Powershell 7.x : Cannot use type from dll (built for netstandard2.0) #12052
Description
Steps to reproduce
Provided that there is a dotnet core sdk istalled, run script as below.
What script does:
- Displays some debug stuff (dotnet core version, powershell version)
- Crates some directories e.g. where published library will be copied
- Creates ad hoc dot net core class lib project (targeted for
netstandard2.0) - Compiles the project into dll
- Loads the dll into powershell
- Calls function
Hellofrom the dll and expects to receive predefined output (== "Works!")
Function ShowErrorDetails
{
param(
$ErrorRecord = $Error[0]
)
$out=""
$out+= $($ErrorRecord | Format-List -Property * -Force | out-string)
$out+= $($ErrorRecord.InvocationInfo | Format-List -Property * | out-string)
$Exception = $ErrorRecord.Exception
for ($depth = 0; $Exception -ne $null; $depth++)
{
$out+= $("$depth" * 80)
$out+= $($Exception | Format-List -Property * -Force | out-string)
$Exception = $Exception.InnerException
}
# emit return object
$out
}
$myLibName="MyLib"
$myLibDllName="${myLibName}.dll"
$csProjName = "${myLibName}.csproj"
$thisDir = Get-Location
$workdir = Join-Path $thisDir "workdir"
$libraryCodeDir = Join-Path $workdir $myLibName
$csProjFilePath = Join-Path $libraryCodeDir $csProjName
$publishedOutputDir = Join-Path $workdir "published"
$dllFilePath = Join-Path $publishedOutputDir $myLibDllName
Write-Host "thisDir : '$thisDir'"
Write-Host "myLibName : '$myLibName'"
Write-Host "csProjName : '$csProjName'"
Write-Host "workdir : '$workdir'"
Write-Host "libraryCodeDir : '$libraryCodeDir'"
Write-Host "csProjFilePath : '$csProjFilePath'"
Write-Host "publishedOutputDir : '$publishedOutputDir'"
Write-Host "myLibDllName : '$myLibDllName'"
Write-Host "dllFilePath : '$dllFilePath'"
Write-host "------ >>>>> Powershell version : "
$PsVersionTable | Out-Host
Write-Host "------ >>>>> Dotnet core version: "
dotnet --info
Write-host "------ >>>>> Creating $libraryCodeDir..."
New-item $libraryCodeDir -ItemType Directory -Force
Write-Host "`n------ >>>>> Creating library template in '$libraryCodeDir'"
dotnet new classlib --name $myLibName --output $libraryCodeDir --framework "netstandard2.0" --force
$expectedOutput = "Works!"
$codeContent = @"
public static class MyClass
{
public static string Hello()
{
return "${expectedOutput}";
}
}
"@
try
{
Set-Content -Path $libraryCodeDir/Class1.cs -Value $codeContent
dotnet publish -c Debug -o ${publishedOutputDir} ${csProjFilePath}
# if compilation was not successful
if($global:LASTEXITCODE -ne 0 )
{
Write-Error "------ >>>>> Compilation failed, cannot continue with the script.."
Exit 1
}
else
{
Write-Host "------ >>>>> OK: compilation successful"
}
Write-Host "------ >>>>> Loading library..."
$bytes = [System.IO.File]::ReadAllBytes($dllFilePath)
$loadedLib = [System.Reflection.Assembly]::Load($bytes)
$loadedLib.GetTypes() | Out-Host
$functionCallResult = [MyClass]::Hello()
if($functionCallResult -eq $expectedOutput )
{
Write-Host "------ >>>>> SUCCESS: Function call returned expected result"
}
else
{
Write-Error "------ >>>>> FAILURE: Function call unxpected result '${functionCallResult}' while expecting '${expectedOutput}'"
Exit 1
}
}
catch {
ShowErrorDetails | Out-Host
}
Expected behavior
After the script finishes , user should see line like
------ >>>>> SUCCESS: Function call returned expected result
Actual behavior
I've added a debug function ShowErrorDetails to show full error details (code taken from book Windows Powershell in action 3rd edition) if something goes wrong.
Powershell 7.0 cannot find the type from the library and at the end of error output it prints something like:
00000000000000000000000000000000000000000000000000000000000000000000000000000000
ErrorRecord : Unable to find type [MyClass].
WasThrownFromThrowStatement : False
TargetSite : Void CheckActionPreference(System.Management.Automation.Language.FunctionContext, System.Exception)
StackTrace : at System.Management.Automation.ExceptionHandlingOps.CheckActionPreference(FunctionContext funcContext, Exception exception)
at System.Management.Automation.Interpreter.ActionCallInstruction`2.Run(InterpretedFrame frame)
at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
Message : Unable to find type [MyClass].
Data : {System.Management.Automation.Interpreter.InterpretedFrameInfo}
InnerException :
HelpLink :
Source : System.Management.Automation
HResult : -2146233087
Environment data
The issue is related only for powershell 7:
I tested it on :
Windows
Name Value
---- -----
PSVersion 7.0.0
PSEdition Core
GitCommitId 7.0.0
OS Microsoft Windows 10.0.17763
Platform Win32NT
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0
Ubuntu:
Name Value
---- -----
PSVersion 7.0.0
PSEdition Core
GitCommitId 7.0.0
OS Linux 5.3.0-40-generic #32~18.04.1-Ubuntu SMP Mon Feb 3 14:05:59 UTC 2020
Platform Unix
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0
I have verified that this correctly WORKS platforms such as
windows powershell 5.1
Name Value
---- -----
PSVersion 5.1.17763.1007
PSEdition Desktop
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
BuildVersion 10.0.17763.1007
CLRVersion 4.0.30319.42000
WSManStackVersion 3.0
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
windows powershell core 6.2.4
Name Value
---- -----
PSVersion 6.2.4
PSEdition Core
GitCommitId 6.2.4
OS Microsoft Windows 10.0.17763
Platform Win32NT
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0
ubuntu powrshell core 6.2.4
Name Value
---- -----
PSVersion 6.2.4
PSEdition Core
GitCommitId 6.2.4
OS Linux 5.3.0-40-generic #32~18.04.1-Ubuntu SMP Mon Feb 3 14:05:59 UTC 2020
Platform Unix
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0
ubuntu_pwsh6.2.4_output.txt
ubuntu_pwsh7_output.txt
windows_powershell_output.txt
windows_pwsh6.2.4_output.txt
windows_pwsh7_output.txt