C# – OwinStartup and startup in signalr in asp.net mvc

cowinsignalr

i have a problem with SignalR in asp.net mvc
i add a package below:
enter image description here

and add Startup.cs

using Microsoft.Owin;
using Owin;
[assembly: OwinStartup(typeof(Paksh.Startup))]
namespace Paksh
 {
   public class Startup
    {
      public static void ConfigureSignalR(IAppBuilder app)
       {
                  app.MapSignalR();
       }
     }
 }

but i get error:

The following errors occurred while attempting to load the app.
– The OwinStartupAttribute.FriendlyName value '' does not match the given value 'ProductionConfiguration' in Assembly 'Paksh, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
– The given type or method 'ProductionConfiguration' was not found. Try specifying the Assembly.
To disable OWIN startup discovery, add the appSetting owin:AutomaticAppStartup with a value of "false" in your web.config.
To specify the OWIN startup Assembly, Class, or Method, add the appSetting owin:AppStartup with the fully qualified startup class or configuration method name in your web.config.

Best Answer

The error clearly states that

The given [...] method 'ProductionConfiguration' was not found.

This means that the OWIN Startup Class Detection was looking for a method called ProductionConfiguration on the type you provided (Paksh.Startup), but could not find it. Something tells me that you have something similar to this in your web.config as well:

<appSettings>  
  <add key="owin:appStartup" value="ProductionConfiguration" />       
</appSettings>

You have several options to solve this:

Change the name of the ConfigureSignalR method to ProductionConfiguration
Specify the correct method name in the OwinStartupAttribute: [assembly: OwinStartup(typeof(Paksh.Startup), "ConfigureSignalR")]

To get to know the OWIN startup class detection, read more here.

This is the style that Microsoft tends to use in their examples.

It appears that the guidance in this area may have changed, as StyleCop now enforces the use of the C# specific aliases.

C# – OWIN Startup Class Missing

Create One Class With Name Startup this will help you..

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

Best Answer

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This is the style that Microsoft tends to use in their examples.

C# – OWIN Startup Class Missing

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