Powershell defaultparameterset not working. error

Question

I am trying to use parameter set and use default parameter set. But the default parameter set doesn't seem to work for me. Any help is much appreciated. I can easily use validate set with default action but I want to know what I am doing wrong here.

Param([cmdletbinding(DefaultParametersetname="Directory")] 
      [Parameter(Mandatory=$false,ParameterSetName="File")]
      [switch]$file, 
      [Parameter(Mandatory=$false,ParameterSetName="Directory")]  
      [switch]$directory,

[Parameter(Mandatory=$false,ParameterSetName="File")] 
[Parameter(Mandatory=$false,ParameterSetName="Directory")] 
[string]$Source,
[Parameter(Mandatory=$true,ParameterSetName="File")]  
[Parameter(Mandatory=$true,ParameterSetName="Directory")] 
[string]$DestinationPath, 
[Parameter(Mandatory=$false,ParameterSetName="Directory")] 
[Parameter(Mandatory=$false,ParameterSetName="File")]
[array]$Servers

PS C:\> Test-Script -Source "c:\somedirectory" -DestinationPath "c:\someotherdirectory"

error as shown below in the image

Test-Script : Parameter set cannot be resolved using the specified named parameters.
At line:1 char:1
+ Test-Script -Source "c:\somedirectory" -DestinationPath "c:\someotherdirectory"
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [Test-Script], ParameterBindingException
+ FullyQualifiedErrorId : AmbiguousParameterSet,Test-Script

Mathias R. Jessen · Accepted Answer · 2016-07-14 21:52:35Z

8

The CmdletBinding() attribute needs to go outside the param block, immediately before the param keyword, otherwise it will simply be ignored:

[CmdletBinding(DefaultParametersetname="Directory")]
Param(
    [Parameter(Mandatory=$false,ParameterSetName="File")]
    [switch]$file, 

    [Parameter(Mandatory=$false,ParameterSetName="Directory")]
    [switch]$directory,

    [Parameter(Mandatory=$false,ParameterSetName="File")]
    [Parameter(Mandatory=$false,ParameterSetName="Directory")]
    [string]$Source,

    [Parameter(Mandatory=$true,ParameterSetName="File")]
    [Parameter(Mandatory=$true,ParameterSetName="Directory")]
    [string]$DestinationPath,

    [Parameter(Mandatory=$false,ParameterSetName="Directory")]
    [Parameter(Mandatory=$false,ParameterSetName="File")] 
    [array]$Servers
)

edited Jul 14, 2016 at 21:52

answered Jul 14, 2016 at 21:47

Mathias R. Jessen

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3 Comments

tarunmunjal Over a year ago

Thanks Mathias!! that seems to have resolved the issue.

briantist Over a year ago

Good catch! In my mind I was already parsing the various sets haha

Mathias R. Jessen Over a year ago

@briantist something in my mind started twitching when I saw param([cmdl... ;)

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