Similar to what we just did in order to exclude specific connections from the set of all the connected clients, we can provide exceptions in the context of a specific group. We can broadcast to all the connections in a given group, excluding a list of specific ConnectionId values that we want to omit.
Before writing the code of this recipe, we create a new empty web application, which we'll call Recipe12.
Let's prepare our project by performing the following steps:
We add a Hub called
EchoHub.Let's then add the usual OWIN Startup class named
Startup, with aConfiguration()method callingapp.MapSignalR().Let's edit Hub's content using the following code:
using Microsoft.AspNet.SignalR; using Microsoft.AspNet.SignalR.Hubs; namespace Recipe12 { [HubName("echo")] public class EchoHub : Hub { public void Subscribe(string groupName) { Groups.Add(Context.ConnectionId, groupName...