如何定義一個有效的OWIN Startup Class

1. 命名約定
   

   Katana在程式集內的程式集名稱空間下查找一個叫做Startup的類，

2. 通過屬性指定

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

3. 通過配置文件

<add key="owin:appStartup" value="OwinConsoleApp.Startup1" />

 定義友好命名的Startup類

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

[assembly: OwinStartup("ProductionConfiguration", typeof(StartupDemo.ProductionStartup2))]

namespace StartupDemo
{
    public class ProductionStartup
    {
        public void Configuration(IAppBuilder app)
        {
            app.Run(context =>
            {
                string t = DateTime.Now.Millisecond.ToString();
                return context.Response.WriteAsync(t + " Production OWIN App");
            });
        }
    }
    public class ProductionStartup2
    {
        public void Configuration(IAppBuilder app)
        {
            app.Run(context =>
            {
                string t = DateTime.Now.Millisecond.ToString();
                return context.Response.WriteAsync(t + " 2nd Production OWIN App");
            });
        }
    }
}

https://docs.microsoft.com/en-us/aspnet/aspnet/overview/owin-and-katana/owin-startup-class-detection