treffer ID= $($tape.asset_tag) Name= $($tape.name) SNR= $($tape.serial) Mediensatz= $($tape.custom_fields.Mediensatz.value)`n"
}
} -end {$result | export-Csv C:\123\123456.txt}