我的 PowerShell 脚本使用哪个 .NET 版本？

Question

I'd like to use .NET in some PowerShell scripts I'm about to write -- how do I know/declare which version of .NET I'm dealing with when these scripts run?

And is it possible to choose against which version of .NET my script will run?

Answer 1

On PowerShell 2.0, just take a peek at the $PSVersionTable variable:

PS> $psversiontable

Name                           Value
----                           -----
CLRVersion                     2.0.50727.4927
BuildVersion                   6.1.7600.16385
PSVersion                      2.0
WSManStackVersion              2.0
PSCompatibleVersions           {1.0, 2.0}
SerializationVersion           1.1.0.1
PSRemotingProtocolVersion      2.1

On PowerShell 1.0, use [System.Environment]::Version :

PS> [Environment]::Version

Major  Minor  Build  Revision
-----  -----  -----  --------
2      0      50727  4927

Answer 2

...no, you cannot choose which .NET version you can run the script under -- George Howarth

Woah, that's not true! You can specify which version of .NET that PowerShell uses. The key is the .NET standard application configuration file, which takes the form [appname].exe.config. You can drop that in the same directory as most .NET applications -- including the PowerShell and PowerShell ISE executables -- and the CLR will automatically load any recognizable options specified within the configuration file. One of those options is the CLR version you want the application to use.

This is documented in detail in the question: How can I run PowerShell with the .NET 4 runtime? . In particular, see Emperor XLII 's post.

Answer 3

To get the .NET version:

[System.Reflection.Assembly]::GetExecutingAssembly().ImageRuntimeVersion

...which is, by default, the version of the CLR the assembly ( System.Management.Automation.dll ) compiled under.

And no, you cannot choose which .NET version you can run the script under.

Answer 4

The .NET version can be inferred from the version of mscorlib. So you can do the following in PowerShell to output the current version of .NET:

$a = [System.Reflection.Assembly]::Load("mscorlib")
$a.GetName().Version

Answer 5

This is an old thread, and the answer I am going to post now will not work for .NET versions from from before circa 2017.

There is a new FrameworkDescription property .

Try:

[System.Runtime.InteropServices.RuntimeInformation]::FrameworkDescription

Note, however, on some versions of Windows PowerShell (not sure about newer PowerShell 6 and 7 etc.) there are two different types System.Runtime.InteropServices.RuntimeInformation in different assemblies. And only one of them has the property: So you must qualify:

[System.Runtime.InteropServices.RuntimeInformation, Microsoft.Powershell.PSReadline]::FrameworkDescription   # does not exist
[System.Runtime.InteropServices.RuntimeInformation, mscorlib]::FrameworkDescription   # good

Answer 6

Check out the article Hey, Scripting Guy! How Do I Check Which Version of Windows PowerShell I'm Using? . It shows where in the registry you can check to determine this.

Answer 7

PS > [Runtime.InteropServices.RuntimeEnvironment]::GetRuntimeDirectory()
C:\\Windows\\Microsoft.NET\\Framework\\v2.0.50727\\

Answer 8

I've found out that you can look for that information in the directory C:\\Windows\\Microsoft.NET\\Framework:

cd C:\Windows\Microsoft.NET\Framework
dir

The directories inside that one will tell you the versions of the framework installed.

Mode                LastWriteTime     Length Name
----                -------------     ------ ----
d----        14/07/2009     10:48            3082
d----        14/07/2009      4:37            v1.0.3705
d----        14/07/2009      4:37            v1.1.4322
d----        25/06/2010     17:26            v2.0.50727
d----        14/07/2009     10:48            v3.0
d----        14/07/2009     10:48            v3.5