c# - Web API, Unity and Parameterless Constructor -


i have web api solution , want inject class constructor of controller.

i using unity:

webapiconfig.cs

public static class webapiconfig {     public static void register(httpconfiguration config)     {         var container = new unitycontainer();         container.registertype<idatabaseadapter, databaseadapter>(new hierarchicallifetimemanager());         config.dependencyresolver = new unityresolver(container);          config.suppressdefaulthostauthentication();         config.filters.add(new hostauthenticationfilter(oauthdefaults.authenticationtype));         var constraintresolver = new defaultinlineconstraintresolver                                  {                                      constraintmap =                                      {                                          ["apiversion"] = typeof(apiversionrouteconstraint)                                      }                                  };         config.maphttpattributeroutes(constraintresolver);         config.addapiversioning();         config.routes.maphttproute(             name: "defaultapi",             routetemplate: "api/{controller}/{id}",             defaults: new { id = routeparameter.optional }         );     } }

unityresolver

public class unityresolver : idependencyresolver {     protected iunitycontainer _container;      public unityresolver(iunitycontainer container)     {         _container = container ?? throw new argumentnullexception("container");     }      public object getservice(type servicetype)     {         try         {             return _container.resolve(servicetype);         }         catch (resolutionfailedexception)         {             return null;         }     }      public ienumerable<object> getservices(type servicetype)     {         try         {             return _container.resolveall(servicetype);         }         catch (resolutionfailedexception)         {             return new list<object>();         }     }      public idependencyscope beginscope()     {         var child = _container.createchildcontainer();         return new unityresolver(child);     }      public void dispose()     {         dispose(true);     }      protected virtual void dispose(bool disposing)     {         _container.dispose();     } }

my controller.

[system.web.http.routeprefix("api/v{version:apiversion}/measurements")] [apiversion("1.0")] public class measurementscontroller : controller {     private readonly idatabaseadapter _databaseadapter;     [injectionconstructor]     public measurementscontroller(idatabaseadapter databaseadapter)     {         _databaseadapter = databaseadapter;     }     [maptoapiversion("1.0")]     [system.web.http.route("gettrafficlights")]     public jsonresult gettrafficlights()     {         var trafficlights = trafficlightcache.trafficlightcache.trafficlights();         var result = new jsonresult         {             data = jsonconvert.serializeobject(trafficlights),             jsonrequestbehavior = jsonrequestbehavior.allowget         };         return result;     }     [maptoapiversion("1.0")]     [system.web.http.route("updatemeasurement")]     public async task<httpstatuscoderesult> update(string measurementtoupdate)     {         var measurement = jsonconvert.deserializeobject<measurement>(measurementtoupdate, new jsonserializersettings         {             datetimezonehandling = datetimezonehandling.utc         });         await _databaseadapter.update(measurement);         return new httpstatuscoderesult(httpstatuscode.accepted);     } }

databaseadapter

public class databaseadapter : idatabaseadapter {    public async task<dictionary<int, cacheentry>> measurementcache()    { ... }     public async task update(measurement measurement)    { ... } }

idatabaseadapter

public interface idatabaseadapter {     task<dictionary<int, trafficlightcache.cacheentry>> measurementcache();     task update(measurement measurement); }

the error says no parameterless constructor found. if add empty parameterless constructor never fires constructor includes idatabaseadapter injection calls update result in _databaseadapter being null.

the stack trace is

[missingmethodexception: no parameterless constructor defined object.]    system.runtimetypehandle.createinstance(runtimetype type, boolean publiconly, boolean nocheck, boolean& canbecached, runtimemethodhandleinternal& ctor, boolean& bneedsecuritycheck) +0    system.runtimetype.createinstanceslow(boolean publiconly, boolean skipcheckthis, boolean fillcache, stackcrawlmark& stackmark) +119    system.runtimetype.createinstancedefaultctor(boolean publiconly, boolean skipcheckthis, boolean fillcache, stackcrawlmark& stackmark) +247    system.activator.createinstance(type type, boolean nonpublic) +83    system.activator.createinstance(type type) +11    system.web.mvc.defaultcontrolleractivator.create(requestcontext requestcontext, type controllertype) +55  [invalidoperationexception: error occurred when trying create controller of type 'apitest2.controllers.v1.measurementscontroller'. make sure controller has parameterless public constructor.]    system.web.mvc.defaultcontrolleractivator.create(requestcontext requestcontext, type controllertype) +178    system.web.mvc.defaultcontrollerfactory.getcontrollerinstance(requestcontext requestcontext, type controllertype) +76    system.web.mvc.defaultcontrollerfactory.createcontroller(requestcontext requestcontext, string controllername) +88    system.web.mvc.mvchandler.processrequestinit(httpcontextbase httpcontext, icontroller& controller, icontrollerfactory& factory) +194    system.web.mvc.mvchandler.beginprocessrequest(httpcontextbase httpcontext, asynccallback callback, object state) +50    system.web.mvc.mvchandler.beginprocessrequest(httpcontext httpcontext, asynccallback callback, object state) +48    system.web.mvc.mvchandler.system.web.ihttpasynchandler.beginprocessrequest(httpcontext context, asynccallback cb, object extradata) +16    system.web.callhandlerexecutionstep.system.web.httpapplication.iexecutionstep.execute() +103    system.web.httpapplication.executestep(iexecutionstep step, boolean& completedsynchronously) +155

you need user apicontroller. not controller.


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