access $args/params from inside method - powershell

Question

I am working on an error handling method for my PowerShell scripts. I pass it the error via try/catch on the catch, but I want to iterate through the original params from the command line that called it in order to create an error log and error email.
Here's what I have so far:
# --params--
param(
[string]$Directory,
[string]$ArchiveDirectory,
[string]$ErrorDirectory,
[string]$ErrorEmailFrom,
[string]$ErrorEmailTo,
[string]$ErrorEmailSubject,
[string]$ErrorSMTP,
[string]$FTPSite,
[string]$FTPUser,
[string]$FTPPass,
[string]$FTPRemoteDir
)
# list of arguments for debug
$paramList = $args
# --functions--
function Handle-MyError
{
Write-Host "handle-error"
Write-Host $args[0]; # this is the exception passed in
# -Email alert-
$subject = $ErrorEmailSubject + $FTPSite
# build message
$message = Get-Date -Format "yyyy-mm-dd hh:mm:ss"
$message += "`r`nError: " + $FTPSite + " : " + $args[0]
$message += "`r`nParameters:`r`n"
# Grab each parameter value, using Get-Variable
for ($i=0;$i -lt $paramList.Length; $i++)
{
$message += $paramList[$i]
}
# send email
$smtp = New-Object Net.Mail.SmtpClient($ErrorSMTP)
$smtp.Send($ErrorEmailFrom, $ErrorEmailTo, $subject, $message)
# drop error file
$theDate = Get-Date -Format "yyyymmdd"
$errorFile = $ErrorDirectory + "\" + $theDate + "_ERROR.txt"
Write-Host $errorFile
$message | Out-File $errorFile -Append
}
and in my try/catch:
catch [Exception]
{
Write-Host "SPOT 1"
Handle-MyError $_.
}
At the top, I try to save the original $args as $paramList to loop through later, but it's not working. Inside the Handle-MyError method, $args becomes the error that is passed so I thought if I save the original $argsas $paramList I could access it later, but it's wonky... Ideas?

Answer 1

There are several ways, in order of worst to best:
Use Get-Variable with Scope parameter. Scope number can differ, but it should be at least 2 (Script->Catch->Handle-MyError)
function Handle-MyError
{
Write-Host (Get-Variable -Name ErrorEmailFrom -ValueOnly -Scope 2)
}
Using $Script: prefix
function Handle-MyError
{
Write-Host $Script:ErrorEmailFrom
}
Using $PSBoundParameters
# list of arguments for debug
$paramList = $PsBoundParameters
function Handle-MyError
{
Param
(
$Exception,
$Cfg
)
Write-Host $Cfg.ErrorEmailFrom
}
catch [Exception]
{
Write-host "SPOT 1"
Handle-MyError -Exception $_ -Cfg $paramList
}
Using splatting:
$paramList = $PsBoundParameters
function Handle-MyError
{
Param
(
$Exception,
$ErrorDirectory,
$ErrorEmailFrom,
$ErrorEmailTo,
$ErrorEmailSubject,
$ErrorSMTP
)
Write-Host $ErrorEmailFrom
}
catch [Exception]
{
Write-host "SPOT 1"
Handle-MyError #paramList -Exception $_
}

Answer 2

Here's my final code after some help from #beatcracker.
I combined two pieces of the puzzle.
I need to save the initial params in a local var and Two, ($paramList = $PsBoundParameters)
Access this var/list using .GetEnumerator()
# --params--
param(
[string]$Directory,
[string]$ArchiveDirectory,
[string]$ErrorDirectory,
[string]$ErrorEmailFrom,
[string]$ErrorEmailTo,
[string]$ErrorEmailSubject,
[string]$ErrorSMTP,
[string]$FTPSite,
[string]$FTPUser,
[string]$FTPPass,
[string]$FTPRemoteDir
)
# set params as var for debug later
$paramList = $PsBoundParameters
# --functions--
function Handle-MyError
{
Write-Host "handle-error"
#write-host "Exception:" $args[0]; # this is the exception passed in
# -Email alert-
# build subject
$subject = $ErrorEmailSubject + " " + $FTPSite
# build message
$message = Get-Date -format s
$message += "`r`nError Message: " + $args[0]
$message += "`r`nParameters:`r`n"
$paramList.GetEnumerator() | ForEach-Object `
{
#Write-Host $_.Key "=" $_.Value
if ($_.Key -ne "FTPPass"){
$message += "`r`n" + $_
}
}
}