CODEWITHSUNDEEP
powershell
user2798062
user2798062

Reputation: 19

Powershell Bool returns Array

I'm tryng to return $true or $false from a function, and I get an array . If I remove the listBox messages it works as expected. Does anyone know why?

function TestEmptyFields()
{
  $empty= $false

  $listBox1.Items.Add("Testing fields")

  if ($txtPrtName.get_text()-eq "")
  {
    $listBox1.Items.Add("Empty name")
    $empty= $true
  }
  elseif ($txtPrtIP.get_text() -eq "")
  {
    $listBox1.Items.Add("Empty Ip")
    $empty= $true
  } 
  else 
  {
    $empty= $false
  }

  $listBox1.Items.Add($txtPrtName.get_text())
  $listBox1.Items.Add($txtPrtIP.get_text())

  return $empty
}

But it works fine like this:

function TestEmptyFields()
{
  if($txtPrtName.get_text()-eq "")
  {
    return $true
  }
  elseif ($txtPrtIP.get_text() -eq "")
  {
    return $true
  }
  else
  {
    return $false
  }
}

Upvotes: 2

Views: 1355

Answers (1)

Anthony Neace
Anthony Neace

Reputation: 26031

In powershell return $empty is functionally equivalent to $empty ; return -- that behavior was implemented to make things easier for people with a background in C-style languages, but you're actually returning more than you think! The listboxes return content as well. In fact, anything that isn't assigned to a variable or otherwise has its output nullified will reach the output stream. To fix this, try casting listbox to [void] like so: 

[void] $listBox1.Items.Add("Testing fields")

It probably wouldn't hurt to review this TechNet guide on proper usage of Listboxes in the context of a form, either.

Upvotes: 6

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