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    <p>You could group those parameters by defining a parameter set to accomplish this.</p> <pre class="lang-powershell prettyprint-override"><code>param ( [Parameter(ParameterSetName='One')][switch]$CreateNewChild, [Parameter(ParameterSetName='One',Mandatory=$true)][string]$PropertyType ) </code></pre> <p>Reference: </p> <p><a href="http://blogs.msdn.com/b/powershell/archive/2008/12/23/powershell-v2-parametersets.aspx" rel="noreferrer">http://blogs.msdn.com/b/powershell/archive/2008/12/23/powershell-v2-parametersets.aspx</a></p> <p><a href="http://blogs.technet.com/b/heyscriptingguy/archive/2011/06/30/use-parameter-sets-to-simplify-powershell-commands.aspx" rel="noreferrer">http://blogs.technet.com/b/heyscriptingguy/archive/2011/06/30/use-parameter-sets-to-simplify-powershell-commands.aspx</a></p> <p>--- Update ---</p> <p>Here's a snippet that mimics the functionality you're looking for. The "Extra" parameter set will not be processed unless the -Favorite switch is called.</p> <pre class="lang-powershell prettyprint-override"><code>[CmdletBinding(DefaultParametersetName='None')] param( [Parameter(Position=0,Mandatory=$true)] [string]$Age, [Parameter(Position=1,Mandatory=$true)] [string]$Sex, [Parameter(Position=2,Mandatory=$true)] [string]$Location, [Parameter(ParameterSetName='Extra',Mandatory=$false)][switch]$Favorite, [Parameter(ParameterSetName='Extra',Mandatory=$true)][string]$FavoriteCar ) $ParamSetName = $PsCmdLet.ParameterSetName Write-Output "Age: $age" Write-Output "Sex: $sex" Write-Output "Location: $Location" Write-Output "Favorite: $Favorite" Write-Output "Favorite Car: $FavoriteCar" Write-Output "ParamSetName: $ParamSetName" </code></pre>
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    1. COI've tried this, here is the code: `param( [Parameter(Position=0,Mandatory=$true)] [string]$KeyPath, [Parameter(Position=1,Mandatory=$true)] [string]$Name, [Parameter(Position=2,Mandatory=$true)] [string]$NewValue, [Parameter(ParameterSetName="One")][switch]$CreateNewChild, [Parameter(ParameterSetName="One",Mandatory=$true)] [string]$PropertyType ) `However, this doesn't work. When trying to execute the following: `Set-RegistryKeyPropertyValue -KeyPath $path -Name $name -NewValue 0` It asks me to supply the value for $PropertyType, as it's mandatory
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    2. COSorry, I should have been more specific. I have added a better example to the answer above. :)
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    3. COYes, this is exactly what I was looking for! Thank you! p.s. The one option that I haven't tried to make "$Favorite" mandatory=$false, I thought it was false by default. This parameter set logic is weird...
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