ValidateNotNullOrEmpty extends ValidateNotNull to disallow empty arrays and empty strings:

function Test-ValidateNotNullOrEmpty {
 [CmdletBinding()]
 param (
 [ValidateNotNullOrEmpty()]
 [String]$Parameter1,

 [ValidateNotNullOrEmpty()]
 [Object[]]$Parameter2
 )
}

An error will be thrown if either an empty string is supplied for Parameter1, or an empty array is supplied for Parameter2. Like ValidateNotNull, ValidateNotNullOrEmpty has no effect on numeric types.