Splatting Arguments directly (w/o saving them in a temp variable) - powershell

Question

I got a hashtable with connection-data for various (S)FTP-Connections. Thanks to the Module "WinSCP" I can easily create sessions for (S)FTP-Transfers
Currently I'm saving the Hastable-result in a temporary variable $arguments and use this variable for the splatting afterwards
Even if it's just one line of code that could be spared: is there a way to avoid the variable $arguments?
Sample-Hashtable:
$preferences = #{
"FTPUser" = #{
HostName = "ftp.domain.com"
PortNumber = 21
Protocol = "FTP"
}
"SFTPUser" = #{
HostName = "sftp.otherdomain.com"
GiveUpSecurityAndAcceptAnySshHostKey = $true
}
}
Function Get-FtpSession with the current temp-variable:
function Get-FtpSession ($user) {
$arguments = $preferences["$user"]
$session = New-WinSCPSession #arguments
return $session
}
I thought that I can use something like this (which does not work):
$session = New-WinSCPSession #($preferences["$user"])
P.S: I know that this question is kind of pointless but I was still wondering if it could be solved

Answer 1

If you are willing to modify that cmdlet, you can achieve something similar by adding ValueFromPipelineByPropertyName switch to it's parameters. Thus you can feed parameters from pipe.
function foo { [CmdletBinding()]param(
[parameter(ValueFromPipelineByPropertyName=$true)][String]$arg1,
[parameter(ValueFromPipelineByPropertyName=$true)][String]$arg2
)
Write-Host ($arg1 + " " + $arg2 + "!")
}
[pscustomobject]#{arg1="hello"; arg2="there"} | foo