[Solved] You want to create a script parameter that is required and ... Which of the following parameter declarations correctly enforces both requirements and will prompt the user if the parameter is missing? | PowerShell

PowerShell - Functions

You want to create a script parameter that is required and only accepts the values 'Start', 'Stop', or 'Restart'. Which of the following parameter declarations correctly enforces both requirements and will prompt the user if the parameter is missing?

A[CmdletBinding()] param( [Parameter(Mandatory=$true)] [ValidateSet('Start','Stop','Restart')] [string]$Action )

Bparam( [Parameter()] [ValidateSet('Start','Stop','Restart')] [string]$Action = 'Start' )

C[CmdletBinding()] param( [Parameter()] [ValidateSet('Start','Stop','Restart')] [string]$Action )

Dparam( [Parameter(Mandatory=$true)] [string]$Action )

Step-by-Step Solution

Solution:

Step 1: Ensure Mandatory prompts user
To prompt the user when a parameter is missing, the script must use CmdletBinding() and set Mandatory=$true.
Step 2: Restrict values with ValidateSet
Using ValidateSet limits input to the allowed values 'Start', 'Stop', or 'Restart'.
Step 3: Check all options
[CmdletBinding()] param( [Parameter(Mandatory=$true)] [ValidateSet('Start','Stop','Restart')] [string]$Action ) includes CmdletBinding(), Mandatory=$true, and ValidateSet, fulfilling all requirements.
Final Answer:
[CmdletBinding()] param( [Parameter(Mandatory=$true)] [ValidateSet('Start','Stop','Restart')] [string]$Action ) -> Option A
Quick Check:
CmdletBinding + Mandatory + ValidateSet = [CmdletBinding()] param( [Parameter(Mandatory=$true)] [ValidateSet('Start','Stop','Restart')] [string]$Action ) [OK]

Quick Trick: Use CmdletBinding with Mandatory and ValidateSet together [OK]

Common Mistakes:

Omitting CmdletBinding() so no prompt occurs
Setting default value disables Mandatory prompt
Not using ValidateSet to restrict values

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Which of the following parameter declarations correctly enforces both requirements and will prompt the user if the parameter is missing?

Step 1: Ensure Mandatory prompts user

Step 2: Restrict values with ValidateSet

Step 3: Check all options

Final Answer:

Quick Check:

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