ValidateSet Instead of Enum

by Jun 22, 2016

In the previous tip we illustrated how the new "enum" keyword works in PowerShell 5.0 to set the values that are assignable to a parameter. This has two backdraws: it works in PowerShell 5.0 only, and the enum needs to be declared before you can run the function.

If all you want is limiting choices, you can use a ValidateSet attribute instead. It is supported in older PowerShell versions and part of the function code:

#requires -Version 2
function Select-City
  "You chose $City"

ValidateSets provide smart IntelliSense in PowerShell ISE, just like enumerations do.

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