Passing strongly typed Hubs in SignalR

Question

I\'ve just updated some SignalR references and things have changed somewhat in order to allow for generically typed Hubs Hub. In the existing examples and

Answer 1

Or take look at:

https://github.com/Gandalis/SignalR.Client.TypedHubProxy

It comes with more features than the TypeSafeClient mentioned above.

Answer 2

Take a look at:

https://github.com/i-e-b/SignalR-TypeSafeClient

May be useful!

Answer 3

In .NET Core Web App you can inject strongly typed signalR hub context like this

public interface IClient
{
    Task ReceiveMessage(string message);
}

public class DevicesHub : Hub<IClient>
{
}

public class HomeController : ControllerBase
{
    private readonly IHubContext<DevicesHub, IClient> _devicesHub;

    public HomeController(IHubContext<DevicesHub, IClient> devicesHub)
    {
        _devicesHub = devicesHub;
    }       

    [HttpGet]
    public IEnumerable<string> Get()
    {
       _devicesHub.Clients
          .All
          .ReceiveMessage("Message from devices.");

       return new string[] { "value1", "value2" };
    }
}

Answer 4

There is now a new overload of GetHubContext that takes two generic parameters. The first is the Hub type like before, but the second generic parameter is TClient (which is the T in Hub<T>).

Assuming that StockTickerHub is defined as follows:

public class TypedDemoHub : Hub<IClient>

Then

GlobalHost.ConnectionManager.GetHubContext<StockTickerHub>().Clients

becomes

GlobalHost.ConnectionManager.GetHubContext<StockTickerHub, IClient>().Clients

The type returned by the new overload to GetHubContext would be IHubContext<IClient> and the Clients property would be IHubConnectionContext<IClient> instead of IHubConnectionContext<dynamic> or IHubConnectionContext<StockTickerHub>.