CODEWITHSUNDEEP
powershell
ChrisAdkin
ChrisAdkin

Reputation: 1326

Invoking a function via Start-Job and switch parameters

I have the following code:

        Start-Job -ScriptBlock $Function:DbRefresh -argumentlist $DestSqlInstance   , `
                                                                 $RefreshDatabase   , `
                                                                 $PfaEndpoint       , `
                                                                 $PfaCredentials    , `
                                                                 $RefreshSource     , `
                                                                 $ForceDestDbOffline, `
                                                                 $NoPsRemoting      , `
                                                                 $PromptForSnapshot , `
                                                                 $ApplyDataMasks | Out-Null

The last four arguments are switches that are passed into the function this statement appears in, the position and type of the arguments that DbRefresh is called with are all correct. Despite this my job is aborting with:

A positional parameter cannot be found that accepts argument 'False'.
    + CategoryInfo          : InvalidArgument: (:) [], ParameterBindingException
    + FullyQualifiedErrorId : PositionalParameterNotFound

clearly there is some nuance to calling a function via Start-Job with switches that I've missed out. + PSComputerName : localhost

Upvotes: 1

Views: 242

Answers (1)

Repeat Daily
Repeat Daily

Reputation: 94

You'll need to adapt this to your scenario, but this implementation should do what you need.

[scriptblock]$sb = {
  function isOn {
    param (
      [switch]$on
    )
    if ($on) {write-output "on"} else { write-warning "off" }
  }
  isOn -On:$Args[0]
}

@($true,$false) | %{ start-job -ScriptBlock $sb -ArgumentList @($_) }

Get-Job |Receive-Job
  on
  WARNING: off

Upvotes: 2

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