I needed to download file using WebClient in PowerShell 2.0, and I wanted to show download progress, so I did it this way:

$activity = "Downloading"

$client = New-Object System.Net.WebClient
$urlAsUri = New-Object System.Uri($url)

$event = New-Object System.Threading.ManualResetEvent($false)

$downloadProgress = [System.Net.DownloadProgressChangedEventHandler] {
    $progress = [int]((100.0 * $_.BytesReceived) / $_.TotalBytesToReceive)
    Write-Progress -Activity $activity -Status "${progress}% done" -PercentComplete $progress
}

$downloadComplete = [System.ComponentModel.AsyncCompletedEventHandler] {
    Write-Progress -Activity $activity -Completed
    $event.Set()
}

$client.add_DownloadFileCompleted($downloadComplete) 
$client.add_DownloadProgressChanged($downloadProgress)

Write-Progress -Activity $activity -Status "0% done" -PercentComplete 0
$client.DownloadFileAsync($urlAsUri, $file)    

$event.WaitOne()

I am getting a error There is no Runspace available to run scripts in this thread. for the code in $downloadProgress handler, which is logical. However, how do I provide a Runspace for the thread that (probably) belongs to the ThreadPool?

UPDATE: Note that both answers to this question are worth reading, and I would accept both if I could.

multithreading powershell
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