FileSystemWatcher works in the PowerShell ISE but not when run - powershell

Question

I want to monitor a folder and move files that match certain criteria, so I'm trying to use the FileSystemWatcher.
I have a function that will be called with each new file:
function ProcessFile()
{
param ([string]$filename)
Write-Host "Processing file '$filename' to $destination"
}
And then I set up a FSW:
Write-Host "Watching $source for new files..."
$fsw = New-Object IO.FileSystemWatcher $source, $filter -Property #{IncludeSubdirectories = $false; NotifyFilter = [IO.NotifyFilters]'FileName, LastWrite'}
Register-ObjectEvent $fsw Created -SourceIdentifier FileCreated -Action
{
ProcessFile $Event.SourceEventArgs.FullPath
}
That works fine when I run it from the ISE, and any files I drop into the watched folder are correctly tracked, but if I start a PowerShell window and run the script with .\FileWatch.ps1 then nothing happens.
I see the "watching ..." message, but never see a "processing..." message
Here's the full script that works in the ISE but not in a shell...
$source = 'D:\Dev\PowerShell\FileWatch\Test\Source'
$filter = '*.*'
$destination = 'D:\Dev\PowerShell\FileWatch\Test\Found\'
function ProcessFile()
{
param ([string]$filename)
Write-Host "Processing file '$filename' to $destination"
}
Write-Host "Watching $source for new files..."
$fsw = New-Object IO.FileSystemWatcher $source, $filter -Property #{IncludeSubdirectories = $false; NotifyFilter = [IO.NotifyFilters]'FileName, LastWrite'}
Register-ObjectEvent $fsw Created -SourceIdentifier FileCreated -Action {
ProcessFile $Event.SourceEventArgs.FullPath
}

Answer 1

The problem is that your function ProcessFile isn't loaded in powershell session.
Try loading you script in this way:
. .\myscript.ps1
In this way your code in my system works!
Read about Dot Sourcing a script in powershell.