Powershell：找不到类型 [System.IO.Compression.ZipArchiveMode]：TypeNotFound 错误

Question

我看到 Windows Powershell 出现以下奇怪行为。

脚本1：

Add-Type -AssemblyName System.IO.Compression.FileSystem
[System.IO.Compression.ZipArchiveMode]::Update

输出：

 PS C:\Users\Administrator> C:\Users\Administrator\Documents\Untitled1.ps1
Unable to find type [System.IO.Compression.ZipArchiveMode].
At C:\Users\Administrator\Documents\Untitled1.ps1:3 char:1
+ [System.IO.Compression.ZipArchiveMode]::Update
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (System.IO.Compression.ZipArchiveMode:TypeName) [], RuntimeException
    + FullyQualifiedErrorId : TypeNotFound

脚本2：

Add-Type -AssemblyName System.IO.Compression.FileSystem
[IO.Compression.ZipFile]::Open
[System.IO.Compression.ZipArchiveMode]::Update 

输出：

 PS C:\Users\Administrator> C:\Users\Administrator\Documents\Untitled1.ps1

OverloadDefinitions                                                                                                                                        
-------------------                                                                                                                                        
static System.IO.Compression.ZipArchive Open(string archiveFileName, System.IO.Compression.ZipArchiveMode mode)                                            
static System.IO.Compression.ZipArchive Open(string archiveFileName, System.IO.Compression.ZipArchiveMode mode, System.Text.Encoding entryNameEncoding)    
                                                                                                                                                           
Update

为什么 Script1 无法加载 [System.IO.Compression.ZipArchiveMode]::Update？如何修复 Script1 以确保 [System.IO.Compression.ZipArchiveMode]::Update 正确加载？

Answer 1

您还需要加载System.IO.Compression 程序集，而不仅仅是System.IO.Compression.FileSystem：

# Note: Only necessary in *Windows PowerShell*.
# (These assemblies are automatically loaded on demand in PowerShell (Core) 7+.)
Add-Type -AssemblyName System.IO.Compression, System.IO.Compression.FileSystem

# Verify that types from both assemblies were loaded.
[System.IO.Compression.ZipArchiveMode]; [IO.Compression.ZipFile]