.Net Framework, WebApi and SignalR

Question

I have created a ASP.NET Web Application (.Net Framework) in VS2017, I have selected an Empty project and ticked the Web API checkbox. I don't want MVC. I install from Nuget Microsoft.AspNet.SignalR. All is well. Then I

Add an OWIN Startup class and add the line app.MapSignalR(); in the Configuration method.

using Microsoft.Owin;
using Owin;

[assembly: OwinStartup(typeof(WebApplication4.Startup))]

namespace WebApplication4
{
    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            app.MapSignalR();
        }
    }
}

I create a Hub called MyTestHub with a single method Activate.

using Microsoft.AspNet.SignalR;

namespace WebApplication4
{
    public class MyTestHub : Hub
    {
        public string Activate()
        {
            return "Monitor Activated";
        }
    }
}

I create an html page to test with the following:

<script src="Scripts/jquery-1.6.4.min.js"></script>
<script src="Scripts/jquery.signalR-2.2.2.js"></script>
<script src="signalr/hubs" type="text/javascript"></script>

<script type="text/javascript">
    $(function () {

        var notificationHub = $.connection.myTestHub;

        $.connection.hub.start(function () {

            notificationHub.activate(function (response) {

                console.log("response", response);
            });
        });
    });
</script>

The hub is created, $.connection.hub.start is fine, but notificationHub.activate returns "Object doesn't support property or method 'activate'". I cannot find the function on notificationHub but I do find it on notificationHub.server. However, calling notificationHub.server.activate does nothing.

I have tried the latest stable version of SingnalR and 2.2.2 (as the sample project) but nothing works. signalr/hibs is OK.

Any ideas? All the examples I have seen basically do this, but I cannot get it to work.

Paul Paul · Accepted Answer · 2019-03-01T12:10:56

Found the answer

                notificationHub.server.activate().done(function (response) {

                    console.log("response", response);
                });

.Net Framework, WebApi and SignalR

1 Answers