Using a dynamicparam block in an advanced function causes invocations with the -PipelineVariable common parameter to fail #6420

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1. MaximoTrinidad commented on Mar 19, 2018

   

   Maximo Trinidad (MaximoTrinidad)

   on Mar 19, 2018

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   Just an FYI

   All example I'm found on the internet involves more code in the DynamicParam scriptblock area.

   I can't find no simple sample like the one Michael Klement (@mklement0) has provided.

   There's always some complex coding in it:
   https://stackoverflow.com/questions/42318419/powershell-using-dynamic-parameters-value
   http://www.powershellmagazine.com/2014/05/29/dynamic-parameters-in-powershell/

   The simplest code I found: https://community.spiceworks.com/topic/1694525-powershell-dynamic-parameters

   I wonder if it's an overkill. Of course, I haven't use it.
   :)
2. mklement0 commented on Mar 19, 2018

   

   Michael Klement (mklement0)

   on Mar 19, 2018

   ContributorAuthor

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   Maximo Trinidad (@MaximoTrinidad):

   Here's a relatively simple working example that defines a dynamic -baz parameter that uses a validate-set attribute to only accept value 1, 2, or 3.
   As you'll see, the problem with -PipelineVariable persists; try foo -pv var.

   function foo {
       [CmdletBinding()] # !! Required for DynamicParam {} to work properly.
       param([string] $bar)
       DynamicParam
       {
           # Create the dynamic parameter's attributes.
           # -- Create a [Parameter()] attribute.
           $paramAttr = [System.Management.Automation.ParameterAttribute]::new()
           # Set properties such as .ParameterSetName, .Position, .ValueFromPipeline, ...
           $paramAttr.Position = 1
           # -- Create a [ValidateSet()] attribute with a set of permissive values.
           $validateSetAttr = [System.Management.Automation.ValidateSetAttribute]::new(1, 2, 3)
   
           # Create the dynamic parameter with its name, type, and attributes...
           $dynParam1 = [System.Management.Automation.RuntimeDefinedParameter]::new('baz', [int],
               ($paramAttr, $validateSetAttr)
           )
   
           # ... and add it to a RuntimeDefinedParameterDictionary to return.
           $paramDict = [System.Management.Automation.RuntimeDefinedParameterDictionary]::new()
           $paramDict.Add($dynParam1.Name, $dynParam1)
           return $paramDict
       }
       end {
           $bar
           $baz
       }
   }
3. MaximoTrinidad commented on Mar 19, 2018

   

   Maximo Trinidad (MaximoTrinidad)

   on Mar 19, 2018

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   Thanks Michael Klement (@mklement0)!
   :)

   👍React with 👍1Reacted by Michael Klement
4. Dongbo Wang (daxian-dbw)

   closed this as completedin #6433on Mar 20, 2018
5. Ilya (iSazonov)

   added

   Resolution-FixedThe issue is fixed.The issue is fixed.

   on Mar 24, 2018