Powershell - Conditionally add parameter/argument to cmdlet

Question

Suppose I have a Powershell script similar to this:

$par = [...]
New-Connection `
  -Server $par.Server `
  -User $par.User `
  -Pwd $par.Pwd `
  - [...]

If $par.Pwd is empty or null, New-Connection will throw an error.

So, I only want to include this parameter, if $par.Pwd has a value. Since there are a lot(!) of parameters, which might be empty, I don't want to write the command in 1000 different variations. I thought of sth like.

New-Connection `
  -Server $par.Server `
  -User $par.User `
  $(if ($par.Pwd) {-Pwd $par.Pwd})

but this doesn't work.

Answer 1

How about using the hashtable approach to creating new objects:

$Object = New-Object PSObject -Property @{            
    Name             = $obj.Name 
    OptValue1        = $obj.OptValue1
    OptValue2        = $obj.OptValue2   
    OptValue3        = $null
    OptValue4        = "MyValue"
}  
$Object      

Update Splatting may also help, see here for more details, but if all your parameter names match you might be able to call New-Connection then pass it a hashtable containing your values.

New-Connection @par