PowerShell中将多个文件夹打包到单个压缩文件的问题

Hey there, let's work through this since you're new to PowerShell! I noticed your script cuts off mid-loop, so I'll fill in the gaps, fix potential pitfalls in your existing code, and explain everything step by step.

First, let's start with a complete, tested version of the script that does exactly what you want: backs up the App_Config, Resources, and bin directories from your dev82 site, saves them to C:\backup\DEV82 with a timestamp, and handles edge cases like missing directories.

Complete Working Script #

# Define key paths and target directories
$backupRoot = "C:\backup\DEV82"
$sourceSiteRoot = "C:\inetpub\wwwroot\dev82"
$directoriesToBackup = @("App_Config", "Resources", "bin")

# Create backup directory if it doesn't exist
if (-not (Test-Path -Path $backupRoot -PathType Container)) {
    New-Item -ItemType Directory -Path $backupRoot | Out-Null
    Write-Host "Created backup directory at $backupRoot"
}

# Get the actual directories we want to back up (skip any that don't exist)
$targetDirs = Get-ChildItem -Path $sourceSiteRoot -Directory | 
              Where-Object { $directoriesToBackup -contains $_.Name }

# Exit early if no target directories were found
if (-not $targetDirs) {
    Write-Warning "Warning: None of the target directories ($($directoriesToBackup -join ', ')) were found in $sourceSiteRoot"
    exit 1
}

# Generate a timestamp for unique backup filenames
$timeStamp = (Get-Date).ToString("yyyyMMdd_HHmmss")

# Load the .NET compression assembly (required for zip operations)
Add-Type -AssemblyName System.IO.Compression.FileSystem

# Option 1: Compress each directory into its own zip file
foreach ($dir in $targetDirs) {
    $zipFilePath = Join-Path -Path $backupRoot -ChildPath "$($dir.Name)_$timeStamp.zip"
    
    try {
        # Create zip from directory (Optimal compression, exclude top-level folder from zip)
        [System.IO.Compression.ZipFile]::CreateFromDirectory(
            $dir.FullName,
            $zipFilePath,
            [System.IO.Compression.CompressionLevel]::Optimal,
            $false
        )
        Write-Host "✅ Successfully compressed $($dir.Name) to $zipFilePath"
    }
    catch {
        Write-Error "❌ Failed to compress $($dir.Name): $_"
    }
}

# Option 2: Combine all three directories into a single zip file (uncomment to use)
# $combinedZipPath = Join-Path -Path $backupRoot -ChildPath "Dev82_FullBackup_$timeStamp.zip"
# try {
#     [System.IO.Compression.ZipFile]::CreateFromDirectory(
#         $sourceSiteRoot,
#         $combinedZipPath,
#         [System.IO.Compression.CompressionLevel]::Optimal,
#         $true,
#         $null,
#         $directoriesToBackup
#     )
#     Write-Host "✅ Successfully created combined backup at $combinedZipPath"
# }
# catch {
#     Write-Error "❌ Failed to create combined backup: $_"
# }

What Was Wrong With Your Original Script? #

Let's break down the issues in your initial code to help you avoid them in the future:

• Unreliable directory switching: Using cd in scripts is risky—if the path doesn't exist or you lack permissions, the script will fail silently. We use absolute paths instead for consistency.
• Imprecise directory filtering: Your Where-Object {$_.FullName -match "App_Config|Resources|bin"} could accidentally match directories with those strings in their full path (not just their name). Using -contains with a list of exact directory names is safer.
• Incomplete loop: Your script cut off at Foreach ($s—we filled in the compression logic using .NET's ZipFile class, which is the most reliable way to handle zips in PowerShell.
• No error handling: We added try/catch blocks to catch and report any issues during compression (like permission errors or locked files).
• No validation: We check if target directories exist before trying to compress them, so you get a clear warning instead of a silent failure.

How to Use This Script #

1. Copy the script into a .ps1 file (e.g., Backup-Dev82Directories.ps1)
2. Run it in PowerShell (make sure your execution policy allows script execution—run Set-ExecutionPolicy RemoteSigned if needed, then confirm)
3. Choose between Option 1 (individual zips) or Option 2 (single combined zip) by uncommenting the relevant section

内容的提问来源于stack exchange，提问作者Vasyl Stepulo