psboundparameters.ps1

$keys = $PSCmdlet.MyInvocation.BoundParameters.Keys

foreach ($key in $keys)
{
    $keyValue = @{
        $true = ",$key"
        $false = "?patchFields=$key"
    }
    $queryParams += $keyValue.($PSCmdlet.MyInvocation.BoundParameters.ContainsKey($key))
}