Dependency Injection in SignalR – ASP.NET SignalR

这篇博文主要关于ASP.NET SignalR & MVC 的依赖注入.

以下是在使用前需要查看的关于Autofac的文档, 博文内会说明如何实现.

Dependency Injection in SignalR: this

Dependency Injection in Middleware for ASP.NET OWIN: this

Set the Dependency Resolver for ASP.NET SignalR: this

Set the Dependency Resolver for ASP.NET MVC: this

说明

由于SignalR使用了中间件, 所以需要查看Autofac关于owin的文档.

需要引用的Autofac包:

  <package id="Autofac" version="3.5.0" targetFramework="net45" />
  <package id="Autofac.Mvc5" version="3.3.4" targetFramework="net45" />
  <package id="Autofac.Owin" version="4.0.0" targetFramework="net45" />
  <package id="Autofac.SignalR" version="3.0.2" targetFramework="net45" />

MVC实现

application_start():

protected void Application_Start()
{
            var builder = new ContainerBuilder();
            var container = builder.Build();

// register IModel

builder.RegisterType<Model>().As<IModel>();

            builder.Update(container);

            // for mvc
            DependencyResolver.SetResolver(new Autofac.Integration.Mvc.AutofacDependencyResolver(container));

            // for signalR
            GlobalHost.DependencyResolver = new Autofac.Integration.SignalR.AutofacDependencyResolver(container);

}

IModel & Model:

public interface IModel
    {
        string Name { get; }
    }

    public class Model : IModel
    {
        public string Name => "this is MODEL.";
    }

接下来在控制器中使用已注入的IModel:

ModelController:

public class ModelController : Controller
    {
        private readonly IModel _model;

        public ModelController(IModel model)
        {
            _model = model;
        }

        public ActionResult Name()
        {
            return Json(_model.Name);
        }
    }

结果:

SignalR实现

ModelHub:

当有新的客户端成功连接后, 系统会将Model.Name响应给客户端.

public class ModelHub : Hub
    {
        private readonly IModel _model;

        public ModelHub(IModel model)
        {
            _model = model;
        }


        public override Task OnConnected()
        {
            Clients.Caller.broadcast(_model.Name);
            return base.OnConnected();
        }
    }

结果:

注意:

如果发现 GlobalHost.ConnectionManager.GetHubContext<ConsoleHub>().Clients.All.boardcast() 方法无效, 则将HubConfiguration中的Resolver去掉即可.

HubConfiguration config = new HubConfiguration();
            config.EnableJavaScriptProxies = true;


            //You should remove your dependency resolver code from here to Global.asax Application_Start method. Before setting the MVC properties.
            //config.Resolver = new SignalrDefaultDependencyResolver(UnityConfig.Container); // your dependency resolver
            //

解决方案来源: Call method from outside hub using GlobalHost.ConnectionManager.GetHubContext doesn't work