How to get output of PowerShell's Get-WmiObject in C#

Question

I need to get which network interface is connected to which network. I found that this information is accessible in MSFT_NetConnectionProfile. Unfortunatelly I cannot access it directly from C# (I get ManagementException: Provider load failure on computer where it should run) but when I access it from PowerShell, it works. Then my idea is to run PowerShell command from C# but I cannot get the result.

using System.Management.Automation;

string command = "Get-WmiObject -Namespace root/StandardCimv2 -Class MSFT_NetConnectionProfile | Select-Object -Property InterfaceAlias, Name";

PowerShell psinstance = PowerShell.Create();
psinstance.Commands.AddScript(command);
var results = psinstance.Invoke();

foreach (var psObject in results)
{
    /* Get name and interfaceAlias */
}

The code runs without errors but results are empty. I tried even adding Out-File -FilePath <path-to-file> with relative and absolute file path but no file was created. I even tried old >> <path-to-file> but without luck. When I added Out-String then there was one result but it was empty string.

When I tested the commands directly in PowerShell then it worked. Is there a way how to get it in C#?

Isn't just psinstance.AddScript(command); instead of psinstance.Commands.AddScript(command); ? — Santiago Squarzon
– Santiago Squarzon, Commented May 17, 2022 at 14:44
@SantiagoSquarzon It is possible, I think that I tried both ways but both failed. — Jirka Picek
– Jirka Picek, Commented May 19, 2022 at 10:10

Nick Papadiochos · Accepted Answer · 2022-05-17 16:07:39Z

1

The PS commands must be constructed in a builder-pattern fashion. Additionally, in PS Core the Get-WmiObject has been replaced by the Get-CimInstance CmdLet.

The following snippet is working on my env:

var result = PowerShell.Create()
                       .AddCommand("Get-CimInstance")
                       .AddParameter("Namespace", "root/StandardCimv2")
                       .AddParameter("Class", "MSFT_NetConnectionProfile")
                       .Invoke();

answered May 17, 2022 at 16:07

Nick Papadiochos

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1 Comment

Jirka Picek Over a year ago

Thank you, it worked, I just had to install Microsoft.PowerShell.SDK package. Without it I got

System.Management.Automation.CommandNotFoundException: The 'Get-CimInstance' command was found in the module 'CimCmdlets', but the module could not be loaded. For more information, run 'Import-Module CimCmdlets'.

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