如何在Powershell中有效地将行预先挂起到大文件中

$filePath = "path/to/largefile.txt"
$outputPath = "path/to/outputfile.txt"
$searchString = "string/pattern/to/search"
$maxChunkSize = 1000000

$fileStream = [System.IO.File]::OpenRead($filePath)
$streamReader = New-Object System.IO.StreamReader($fileStream)

$chunk = 0
$chunkLines = @()
$lineNumber = 0

while (!$streamReader.EndOfStream) {
    $line = $streamReader.ReadLine()
    $lineNumber++

    if ($line -match $searchString) {
        $chunkLines += $lineNumber
    }

    if ($lineNumber % $maxChunkSize -eq 0) {
        Write-Host "Processing chunk $chunk..."
        $chunk++

        $chunkLines | Add-Content -Path $outputPath
        $chunkLines = @()
    }
}

$chunkLines | Add-Content -Path $outputPath
$streamReader.Close()
$fileStream.Close()