PowerShell can automatically bind values to parameters by data type matching. Here is a sample that shows what benefit this can be. Simply run this function:
function Test-Binding { [CmdletBinding(DefaultParameterSetName='Date')] param ( [Parameter(ParameterSetName='Integer', Position=0, Mandatory=$true)] [int] $Id, [Parameter(ParameterSetName='String', Position=0, Mandatory=$true)] [string] $Name, [Parameter(ParameterSetName='Date', Position=0, Mandatory=$true)] [datetime] $Date ) $chosenParameterSet = $PSCmdlet.ParameterSetName Switch ($chosenParameterSet) { 'Integer' { 'User has chosen Integer' } 'String' { 'User has chosen String' } 'Date' { 'User has chosen Date' } } [PSCustomObject]@{ Integer = $Id String = $Name Date = $Date } }
Now a user can call Test-Binding and submit arguments:
PS C:\> Test-Binding "Hello" User has chosen String Integer String Date ------- ------ ---- 0 Hello PS C:\> Test-Binding 12 User has chosen Integer Integer String Date ------- ------ ---- 12 PS C:\> Test-Binding (Get-Date) User has chosen Date Integer String Date ------- ------ ---- 0 11/21/2017 11:44:33 AM
