If you'd like to apply a numeric range of legal values to a variable, you can add a ValidateRange attribute to the variable, pretty much like function parameters work. Except, with variables you need to do it manually:
$test = 1 $variable = Get-Variable test $validateRange = New-Object -TypeName System.Management.Automation.ValidateRangeAttribute(1,100) $variable.Attributes.Add($validateRange) $test = 10 $test = 100 $test = 1000
The variable $test now accepts numeric values in the range from 1 to 100. When you try and assign a value outside the range, you get an exception.
PS C:\> $test = 101 The variable cannot be validated because the value 101 is not a valid value for the test variable. At line:1 char:1 + $test = 101 + ~~~~~~~~~~~ + CategoryInfo : MetadataError: (:) [], ValidationMetadataException + FullyQualifiedErrorId : ValidateSetFailure
