I am new by signalR and Owin and need help.
I wrote all my signalR code in a library [My hub will be self hosted]. Then i referenced that lib from a windows service application, installed the Package "Microsoft.Owin.Host.HttpListener" in the windows service application and tried to execute it. I am getting that wired exception:
Sequence contains no matching element
I tested my Library in a winForm application and it worked correctly.
I have no idea why i am getting that.
Update: Code example: In My Library "myLib"
private IDisposable host;
private bool Start()
{
try
{
string url = "http://localhost:5000/";
host = SelfHost.Host(url);
}
catch (Exception ex)
{
log.WriteLine("************HOSTING FAILED ********************************* ex.ToString():"+ ex.ToString()+
" Ex.StackTrace: "+ex.StackTrace +" EX.Message: " + ex.Message + "***************");
}
}
private bool Stop()
{
if (host != null)
{
host.Dispose();
}
}
My SelfHost class:
class SelfHost
{
public static IDisposable Host(string url)
{
return WebApplication.Start<SelfHost>(url);
}
public void Configuration(IAppBuilder app)
{
// Turn cross domain on
var config = new HubConfiguration { EnableCrossDomain = true };
// This will map out to http://localhost:8080/signalr by default
app.MapHubs(config);
}
}
after creating an object from this lib in my windows service application:
myLib l = new myLib();
i implements the OnStart() of the windows Service which starts a thread that calls the Start()-function from myLib:
protected override void OnStart(string[] args)
{
Thread t = new Thread(new ThreadStart(this.StartServiceThread));
t.CurrentCulture = new System.Globalization.CultureInfo("en-US");
t.Start();
}
private void StartServiceThread()
{
l.Start();
}
Output [Ex-Details]
************HOSTING FAILED *********************************
ex.ToString():
System.InvalidOperationException: Sequence contains no matching element
at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source, Func`2 predicate)
at Microsoft.Owin.Hosting.ServerFactory.DefaultServerFactoryLoader.Load(String serverName)
at Microsoft.Owin.Hosting.KatanaEngine.ResolveServerFactory(StartContext context)
at Microsoft.Owin.Hosting.KatanaEngine.Start(StartContext context)
at Microsoft.Owin.Hosting.Starter.DirectHostingStarter.Start(StartOptions options)
at Microsoft.Owin.Hosting.KatanaStarter.Start(StartOptions options)
at Microsoft.Owin.Hosting.WebApplication.Start[TStartup](IServiceProvider services, StartOptions options)
at Microsoft.Owin.Hosting.WebApplication.Start[TStartup](StartOptions options)
at Microsoft.Owin.Hosting.WebApplication.Start[TStartup](String url)
at SelfHost.Host(String url) in SelfHost.cs:line 29
at myLib.Start() in myLib.cs:line 381
Ex.StackTrace:
at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source, Func`2 predicate)
at Microsoft.Owin.Hosting.ServerFactory.DefaultServerFactoryLoader.Load(String serverName)
at Microsoft.Owin.Hosting.KatanaEngine.ResolveServerFactory(StartContext context)
at Microsoft.Owin.Hosting.KatanaEngine.Start(StartContext context)
at Microsoft.Owin.Hosting.Starter.DirectHostingStarter.Start(StartOptions options)
at Microsoft.Owin.Hosting.KatanaStarter.Start(StartOptions options)
at Microsoft.Owin.Hosting.WebApplication.Start[TStartup](IServiceProvider services, StartOptions options)
at Microsoft.Owin.Hosting.WebApplication.Start[TStartup](StartOptions options)
at Microsoft.Owin.Hosting.WebApplication.Start[TStartup](String url)
at SelfHost.Host(String url) in SelfHost.cs:line 29
at myLib.Start() in myLib.cs:line 381
EX.Message: Sequence contains no matching element***************
Thanks in Advance!