Calling SignalR hub clients from elsewhere in system

Question

I've set up a SignalR hub to communicate between the server and client. The hub server side code is stored in a class called Hooking.cs. What I want is to be able to call a method defined in Hooking.cs to allow me to broadcast messages to any connected clients from anywhere in my application. It seems that a new instance of Hooking.cs is created for every client/server call, so I had hoped that I would be able to use something like

var hooking = new Hooking(); hooking.Test(); 

with the method Test() defined in Hooking.cs such as

public static void Test() {     Clients.test() } 

and with a the client side javascript

var hooking = $.connection.hooking; hooking.test = function() { alert("test worked"); }; $.connection.hub.start() 

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Unfortunately it isn't that simple, as Clients is not static, so not accessible from a static method.

Looking through the SignalR source code I came across a method that looked promising, Hubs.Invoke(string hubName, string method, params object[] args), so I would hope I could use something such as Hubs.Invoke("Hooking", "Test") but I can't make it work.

Any help with this would be hugely appreciated

Answer 1

This is the correct way for SignalR 2.x:

var context = GlobalHost.ConnectionManager.GetHubContext<MyHub>(); context.Clients.All.addMessage(message); 

Basically, you can use the dependency resolver for the current host to resolve the IConnectionManager interface which allows you to get ahold of the context object for a hub.

Further information can be found in the official documentation.

Answer 2

Hub.GetClients has disappeared in version 0.4.0.

From the wiki you can now use:

IConnectionManager connectionManager = AspNetHost.DependencyResolver.Resolve<IConnectionManager>(); dynamic clients = connectionManager.GetClients<MyHub>();