Write-Progress from WebClient

DownloadFile.ps1

function Invoke-FileDownload
{
    [CmdletBinding()]
    param (
        [Parameter(Mandatory)]
        [uri] $Uri,

        [Parameter(Mandatory)]
        [string] $OutputFile
    )

    $webClient = New-Object System.Net.WebClient

    $changed = Register-ObjectEvent -InputObject $webClient -EventName DownloadProgressChanged -Action {
        Write-Progress -Activity "Downloading $Uri to $OutputFile" -PercentComplete $eventArgs.ProgressPercentage
    }

    $handle = $webClient.DownloadFileAsync($Uri, $PSCmdlet.GetUnresolvedProviderPathFromPSPath($OutputFile))

    while ($webClient.IsBusy)
    {
        Start-Sleep -Milliseconds 10
    }

    Write-Progress -Activity "Downloading $Uri to $OutputFile" -Completed
    Remove-Job $changed -Force
    Get-EventSubscriber | Where SourceObject -eq $webClient | Unregister-Event -Force
}