Defining parameter sets

A parameter set in PowerShell groups different parameters together. In some cases, this is used to change the output of a command; in others, it provides a different way of supplying a piece of information.

For example, the output from the Get-Process command changes if the Module parameter or, to a lesser extent, the IncludeUserName parameter is supplied.

The Get-ChildItem command also has two parameter sets: one that accepts a Path with wildcard support and another that accepts a LiteralPath that does not support wildcards.

Parameter sets are declared using the ParameterSetName property of the Parameter attribute.

The following example has two parameter sets; each parameter set contains a single parameter:

function Get-InputObject {
    [CmdletBinding()]
    param (
        [Parameter(ParameterSetName = 'FirstSetName')]
        $Parameter1,
        [Parameter(ParameterSetName = 'SecondSetName')]
        $Parameter2...