从.NET客户端连接时未调用SignalR OnConnected

Question

I'm using SignalR and have a Hub where I've overwritten the OnConnected method. The reason is, the server publishes data every 60 seconds. But when a new client connects, I want to publish the data immediately.

In a simplified form:

public class CustomerPublisher : Hub
{
    public void Publish(Customer customer)
    {
        Clients.All.receive(customer);
    }

    public override Task OnConnected()
    {
        return base.OnConnected();
    }
}

The OnConnected method is never called (I tested by debugging). I've read in several places (like here ) that the client needs to have a connected handler, like:

$.connection.onlineHub.client.connected = function(){...}

However, I have a WPF client, so in .NET I tried adding this, on top of the event I was already handling:

hubProxy.On<object>("receive", OnCustomerReceived); // this line was already present
hubProxy.On<object>("connected", OnConnected); // I added this

This didn't help. But I do have a connection, because after some time, I start receiving data.

Is there anything I'm missing? How can I get SignalR to call the OnConnected method when my .NET client connects?

Answer 1

You can try to use StateChanged event like this :

Connection.StateChanged += Connection_StateChanged;
void Connection_StateChanged(StateChange obj)
{
    if (obj.NewState == ConnectionState.Connected)
    {
          //do somethign here
    }
}

You ll receive Connecting and Connected states

Answer 2

In my case, the problem was Autofac. I had set it up in my own way (due to the way I had set up WCF duplex before using SignalR). But it is important to follow the docs . Even though a connection was made, and my client received data, I never entered the OnConnected method. After following the documentation, I the method was called.