Access DLL classes using PowerShell - class

Question

I'm trying to use PowerShell to control a Bluethooth dongle which has API document and dll released.
There is an MasterEmulator class under namespace "Nordicsemi" available, I tested it with C#, I can new an instance with MasterEmulator constructor like below, all other functions work fine too.
MasterEmulator masterEmulator = new MasterEmulator();
However I try to do the same with PowerShell with below script.
[System.Reflection.Assembly]::LoadFile($fullpath)
$MasterEmulatorInstance = New-Object Nordicsemi.MasterEmulator
And I get below error:
+ $MasterEmulatorInstance = New-Object Nordicsemi.MasterEmulator
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [New-Object]，MethodInvocationException
+ FullyQualifiedErrorId : ConstructorInvokedThrowException,Microsoft.PowerShell.Commands.NewObjectCommand
The dll seems to be loaded correctly, I just can't get the constructor to work, I've checked other related posts but New-Object seems to be the only way to access a class from a .Net dll. Not sure what I'm doing wrong here, any hint would be appreciated, thanks.
Update:
Thanks for the replies, I tried more methods of loading assembly like below.
[System.Reflection.Assembly]::LoadFrom($fullpath) | Out-Null
and also without Out-Null cmdlet
[System.Reflection.Assembly]::LoadFrom($fullpath)
the output shows
GAC Version Location
--- ------- --------
False v4.0.30319 D:\Test\MasterEmulator.dll
and still gives me the same error, I also tried below methods.
[reflection.assembly]::loadwithpartialname("MasterEmulator.dll") | Out-Null
Add-Type -Path $fullpath
and still no luck, all of these methods give me the exact same error when I call the constructor.
New-Object : 以 "0" 引數呼叫 ".ctor" 時發生例外狀況: "無法載入檔案或組件 'IronPython, Version=2.7.0.40, Culture=neutral, PublicKeyToken=7f709c5b713576e1' 或其相依性的其中之一。 系統找不到指定的檔案。"
位於 D:\Test\test.ps1:3 字元:27
+ $MasterEmulatorInstance = New-Object Nordicsemi.MasterEmulator
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [New-Object]，MethodInvocationException
+ FullyQualifiedErrorId : ConstructorInvokedThrowException,Microsoft.PowerShell.Commands.NewObjectCommand
sorry about the Chinese in the error message since the system I'm running is in Chinese, any other ideas?

Answer 1

Try using LoadFrom. Here is how I load MSTranslitTools.DLL which does transliteration.
function load_transliterate(){
$dll = Resolve-Path ".\tools\transliterate\MSTranslitTools.DLL"
[System.Reflection.Assembly]::LoadFrom($dll) | out-null
$specfile = Resolve-Path "Serbian Cyrillic to Latin.tms"
$tspec = [System.NaturalLanguage.Tools.TransliteratorSpecification]::FromSpecificationFile($specfile)
$script:trans = [System.NaturalLanguage.Tools.Transliterator]::FromSpecification($tspec)
Write-Verbose "Transliteration: $($trans.Input) -> $($trans.Output)"
}
Read about the difference here. See also this SO question.