How to use signalr v2 beta in asp.net mvc 4

问题

Before v2:

RouteTable.Routes.MapHubs();

In v2, MapHubs does not exist anymore. The wiki says to add a Startup class and a Configuration method and a call to app.MapHubs().

namespace MyAssembly 
{
public class Startup
{
    public void Configuration(IAppBuilder app)
    {
        //Before v2
        //RouteTable.Routes.MapHubs();

        app.MapHubs();
    }
}
}

But the method is never called, no error occurs, and ... no hub are setup.

I suppose there is some code to add to global.asax.cs

What is the secret ?

回答1:

Try defining [assembly : OwinStartup(typeof(MyAssembly.Startup))] to see if your Startup class is being picked up.

回答2:

EDIT: removed lines not relevant.

Solution !

<appSettings>
    <add key="owin:AppStartup" value="MyNameSpace.Startup, MyNameSpace" />
</appSettings>

plus update both MVC4 (not to prerelease, but to latest stable version) and SignalR/owin nugets.

plus fix bugs in js client :

if disconnectTimeout=999000 then it is disabled. Must be set server-side with: GlobalHost.Configuration.DisconnectTimeout = TimeSpan.FromSeconds(999); note: server side can not set a value < 6 (signalr throws an exception if DisconnectTimeout < 6). So use this magic number.
webSockets: set connection.socket = null in sockettransport, otherwise the call to start fails after a (manual) call to stop
serverSentEvents: prevent error caused by a reconnection attempt when the window is unloading
chrome fails with exception if signalr hub url not available (temporarily) : Instead of giving up try the next available protocol / try to reconnect.

回答3:

I was able to get the 2.0 beta working by

Removing all references to the older version of SignalR, ie nuget uninstall of the library and double checking /bin
Installed SignalR 2.0.0-beta2 via Package Manager Console Install-Package Microsoft.AspNet.SignalR -Pre
Following the steps in the 1.x to 2.0 migration outlined here
And most importantly changing the project config to use Local IIS Web server instead of Visual Studio Developer Server (Cassini).

More info in the question/answer I posted here

回答4:

In web.config there must be a fully qualified name of the class, e.g.

<appSettings>
    <add key="owin:AppStartup" value="**My.Name.Space.Startup**, **AssemblyName**" />
</appSettings>

I had a problem when I put namespace instead of assembly name, but with the fully qualified name it works without any other changes to web.config!

UPDATE: I also followed the steps from the link: http://www.asp.net/vnext/overview/latest/release-notes#TOC13, i.e. removed a NuGet package "Microsoft.AspNet.SignalR.Owin"

来源：https://stackoverflow.com/questions/17862446/how-to-use-signalr-v2-beta-in-asp-net-mvc-4

标签

asp.net-mvc-4

signalr

owin