# Microsoft.AspNetCore.SignalR

``` diff
 namespace Microsoft.AspNetCore.SignalR {
     public class HubInvocationContext {
-        public HubInvocationContext(HubCallerContext context, string hubMethodName, object[] hubMethodArguments);

     }
+    public interface IHubContext {
+        IHubClients Clients { get; }
+        IGroupManager Groups { get; }
+    }
-    public interface IHubContext<THub> where THub : Hub
+    public interface IHubContext<out THub> where THub : Hub
 }
```

