CODEWITHSUNDEEP
c#asynchronouswmiremote-server
Mark Harwood
Mark Harwood

Reputation: 2415

Asynchronous Remote WMI Calls C#

I'm really struggling to get WMI data from a remote host in an asynchronous way. After a lot of research, I can't find any clear examples, Microsoft's documentation only has VB and C++ code and there are even articles explaining why it's a bad idea. I've come from PowerShell, with that I would just create a new runspace to get the information.

I currently have a WPF window that I want to remain responsive whilst querying the information before updating the window. I've currently only managed to use synchronous calls using CimSession.Create and QueryInstance.

I would really appreciate some help with this :)

Upvotes: 0

Views: 1184

Answers (2)

Mark Harwood
Mark Harwood

Reputation: 2415

After proposing the same question to the MSDN forums, I got the correct answer and thought I would share it here as well :) I have put comments into the code to explain what is happening:

//Used to define what is returned in the async results
public static CimAsyncMultipleResults<CimInstance> GetValues(CimSession _session)
{
    return _session.QueryInstancesAsync(@"root\cimv2", "WQL", "SELECT Username FROM Win32_ComputerSystem");
}

//This watches the async progress
class CimInstanceWatcher : IObserver<CimInstance>
{
    public void OnCompleted()
    {
        Console.WriteLine("Done");
    }

    public void OnError(Exception e)
    {
        Console.WriteLine("Error: " + e.Message);
    }

    public void OnNext (CimInstance value)
    {
        Console.WriteLine("Value: " + value);
    }
}

private static void Main()
{
    //Leaving cimsession creation as sync because is happens "instantly"
    CimSession Session = CimSession.Create("PC-NAME");
    //Creating a new watcher object
    var instanceObject = new CimInstanceWatcher();
    //Subscribing the watcher object to the async call
    GetValues(Session).Subscribe(instanceObject);
    Console.ReadLine();
}

Upvotes: 2

NicoRiff
NicoRiff

Reputation: 4883

You can use ORMi async methods to do async WMI work. For example:

WMIHelper helper = new WMIHelper("root\\CimV2");
List<Processor> processors = await helper.QueryAsync<Processor>().ToList();

Upvotes: 0

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