signalr Clients.Users(userIds).send(msg) not firing

问题

I have single R version 2.2.1. I implement custom Id Provider

public class ChatUserIdProvider : IUserIdProvider
{
    public string GetUserId(IRequest request)
    {
        if (request.User.Identity.IsAuthenticated)
        {
            Guid.Parse(request.User.Identity.GetUserId().ToString());
            var userId = request.User.Identity.GetUserId().ToString();
            return userId.ToString();
        }
        return "Un Known";
    }
}

I made a simple chat app and every think OK, but when I try to send a message to multi users the client event not firing here is hub function

public void SendToMany(string msg, List<string> userIds)
    {
        try
        {
           //db things here
            Clients.Users(userIds).sendMessage(msg);
        }
        catch (Exception ex)
        {
            Logs.Log(ex);
        }
    }

Startup

  GlobalHost.DependencyResolver.Register(typeof(IUserIdProvider), () => new ChatUserIdProvider ());
        app.MapSignalR();

$(function () {
   var chat = $.connection.chatHub;
    chat.client.sendMessage= function (msg) {
        $('.msgs').append('<div>'+ group.Name + '</div>');
        $('#' + group.Id).click();
    }
   $.connection.hub.start();

})

function BrodCast() {
    try {

        var chatids = new Array();
        $('.ckusergr').each(function () {
            if ($(this).is(':checked')) {
                chatids.push($(this).attr('iid'));
            }
        })
        chat.server.sendToMany($('.txtmsg').val(), chatids);
    } catch (e) {
        console.log(e)
    }
}

the problem with this line

public void SendToMany(string msg, List<string> userIds)
    {
        try
        {
           //db things here
            Clients.Users(userIds).sendMessage(msg); // Her is the Problem
        }
        catch (Exception ex)
        {
            Logs.Log(ex);
        }
    }

if I change to become like this every thing work great.

public void SendToMany(string msg, List<string> userIds)
    {
        try
        {
            //db things here
            foreach (string item in userIds)
            {
                Clients.User(item).sendMessage(msg);
            }
        }
        catch (Exception ex)
        {
            Logs.Log(ex);
        }
    }

回答1:

I had similar problem today and I find out when I send as parameter List<string> which contains all usernames into Clients.Users(list of usernames) somehow it will work also.

I found this by accident, maybe someone with better experiences may clarify why this is working since this should only accept IList<string> userIds

回答2:

First, you need to start your hub before declaring 'send' function.
Second, you should put your Broadcast function inside the main function which is declaring variable chat.

something like this should work :

$(function () {
   var chat = $.connection.chatHub;
    chat.client.sendMessage= function (msg) {
        $('.msgs').append('<div>'+ group.Name + '</div>');
        $('#' + group.Id).click();
    }
   $.connection.hub.start().done(function () {
        var chatids = new Array();
        $('.ckusergr').each(function () {
            if ($(this).is(':checked')) {
                chatids.push($(this).attr('iid'));
            }
        })
        chat.server.sendToMany($('.txtmsg').val(), chatids);
    });
})

来源：https://stackoverflow.com/questions/42109363/signalr-clients-usersuserids-sendmsg-not-firing

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signalr