SignalR 集线器外部的客户端连接事件

Question

我正在寻找一种简单的方法来通知 SignalR 集线器外部的代码关于新的客户端连接。

我该怎么做？

Answer 1

您需要在您的中心类中使用Dependency Injection。
一个易于与 SignalR 集成的IoC Container 是Autofac：

public class NotifyHub : Hub
{
    private readonly ILifetimeScope _hubLifetimeScope;
    private readonly IHubService _hubService;

    public NotifyHub(ILifetimeScope lifetimeScope)
    {
        // Create a lifetime scope for the hub.
        _hubLifetimeScope = lifetimeScope.BeginLifetimeScope("AutofacWebRequest");

        // Resolve dependencies from the hub lifetime scope.
        _hubService = _hubLifetimeScope.Resolve<IHubService>();
    }

    public override Task OnConnected()
    {
        string name = Context.User.Identity.Name;
        //Or whatever you want to send
        _hubService.CustomNotify(name, Context.ConnectionId);
        return base.OnConnected();
    }

    protected override void Dispose(bool disposing)
    {
        // Dipose the hub lifetime scope when the hub is disposed.
        if (disposing && _hubLifetimeScope != null)
        {
            _hubLifetimeScope.Dispose();
        }
        base.Dispose(disposing);
    }
}

另外，你需要provide dependency injection integration for SignalR hubs:

var builder = new ContainerBuilder();
//other IoC registrations
builder.RegisterType(typeof(HubService)).As(typeof(IHubService)).InstancePerRequest();
builder.RegisterType<GaugeHub>().ExternallyOwned();

var container = builder.Build();
DependencyResolver.SetResolver(new AutofacDependencyResolver(container));
GlobalHost.DependencyResolver = new Autofac.Integration.SignalR.AutofacDependencyResolver(container);