'Owin.IAppBuilder' does not contain a definition for 'MapSignalR'

Question

Error

'Owin.IAppBuilder' does not contain a definition for 'MapSignalR' and no extension method 'MapSignalR' accepting a first argument of type 'Owin.IAppBuilder' could be found (are you missing a using directive or an assembly reference?)

Code

using Microsoft.Owin;
using Owin;

[assembly: OwinStartup(typeof(SignalRChat.Startup))]
namespace SignalRChat
{
    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            // Any connection or hub wire up and configuration should go here
            app.MapSignalR();
        }
    }
}  

Any help would be greatly appreciated...

Update

signalR version 2.0.3
Microsoft Owin version 2.0.2
Owin version 1.0.0
Visual Studio 2012

Cathodoluminescence

Answer 1

Only install this nuget:

Install-Package Microsoft.AspNet.WebApi.OwinSelfHost

Horizontal

Need to install this nuget too: Install-Package Microsoft.Owin.Cors -Version 3.1.0 – Strikebound

Answer 2

Finally was able to solve it by adding signalR dependencies before adding signalR from NuGet Packages
Step's I followed:

1. Added Microsoft.Owin //version 2.0.1
2. Added Microsoft.Owin.Security //version 2.0.1
3. Added Microsoft Asp.Net SignalR

The reason I discovered was a problem with version 2.0.2 of Microsoft.Owin and Microsoft.Owin.Security and then adding a class named Startup.cs with following code:

using Microsoft.Owin;
using Owin;

[assembly: OwinStartup(typeof(webApp.Startup))]
namespace webApp
{
    public static class Startup
    {
        public static void Configuration(IAppBuilder app)
        {
            app.MapSignalR();
        }
    }
}  

Directly adding Microsoft Asp.Net SignalR from NuGet adds version 2.0.2 of Microsoft.Owin and Microsoft.Owin.Security which creates the problem.
Hope it helps someone...!!

Cathodoluminescence

Thanks! You saved me from getting very frustrated on a Friday night! – Again

FYI as of 2/15/2015 this seems to have been resolved. I only installed Microsoft.AspNet.SignalR directly and the above worked fine. – Brotherhood

This is an old solution. Do refer the answer by @Horizontal for the latest answer. – Cathodoluminescence

Thank you so much my friend... your solution solved my problem which I was working for 1 hours... – Broyles

Answer 3

Update-Package Owin -Reinstall

worked for me

Rodrigo

Worked for me too thank you. I tried the other solutions above and they did not work. This one did. – Smoodge

Answer 4

Install Nuget Package: Microsoft.AspNet.Identity.Owin

Choli

Answer 5

I had this same problem. Turns out my .csproj file the first line:

Project ToolsVersion="12.0" didn't match my other files. Changed it to:

Project ToolsVersion="14.0"

and no more compile issue.

Hydrated

Answer 6

Using MVC5, enter your Startup.cs file.

Add IAppBuilder appBuilder to Configure():

 public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory, IAppBuilder appBuilder)
    {

Then, under

app.UseMvc(routes =>
{
    routes.MapRoute(
        name: "default",
        template: "{controller=Home}/{action=Index}/{id?}");
});

add appBuilder.MapSignalR();

Gentian

Answer 7

Asp.Net 5 empty mvc project out of the box creates something that looks like this

 using Microsoft.Owin;
using Owin;
namespace DeadlyChat
{
public class Startup
{
    // For more information on how to configure your application, visit http://go.microsoft.com/fwlink/?LinkID=398940
    public void ConfigureServices(IServiceCollection services)
    {
    }

    public void Configure(IApplicationBuilder app)
    {
        app.MapSignalR();



       }
    }
}

Took me a while to notice that Configure was supposed to be Configuration and IApplicationBuilder needs to be IAppBuilder. I also pulled off the assembly annotation above the namespace.

I wound up scrapping trying to use Asp.Net 5 couldn't get it to work. Went back to 4.6 and everything worked fine. Followed this walkthrough http://www.asp.net/signalr/overview/getting-started/tutorial-getting-started-with-signalr

Thermoscope