Web Reference: Aug 23, 2011 · To make a parameter mandatory add a "Mandatory=$true" to the parameter description. To make a parameter optional just leave the "Mandatory" statement out. This code works for both script and function parameters: [Parameter(Mandatory=$true)] [String]$aMandatoryParameter, [String]$nonMandatoryParameter, [Parameter(Mandatory=$true)] The Parameter attribute has arguments that define the characteristics of the parameter, such as whether the parameter is mandatory or optional. Use the following syntax to declare the Parameter attribute, an argument, and an argument value. Jan 16, 2026 · In this guide, we’ll explore how to define mandatory parameters in PowerShell, from basic scenarios to advanced use cases like parameter sets and dynamic parameters.
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