New-SpSite cmdlet with parameters list

Question

Hi everyone !
In a PS script on a Sharepoint server, I'm trying to call a cmdlet with some arguments.
This is OK :
New-SpSite -url $url -owneralias $owneralias
However, I have the requirement to create a parameter list with arguments that sometimes are present, sometimes not. So I thought it was possible to create a string like this $Paramlist = "-url "+$url+" -owneralias "+$owneralias ... But It's not ok, PS give
me various errors.
What is the best method to construct a parameters list ?
TY for your assistance. Have a nice day.
J.

Answer 1

You can certainly create your parameter list - you will want to create a literal string of your parameters and then execute the command with the Invoke-Expression cmdlet. Literal strings are constructed with the single quote character. Take a look at this
article regarding how PowerShell processes strings -
http://www.computerperformance.co.uk/powershell/powershell_quotes.htm. If you don't use literal strings, then PowerShell will take your variables and produce the output in your $Paramlist variable which is not what you want when constructing the command,
especially if the variables contain any objects.
Example using a literal string and Invoke-Expression:
#... code to create variables (i.e. your $url and $owneralias variables)
$expression = 'New-SPSite -url $url -owneralias $owneralias'
$mySPSite = Invoke-Expression $expression
So simply construct a literal string, then execute it with Invoke-Expression. Give that a shot and let me know how you make out. I use this technique all the time when creating functions.
I hope this helps,
Craig
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