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So I'm tweaking some Powershell libraries and I've a simple question that I'd like to solve in the best way.....

In short, I've some custom PSObjects in an array:

$m1 = New-Object PSObject –Property @{Option="1"; Title="m1"}
$m2 = New-Object PSObject –Property @{Option="2"; Title="m2"}
$m3 = New-Object PSObject –Property @{Option="3"; Title="m3"}

$ms = $m1,$m2,$m3

that I wish to convert into a string array.... ideally a single string array which has an entry for each item with the properties concatenated. i.e.

"1m1", "2m2", "3m3"

I've tried $topMenu | Select-Object Option,Title and $topMenu | %{ "O: $_.Option T: $_.Title "} but they give me arrays of the PSObject (again) or arrays of arrays.

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1 Answer

up vote 2 down vote accepted

This will give you what you want:

$strArray = $ms | Foreach {"$($_.Option)$($_.Title)"}

Select-Object is kind of like a SQL Select it projects the selected properties onto a new object (pscustomobject in v1/v2 and Selected. in V3). You second approach doesn't work because $_.Option in a string will only "interpolate" the variable $_. It won't evaluate the expression $_.Option. You can get double-quoted strings to evaluate expressions by using subexpressions e.g. "$(...)" or "$($_.Option)".

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KEITH! Wow I hoped you'd be watching the powershell tags... any chance of a 'why' ? I is it to invoke again??? – penderi Jan 15 at 16:20
Superb Keith. Thanks a lot. – penderi Jan 15 at 16:30

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