无法找到类型[System.IO.Compression.CompressionLevel],请确保已加载包含此类型的程序集

Question

我编写了这个PowerShell脚本,该脚本应该在特定日期范围内存档所有日志文件.

$currentDate = Get-Date;
$currentDate | Get-Member -Membertype Method Add;
$daysBefore = -1;
$archiveTillDate = $currentDate.AddDays($daysBefore);

$sourcePath = 'C:\LOGS';
$destPath='C:\LogArchieve\_'+$archiveTillDate.Day+$archiveTillDate.Month+$archiveTillDate.Year+'.zip';

foreach( $item in (Get-ChildItem $sourcePath | Where-Object { $_.CreationTime -le $archiveTillDate }) )
{
    [Reflection.Assembly]::LoadWithPartialName("System.IO.Compression.FileSystem");
    $compressionLevel = [System.IO.Compression.CompressionLevel]::Optimal;
    [System.IO.Compression.ZipFile]::CreateFromDirectory($sourcePath,$destPath, $compressionLevel, $false);
}

它一直工作到foreach循环之前,但是在循环中它会产生以下错误:

Unable to find type [System.IO.Compression.CompressionLevel]: make sure that the assembly containing this type is loaded.
At line:4 char:65
+ $compressionLevel = [System.IO.Compression.CompressionLevel] <<<< ::Optimal;
+ CategoryInfo          : InvalidOperation: (System.IO.Compression.CompressionLevel:String) [], RuntimeException
+ FullyQualifiedErrorId : TypeNotFound

作为.NET 4.5 System.IO.Compression的一部分,我已经将它安装在系统上,但我仍然遇到这些错误.

我在Windows Server 2008 R2和PowerShell v2.0上.

我怎样才能使它工作？

Answer 1

请尝试使用Add-Type -AssemblyName System.IO.Compression.FileSystem.它更干净,并且不依赖于需要安装Visual Studio的引用程序集.

Answer 2

您可以手动将.NET类添加到PowerShell会话中.

[Reflection.Assembly]::LoadWithPartialName("System.IO.Compression.FileSystem");从脚本中删除并在顶部添加以下内容:

Add-Type -Path "C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\System.IO.Compression.FileSystem.dll"

或者在32位盒子上:

Add-Type -Path "C:\Program Files\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\System.IO.Compression.FileSystem.dll"

这假设.NET 4.5在您的系统上安装正常并且System.IO.Compression.FileSystem.dll实际存在.