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How do I make a parameter required in PowerShell? I have tried to use Mandatory=$true but it's not worked for me and I got "Unexpected attribute parameter", can you guide me on how to set the parameter as mandatory in PowerShell?

param(
[string]$FirstName[Parameter(Mandatory=$true)],
[string]$Company[Parameter(Mandatory=$true)]
)

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Best answer

To make a mandatory parameter in PowerShell, you should add the "Mandatory=$true" before the parameter definition, not after the parameter name as you did!

Mandatory Parameter in PowerShell

param(
     [Parameter(Mandatory=$true)]    
     [string]$FirstName,
     [Parameter(Mandatory=$true)]
     [string]$Company)

Optional Parameter in PowerShell

param(
     [string]$FirstName,
     [string]$Company )

For more details, Please check Use PowerShell to Make Mandatory Parameters

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