我正在尝试使用SignalR从控制器向客户端组发送消息 . 当我的某个控制器发生事件时，我需要使用信号器集线器推送一条消息，以便在我的客户端屏幕上显示为警报 . 我知道这里有很多问题，我已经阅读并尝试了很多 . 由于我是SignalR的新手，他们中的一些人甚至已经帮我把东西放到位 . 目前一切似乎都到位了 . 客户端可以连接到集线器并加入组，控制器可以从集线器调用方法 . 但客户端从未收到消息，我无法弄清楚原因 . 我怀疑控制器调用的集线器方法没有“看到”客户端，但我无法理解什么是错的 .

Hub的代码：

public static class UserHandler
{
    public static HashSet<string> ConnectedIds = new HashSet<string>();
}

[HubName("myHub")]
public class MyHub : Hub
{
    private static IHubContext hubContext = GlobalHost.ConnectionManager.GetHubContext<MyHub>();
    public void Notify(string groupName, string message)
    {
        Clients.Group(groupName).displayNotification(message);
    }

    public static void Static_Notify(string groupName, string message)
    {
        var toto = UserHandler.ConnectedIds.Count();
        hubContext.Clients.Group(groupName).displayNotification(message);
        hubContext.Clients.All.displayNotification(message);//for testing purpose
    }

    public Task JoinGroup(string groupName)
    {
        return Groups.Add(Context.ConnectionId, groupName);
    }

    public Task LeaveGroup(string groupName)
    {
        return Groups.Remove(Context.ConnectionId, groupName);
    }

    public override Task OnConnected()
    {
        UserHandler.ConnectedIds.Add(Context.ConnectionId);
        return base.OnConnected();
    }

    public override Task OnDisconnected(bool StopCalled)
    {
        UserHandler.ConnectedIds.Remove(Context.ConnectionId);
        return base.OnDisconnected(StopCalled);
    }
}

这是来自我的控制器的电话：

//(For simplification and readability I define here variables actually obtained by treating some data )
//I already checked that problem did not come from missing data here
string groupName = "theGroupName";
string message = "My beautifull message.";

//prepare signalR call
var context = GlobalHost.ConnectionManager.GetHubContext<MyHub>();

//Following commented lines are different attempts made based on exemples and answers I found here and on others sites.
//The uncommented one is the one in use at the moment and is also based on an answer (from SO i think)

//context.Clients.Group(_userEmail).displayNotification(message);
//context.Clients.Group(_userEmail).Notify(_userEmail,message);
  MyHub.Static_Notify(_userEmail, message);

这是客户端代码：

$(document).ready(function () {
    var userGroup = 'theGroupName';
    $.connection.hub.url = 'http://localhost/SignalRHost/signalr';
    var theHub = $.connection.myHub;
    console.log($.connection)
    console.log($.connection.myHub)

    theHub.client.displayNotification = function (message) {
        console.log('display message');
        alert(message);
    };

    $.connection.hub.start()
        .done(function () {
            theHub.server.joinGroup(userGroup);
            console.log("myHub hub started : " + $.connection.hub.id)
            console.log(theHub)
        })
        .fail(function () {
            console.log('myHub hub failed to connect')
        });

});

请帮助我理解我无法理解的逻辑或我错过的错误 .

EDIT :

回答Alisson的评论：Startup.cs我忘记了

public void Configuration(IAppBuilder app)
    {
        app.Map("/signalr", map =>
        {
            map.UseCors(CorsOptions.AllowAll);
            var hubConfiguration = new HubConfiguration { };
            map.RunSignalR();
        });
    }

重要的事情我也忘了提到：

• 控制器，集线器和客户端是3个不同的项目（因为全局应用程序架构我不得不分离集线器逻辑）所有都在我的localhost IIS上但在不同的端口上

• 我在"OnConnected"和"onDiconnected"事件上设置了断点，客户端正常连接和断开连接