PowerShell - How do I pass string parameters correctly?

Is there documentation or an article on the rules for passing strings into PowerShell functions? I just trying to do some string concatenation/formatting, but it's putting all the parameters into the first placeholder.

Code

function CreateAppPoolScript([string]$AppPoolName, [string]$AppPoolUser, [string]$AppPoolPass)
{
    # Command to create an IIS application pool
    $AppPoolScript = "cscript adsutil.vbs CREATE ""w3svc/AppPools/$AppPoolName"" IIsApplicationPool`n"
    $AppPoolScript += "cscript adsutil.vbs SET ""w3svc/AppPools/$AppPoolName/WamUserName"" ""$AppPoolUser""`n"
    $AppPoolScript += "cscript adsutil.vbs SET ""w3svc/AppPools/$AppPoolName/WamUserPass"" ""$AppPoolPass""`n"
    $AppPoolScript += "cscript adsutil.vbs SET ""w3svc/AppPools/$AppPoolName/AppPoolIdentityType"" 3"

    return $AppPoolScript
}
$s = CreateAppPoolScript("name", "user", "pass")
write-host $s

Output

cscript adsutil.vbs CREATE "w3svc/AppPools/name user pass" IIsApplicationPool
cscript adsutil.vbs SET "w3svc/AppPools/name user pass/WamUserName" ""
cscript adsutil.vbs SET "w3svc/AppPools/name user pass/WamUserPass" ""
cscript adsutil.vbs SET "w3svc/AppPools/name user pass/AppPoolIdentityType" 3

From stackoverflow BrianLy

• Lose the parentheses and commas.

  Calling your function as:

  $s = CreateAppPoolScript "name" "user" "pass"
  

  gives:

  cscript adsutil.vbs CREATE "w3svc/AppPools/name" IIsApplicationPool
  cscript adsutil.vbs SET "w3svc/AppPools/name/WamUserName" "user"
  cscript adsutil.vbs SET "w3svc/AppPools/name/WamUserPass" "pass"
  cscript adsutil.vbs SET "w3svc/AppPools/name/AppPoolIdentityType" 3
  

  Justice : This is, coincidentally, how a fair number of programming languages work (O'Caml, Haskell).
  From Paul Roub

• Paul's right.
  In PowerShell, function parameters are not enclosed in parenthesis. (Method parameters still are.)
  Your initial call was just passing one big array to the function, rather than the three separate parameters you wanted.

  From Steven Murawski

• By the way, using a PowerShell here-string might make your function a little easier to read as well, since you won't need to double up all the "-marks:

  function CreateAppPoolScript([string]$AppPoolName, [string]$AppPoolUser, [string]$AppPoolPass)
  {
    # Command to create an IIS application pool
    return @"
  cscript adsutil.vbs CREATE "w3svc/AppPools/$AppPoolName" IIsApplicationPool
  cscript adsutil.vbs SET "w3svc/AppPools/$AppPoolName/WamUserName" "$AppPoolUser"
  cscript adsutil.vbs SET "w3svc/AppPools/$AppPoolName/WamUserPass" "$AppPoolPass"
  cscript adsutil.vbs SET "w3svc/AppPools/$AppPoolName/AppPoolIdentityType" 3
  "@
  }
  

  From Emperor XLII

• Nice .. thanks

  John Weldon : good feedback; use comments rather than answers :)
  From $pageUsers[$post.author].name