NetworkListManager does not work to receive events in .Net MAUI project

[NilsHoyer]

I'm trying to catch the events of the NetworkListManager, and it works fine for me in a simple .Net Core 8.0 project. But not for a .Net MAUI project.

Can you imagine, that this is a problem of your code? If not, I will try to find a Microsoft member to take a look at this.

My code:

internal class MyClass : INetworkConnectionCostEvents
{
    public void Initialize()
    {
        var networkListManager = new NetworkListManager();

        var guid = typeof(INetworkConnectionCostEvents).GUID;
        ((IConnectionPointContainer)networkListManager).FindConnectionPoint(ref guid, out var connectionPoint);
        connectionPoint.Advise(this, out var cookie);
    }

    public HRESULT ConnectionCostChanged(Guid connectionId, NLM_CONNECTION_COST newCost)
    {
        return 0;
    }

    public HRESULT ConnectionDataPlanStatusChanged(Guid connectionId)
    {
        return 0;
    }
}

Both methods will never executed.

[dahall]

That is curious. There is nothing too special about this implementation. Threading model? COM initialization? Annotating the class with [ComVisible(true)] maybe?

[NilsHoyer]

[ComVisible(true)] and CoInitializeEx() doesn't help.

Now I will try to get the INetwirkLostManager object on the recommended way:

INetworkListManager *pNetworkListManager = NULL; 
HRESULT hr = CoCreateInstance(CLSID_NetworkListManager, NULL,
        CLSCTX_ALL, IID_INetworkListManager,
        (LPVOID *)&pNetworkListManager);

If this doesn't work, I will mention this issue to the MAUI developers.

[NilsHoyer]

I didn't find a solution, so I will inform the MAUI project about this issue.