如何提高 3 个连续 GCI -Recurse 调用的性能？

Question

Powershell noob here. In order to create a list of potential duplicate dirs, I have a loop that runs the following 3 GCI commands on all directories to get the total size, number of files and number of directories below the currently examins dir:

$folderSize = Get-Childitem -Path $fullPath -Recurse -Force -ErrorAction SilentlyContinue | Measure-Object -Property Length -Sum -ErrorAction SilentlyContinue       
$folderDirs = Get-ChildItem -Path $fullPath -Recurse -Force -ErrorAction SilentlyContinue -Directory | Measure-Object -ErrorAction SilentlyContinue       
$folderFiles = Get-ChildItem -Path $fullPath -Recurse -Force -ErrorAction SilentlyContinue -File | Measure-Object -ErrorAction SilentlyContinue       

The code is working fine but it seems really dumb to run 3 times a GCI with the recurse parameter on the same path. What would be a more efficient way to get those 3 informations for a given directory?

Answer 1

Store the results of the where first query in a variable, use the .Where({}) extension method to split them into categories based on the PSIsContainer property - at which point you can reference the automagical Count property of each (rather than invoking Measure-Object for the simple act of counting the items):

$allFileSystemItems = Get-Childitem -Path $fullPath -Recurse -Force -ErrorAction SilentlyContinue
$size = $allFileSystemItems |Measure-Object Length -Sum

# split collections into "directories" and "files"
$dirs,$files = $allFileSystemItems.Where({$_.PsIscontainer}, 'Split')

$dirCount = $dirs.Count
$fileCount = $files.Count