Fancy InputBox for Mandatory Parameters

When you declare a parameter mandatory and the user does not specify it, PowerShell prompts the user for it. Another way of creating mandatory parameters is to provide a default value that triggers an action.

Here is an example:

#requires -Version 2
function Get-Something
{
  param
  (
    $Name = $(
      Add-Type -AssemblyName Microsoft.VisualBasic
      [Microsoft.VisualBasic.Interaction]::InputBox('Enter Name','Name', $env:username)
    )
  )

  "You entered $Name."
}

When you run Get-Something like this, the function runs unattended:

Get-Something -Name Test

When you forget to specify -Name, a dialog box pops up, and the user can enter the value.

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