LINQPad7 unable import Powershell Hyper-V module to execute script

sdflysha
sdflysha
in General

Let's say this code:

string _scr = ("Get-VM");
var _ps = PowerShell.Create();
_ps.AddScript(_scr);
Collection<PSObject> _cObj = _ps.Invoke();

if (_ps.HadErrors)
{
    Console.WriteLine(_ps.Streams.Error[0].ToString());
}

foreach (PSObject _vm in _cObj)
{
    Console.WriteLine(_vm);
}

Is able to run in Visual Studio 2022 .NET Core 6.0 project (Install NuGet: Microsoft.PowerShell.SDK):

Also able to run in LINQPad 5(By reference another assembly(install NuGet: Microsoft.PowerShell.5.1.ReferenceAssemblies):

But confirmed unable to run in my latest LINQPad 7.4.2:(Install NuGet: Microsoft.PowerShell.SDK)

After investigation, this seems related to Import-Module, if we don't import any module, code will execute perfectly fine in LINQPad 7:

But code still unable to run in LINQPad 7 even if we write Import-Module Hyper-V.

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Comments

  • sdflysha
    sdflysha

    @JoeAlbahari Confirmed that old LINQPad6 also does not support Microsoft.Powershell.SDK:

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  • sdflysha
    sdflysha
    edited June 2022

    If we reference to NuGet package: System.Management.Automation instead of Microsoft.PowerShell.Sdk, the error is different (PSSnapInException):

    Cannot load PowerShell snap-in Microsoft.PowerShell.Diagnostics because of the following error: Could not load file or assembly 'C:\Users\ZhouJie\.nuget\packages\System.Management.Automation\7.2.4\runtimes\win\lib\net6.0\Microsoft.PowerShell.Commands.Diagnostics.dll'. 系统找不到指定的文件。

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  • sdflysha
    sdflysha

    Confirmed even using Visual Studio 2022, there is also same error for System.Management.Automation, so there have to be a problem within LINQPad 7 and Microsoft.PowerShell.SDK:

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  • sdflysha
    sdflysha

    The only workaround I can use, is calling powershell exe, @JoeAlbahari I think this one you can take a look in LINQPad side.

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  • JoeAlbahari
    JoeAlbahari

    That library appears to load assemblies directly into the default ALC. This makes it incompatible with LINQPad - or any program that runs in a non-default ALC.

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  • sdflysha
    sdflysha

    @JoeAlbahari Thank you pointing out the direction, just wondering is it possible to find a workaround and load these assemblies into non-default AssemblyLoadContext and make it work again? Like this:

    HashSet<string> asmFullNames = Util.AssemblyLoadContext
    .Assemblies
    .Select(x => x.FullName)
    .ToHashSet();
foreach (Assembly asm in AssemblyLoadContext.Default.Assemblies)
{
    if (!asmFullNames.Contains(asm.FullName))
    {
        Util.AssemblyLoadContext.LoadFromAssemblyName(asm.GetName());
    }
}
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  • JoeAlbahari
    JoeAlbahari

    The problem is that the assemblies load into both ALCs. I've logged an issue here:
    https://github.com/PowerShell/PowerShell/issues/17492

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