Migrate Global.asax to Startup.cs

Question

For better test job with Microsoft.Owin.Testing.TestServer, I found that Global.asax is not loaded with Owin TestServer.

So, I try to move my Global.asax configurations to Startup.cs as below,

public partial class Startup {     public void Configuration(IAppBuilder app)     {         // pasted Global.asax things start.         GlobalConfiguration.Configuration.Formatters.Clear();          var jsonSerializerSettings = new JsonSerializerSettings         {             PreserveReferencesHandling = PreserveReferencesHandling.Objects,             ReferenceLoopHandling = ReferenceLoopHandling.Ignore,         };         GlobalConfiguration.Configuration.Formatters.Add(new JsonMediaTypeFormatter() { SerializerSettings = jsonSerializerSettings });         GlobalConfiguration.Configuration.Formatters.Add(new FormMultipartEncodedMediaTypeFormatter());          AreaRegistration.RegisterAllAreas();         GlobalConfiguration.Configure(WebApiConfig.Register);         FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);         RouteConfig.RegisterRoutes(RouteTable.Routes);         BundleConfig.RegisterBundles(BundleTable.Bundles);         // pasted Global.asax things end.          ConfigureAuth(app);     } } 

But TestServer failed to initialize in every point of configuration such as AreaRegistration.RegisterAllAreas, FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters), so on...

Minimum viable migration(successful test with TestServer) for me is as below.

public partial class Startup {     public void Configuration(IAppBuilder app)     {         var config = new HttpConfiguration();         config.Formatters.Clear();          var jsonSerializerSettings = new JsonSerializerSettings         {             PreserveReferencesHandling = PreserveReferencesHandling.Objects,             ReferenceLoopHandling = ReferenceLoopHandling.Ignore,         };         config.Formatters.Add(new JsonMediaTypeFormatter() { SerializerSettings = jsonSerializerSettings });         config.Formatters.Add(new FormMultipartEncodedMediaTypeFormatter());          WebApiConfig.Register(config); // moved from GlobalConfiguration.Configure(WebApiConfig.Register)         app.UseWebApi(config);         ConfigureAuth(app);     } } 

Is there anyway to move all configurations to Startup.cs?

Answer 1

As you are already aware, OwinContext consumed by Startup.Configuration() is different from the traditional ASP.NET HttpContext consumed by MvcApplication.Application_Start(). Both are using different context pipelines. More specifically, ASP.NET MVC still relies on System.Web.dll while ASP.NET Web API doesn't.

Therefore, based on your code, some methods usually laid in MvcApplication.Application_Start() can't be run within Startup.Configuration():

• AreaRegistration.RegisterAllAreas();: This method relies on System.Web.dll.
• RouteConfig.RegisterRoutes(RouteTable.Routes);: RouteCollection is a part of System.Web.dll.
• GlobalConfiguration.Configure(WebApiConfig.Register): Again, RouteCollection within WebApiConfig.Register() is a part of System.Web.dll.

For URL routing within OWIN context, AttributeRouting is recommended. So, instead of this, try config.MapHttpAttributeRoutes(); That will give you much freedom.

If you still want to run AreaRegistration.RegisterAllAreas(); within OWIN context, Startup.Configuration(), I'd better recommend to import Katana library. This integrates OWIN with System.Web.dll so that you probably archieve your goal.

HTH