如何定义一个有效的OWIN Startup Class

1. 命名约定

   Katana在程序集内的程序集名称空间下查找一个叫做Startup的类，

2. 通过属性指定

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

3. 通过配置文件

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

定义友好命名的Startup类

<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