Number of table count is wrong in dataset - powershell

Question

I am supplying 3 servers to loop however the $mdtable.table.count is only 1. I must be missing a simple thing here. Can anyone please help me resolve this?
Get-Content 'C:\test\computers.txt' | ? { $_.Trim() -ne "" } | ForEach-Object {
$value = Invoke-Command -Computer $_ -ScriptBlock {
Param($computer)
# Connect to SQL and query data, extract data to SQL Adapter
$SqlQuery = "xp_fixeddrives"
$SqlConnection = New-Object System.Data.SqlClient.SqlConnection
$SqlConnection.ConnectionString = "Data Source=$computer;Initial Catalog='Secaudit';Integrated Security = True";
$SqlAdapter = New-Object System.Data.SqlClient.SqlDataAdapter($SqlQuery, $Sqlconnection)
$mdtable = New-Object System.Data.Dataset
$nRecs = $SqlAdapter.Fill($mdtable) | Out-Null
$nRecs | Out-Null
$res = $mdtable.Tables.Count
$res
} -ArgumentList $_ -Credential $cred
}
$value

Answer 1

The thing you're missing is that
... | ForEach-object {
$value = Invoke-Command -Computer $_ -ScriptBlock {
...
} -ArgumentList $_ -Credential $cred
}
replaces the value of $value with each iteration when you actually want to accumulate the values.
You can achieve this for instance like this:
... | ForEach-object {
$value += Invoke-Command -Computer $_ -ScriptBlock {
...
} -ArgumentList $_ -Credential $cred
}
or like this:
$value = ... | ForEach-object {
Invoke-Command -Computer $_ -ScriptBlock {
...
} -ArgumentList $_ -Credential $cred
} | Measure-Object -Sum | Select-Object -Expand Sum