asp.net web api2 - How to inject UrlHelper in Web API 2 using StructureMap.WebApi2 nuget package -

i using structuremap.webapi2 nuget package web api 2 project managing depedency injection. web api controllers use constructor injection inject urlhelper dependency should resolved structuremap ioc. trying following approach set urlhelper web api controller:

public class foocontroller : apicontroller {     private urlhelper _urlhelper;      public modelfactory(httprequestmessage request)         {             _urlhelper = new urlhelper(request);             } } 

but above code getting following error:

no default instance registered , cannot automatically determined type 'system.net.http.httpmethod' there no configuration specified system.net.http.httpmethod

can suggest me best possible ways resolve above issue?

your problem structuremap tries resolve greediest constructor first, in instance taking @ source code httprequestmessage reveals following constructors:

public httprequestmessage(httpmethod method, string requesturi); public httprequestmessage(httpmethod method, uri requesturi); 

this httpmethod issue coming from. structuremap tries create instance of httprequestmessage has no idea how resolve method , requesturi dependencies.

in instance need manually configure dependency within structuremap configuration knows how create instance of httprequestmessage so:

this.for<httprequestmessage>().use(new httprequestmessage());

alternatively, create instances of overloaded constructors you'll need manually resolve overloaded dependencies (i recommend using factory in order keep sm configuration nice , clean. here example of how can this).