I wrote this PowerShell script to archive all log files created during a certain date range.
$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);
}
It works until the foreach
loop, but once in the loop it gives these errors:
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
As System.IO.Compression
is part of .NET 4.5, I have it installed on the system, but I still get these errors. I am on Windows Server 2008 R2 and using PowerShell v2.0
How can I make this work?
Try using Add-Type -AssemblyName System.IO.Compression.FileSystem
instead. It is cleaner and does not have a dependency on the reference assemblies which need an installation of Visual Studio.
You can manually add a .NET class to your PowerShell session.
Remove [Reflection.Assembly]::LoadWithPartialName("System.IO.Compression.FileSystem");
from your script and add the following at the very top:
Add-Type -Path "C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\System.IO.Compression.FileSystem.dll"
Or on a 32-bit box:
Add-Type -Path "C:\Program Files\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\System.IO.Compression.FileSystem.dll"
This presumes .NET 4.5 installed OK on your system and System.IO.Compression.FileSystem.dll
actually exists.
Also, make sure to check your $pshome exe.config file. I had an issue once where Powershell ISE refused to load a .NET assembly, because the config file had .NET 2.0 listed instead of 4.
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