How to return specific data type from PowerShell function i.e. DataTable

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Rather than return use Write-Output -NoEnumerate. For example:

function New-DataTable {
   $datatable = New-Object System.Data.DataTable
   $null = $datatable.Columns.Add("x",[int])
   $null = $datatable.Columns.Add("y",[int])
   $null = $datatable.Rows.Add(@(1,2))
   $null = $dataTable.Rows.Add(@(3,4))
   Write-Output -NoEnumerate $datatable
}

New-DataTable | Get-Member

Note however that if you just type New-DataTable, it might look like enumberated rows, but Get-Member tells you the actual type returned.

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