polymorphism with interface doesnt work

[FKrotkih]

If we are using derived class that implements an interface throught base type or that interface, then polymorphism doesnt work. It works only in case using derived type explicitly. "public new" it is not enough. The way to go is to explicitly implement the part of the interface that you want to override. https://stackoverflow.com/questions/12314990/override-method-implementation-declared-in-an-interface

[jeikabu]

Interesting. Thanks for the fix, give me a few days to test it.
Did you have a snippet that demonstrates the issue/bug?

[FKrotkih]

I don't have ready spippet, but i can describe what to do. We need C++ (to get the original pair1 protocol) and C# parts.

On C# side do:

var nngctx = new NngLoadContext(System.IO.Path.GetDirectoryName(typeof(Program).Assembly.Location));
var factory = NngLoadContext.Init(nngctx, "nng.Factories.Latest.Factory");
var socket = factory.PairOpen().Unwrap();
socket.Notify(nng.Native.Defines.NngPipeEv.AddPre, PipeEventCallback, IntPtr.Zero);
var context = socket.CreateAsyncContext(factory).Unwrap();
var listener = socket.ListenerCreate("tcp://*:5000").Unwrap();
listener.Start();
stoppingToken.Register(() =>{ context.Aio.Cancel(); });
while (!stoppingToken.IsCancellationRequested) {
    var msg = await context.Receive(stoppingToken);
}

On C++ side do:

nng_socket socket;
nng_dialer dialer;
int rv = nng_pair1_open(&socket);
rv = nng_pipe_notify(socket, NNG_PIPE_EV_ADD_POST, pipe_callback, 0);
rv = nng_dial(socket, "tcp://*:5000", &dialer, NNG_FLAG_NONBLOCK);
// waiting for pipe_callback call... it means that connection has estabilished, and all is ok
// otherwise it means that there are two different protocols 'pair0' (we set "nng.Factories.Latest.Factory", but it still calls Pair0Open) and 'pair1'