Web API routing in Sitecore 8.2 - asp.net-web-api

Question

I migrated a sitecore 7.2 application to sitecore 8.2 using the express migration tool. After the migration Web API routing stopped working. I'm using below given method to map the routing
[UsedImplicitly]
public class ConfigRegister
{
/// <summary>
/// Startup method to bind all configurations for site core pipeline.
/// </summary>
/// <param name="args"></param>
public virtual void Process(PipelineArgs args)
{ RouteConfig.RegisterRoutes(RouteTable.Routes);
}
}
Then registering it using following code snippet
public static void Register(HttpConfiguration config)
{
config.MapHttpAttributeRoutes();
config.Routes.MapHttpRoute(
name: "ControllersApi",
routeTemplate: "WebApi/CustomerPortal/{controller}/{action}/{id}",
defaults: new { id = RouteParameter.Optional }
);
}
I'm getting error A route named 'MS_attributerouteWebApi' is already in the route collection. Route names must be unique.
Parameter name: name.
But when I comment the line
config.MapHttpAttributeRoutes();
I'm getting error
{"Message":"An error has occurred.","ExceptionMessage":"The object has not yet been initialized. Ensure that HttpConfiguration.EnsureInitialized() is called in the application's startup code after all other initialization code.","ExceptionType":"System.InvalidOperationException","StackTrace":" at System.Web.Http.Routing.RouteCollectionRoute.get_SubRoutes()\r\n at System.Web.Http.Routing.RouteCollectionRoute.GetRouteData(String virtualPathRoot, HttpRequestMessage request)\r\n at System.Web.Http.WebHost.Routing.HttpWebRoute.GetRouteData(HttpContextBase httpContext)"}
Your help to solve this issue is highly appreciated

Answer 1

I assume you have this under the initialize pipeline, correct?
This is what we've done before and works on 8.2:
public void Process(PipelineArgs args)
{
HttpConfiguration httpConfig = GlobalConfiguration.Configuration;
httpConfig.Routes.MapHttpSessionRoute("WebApiRoute", "webapi/{controller}/{action}/{id}", true, new { id = RouteParameter.Optional });
}
If the above doesn't work,try this (per Habitat):
public void Process(PipelineArgs args)
{
RouteTable.Routes.MapHttpRoute("Feature.Demo.Api", "api/demo/{action}", new
{
controller = "Demo"
});
}