PowerShell使用大量内存解压缩GZip管道

我正在编写一个powershell Cmdlet,以接受对gzipped文件的文件引用列表,并解压缩它们并将它们的文本行放到管道上。我有一些功能,但它正在使用大量的内存。有趣的是,完成后,如果我在powershell提示符下运行[System.GC]::Collect(),它将释放内存。我尝试在循环中运行它,但它影响了性能。有人能指出我做错了什么吗。我认为使用管道的好处之一是节省内存。即使我传递给它一个文件引用,它也会比文件的大小占用更多的内存。

这是我的密码。

<#
.SYNOPSIS
Accepts GZip files piped in and outputs decrompessed text to the pipe.

.DESCRIPTION
You can use this function to pipe a list of serveral gzipped files.  They will then be decompress and concatenated
and the text will be written to the output where it can be piped to another function.

.PARAMETER PipedFile
A list of gzipped file references.

.EXAMPLE
Get-ChildItem "*.gz" | Decompress-Gzip

#>
Function Decompress-GZip {
    Param(
      [Parameter(ValueFromPipeline=$true)]
      [System.IO.FileInfo]$PipedFile

    )

    Process {

        If ( $PipedFile.Exists -eq $False) {
          Write-Host "File $PipedFile does not exist. Skipping."
          return
        }

        $BUFFER_SIZE = 65536

        $infile = $PipedFile.FullName


        $inputfile = New-Object System.IO.FileStream $inFile, ([IO.FileMode]::Open), ([IO.FileAccess]::Read), ([IO.FileShare]::Read)
        $gzipStream = New-Object System.IO.Compression.GzipStream $inputfile, ([IO.Compression.CompressionMode]::Decompress)
        try {
            $buffer = New-Object byte[]($BUFFER_SIZE)

            While (($read = $gzipstream.Read($buffer, 0, $BUFFER_SIZE)) -gt 0) {
                $str = [System.Text.Encoding]::ASCII.GetString($buffer,0,$read)
                $temp = $str -split "`r`n"
                if ($temp.Length -gt 0) {
                    if ($lastLine) {
                        $temp[0] = $lastLine + $temp[0]
                    }
                    if ($temp.Length -gt 1) {
                        Write-Output $temp[0..($temp.Length-2)]
                    }
                    $lastLine = $temp[($temp.Length-1)]
                }
            }
        } finally {
         $gzipStream.Close()
         $inputfile.Close()
        }

    }

}