Custom error from parameters in PowerShell

Question

Is it possible to have ValidateScript generate a custom error message when a test fails, like say Test-Path?

Instead of this:

Answer 1

I am not sure.

A suggestion: maybe you want to just trap the error, and make your own message.

trap [Error.Type] { 
  @"
  The message you want displayed.
  With maybe some additional information.
  I.e.: The full message itself: {0}' -f  $_.Error.Message;
  continue;
}