比较2个文件夹，然后将差异复制到另一个文件夹中-我的代码缺少某些内容

如何解决比较2个文件夹，然后将差异复制到另一个文件夹中-我的代码缺少某些内容

在这里，我试图比较2个文件夹，然后递归地将差异复制到第三个文件夹中。

下面是我的代码，我能够完成大部分工作，但无法像在Folder1中那样将文件复制到精确的文件夹结构中。该脚本实际上将文件直接复制到folder3上，而没有任何文件夹。这只是从不同的文件夹中单独复制文件，然后将其放入文件夹3。任何帮助将不胜感激。

$Folder1path = "M:\Technical\foldercompare\folder1"
$Folder2path = "M:\Technical\foldercompare\folder2"
$Folder3path = "M:\Technical\foldercompare\folder3"
$Folder1 = Get-childitem -path $Folder1path -Recurse
$Folder2 = Get-childitem -path $Folder2path -Recurse
Compare-Object -ReferenceObject $folder1 -DifferenceObject $Folder2
Compare-Object $Folder1 $Folder2 -Property Name,Length  | 
Where-Object {$_.SideIndicator -eq "<="} | 
ForEach-Object {
            Copy-Item "$Folder1path\$($_.name)" -Destination "$Folder3path" -Force -Recurse
}

解决方法

下面的脚本代表了您执行任务的一种方式（假设您的3个目录共享一个公共的父目录）。顺便说一句，您最初的尝试未能处理$null或$Folder1Path为空时发生的$Folder2Path。

# Files in 1 but not in 2 should wind up in 3 with the same dir structure as occurs in 1
param(
    $Folder1path = "$PSScriptRoot\folder1",$Folder2path = "$PSScriptRoot\folder2",$Folder3path = "$PSScriptRoot\folder3"
)

$ErrorActionPreference = "Stop";
Set-StrictMode -Version 'Latest'

Get-ChildItem -Path $Folder1Path -Recurse | Where-Object {

    [string] $toDiff = $_.FullName.Replace($Folder1path,$Folder2path)
    # Determine what's in 2,but not 1
    [bool] $isDiff = (Test-Path -Path $toDiff) -eq $false
    
    if ($isDiff) {
        # Create destination path that contains folder structure
        $dest = $_.FullName.Replace($Folder1path,$Folder3path)
        Copy-Item -Path $_.FullName -Destination $dest -Verbose -Force
    }
}