这是跟踪：
<Error>
<Message>An error has occurred.</Message>
<ExceptionMessage>
Type 'ProjectName.Web.Api.Controllers.ContinentsController' does not have a default constructor
</ExceptionMessage>
<ExceptionType>System.ArgumentException</ExceptionType>
<StackTrace>
at System.Linq.Expressions.Expression.New(Type type)
at System.Web.Http.Internal.TypeActivator.Create[TBase](Type instanceType)
at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.GetInstanceOrActivator(HttpRequestMessage request, Type controllerType, Func`1& activator)
at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)
</StackTrace>
</Error>
我觉得这很奇怪，因为public class UsersController : ApiController { ... }它工作得很好。我比较了 2 个控制器，所有设置和结构都相似。
我正在使用Ninject并且我的系统设置类似于Jamie Kurtz Asp.Net Mvc 4 和 Web Api: Building a REST Service from Start to Finish。
从堆栈跟踪中，是否有人能够发现问题以及如何解决它？谢谢！
按照要求。
大陆控制器
[LoggingNHibernateSession]
public class ContinentsController : ApiController
{
private readonly ISession _session;
private readonly IContinentMapper _continentMapper;
private readonly IHttpContinentFetcher _httpContinentFetcher;
private readonly IDateTime _dateTime;
public ContinentsController(ISession session, IContinentMapper continentMapper, IHttpContinentFetcher continentFetcher, IDateTime dateTime)
{
_session = session;
_continentMapper = continentMapper;
_httpContinentFetcher = continentFetcher;
_dateTime = dateTime;
}
public IEnumerable<Continent> Get()
{
var continents = _session
.Query<Data.Model.Continent>()
.Select(_continentMapper.CreateContinent)
.ToList();
return continents;
}
public Continent Get(long id)
{
var modelContinent = _httpContinentFetcher.GetContinent(id);
var continent = _continentMapper.CreateContinent(modelContinent);
return continent;
}
}
用户控制器：工作得很好。
public class UsersController : ApiController
{
private readonly ISession _session;
private readonly IUserManager _userManager;
private readonly IUserMapper _userMapper;
private readonly IHttpUserFetcher _userFetcher;
public UsersController(
IUserManager userManager,
IUserMapper userMapper,
IHttpUserFetcher userFetcher,
ISession session)
{
_userManager = userManager;
_userMapper = userMapper;
_userFetcher = userFetcher;
_session = session;
}
[Queryable]
public IQueryable<Data.Model.User> Get()
{
return _session.Query<Data.Model.User>();
}
[LoggingNHibernateSession]
public User Get(Guid id)
{
var user = _userFetcher.GetUser(id);
return _userMapper.CreateUser(user);
}
}
我正在使用NinjectWebCommon.cs它，我有这个和其他一些默认方法。：
private static void RegisterServices(IKernel kernel)
{
var containerConfigurator = new NinjectConfigurator();
containerConfigurator.Configure(kernel);
GlobalConfiguration.Configuration.MessageHandlers.Add(kernel.Get<BasicAuthenticationMessageHandler>());
}
然后我有NinjectConfigurator.cs：
public class NinjectConfigurator
{
......
private void AddBindings(IKernel container)
{
.....
container.Bind<IDateTime>().To<DateTimeAdapter>();
container.Bind<IDatabaseValueParser>().To<DatabaseValueParser>();
//HttpFetchers
container.Bind<IHttpUserFetcher>().To<HttpUserFetcher>();
container.Bind<IHttpContinentFetcher>().To<HttpContinentFetcher>();
//TypeMappers
container.Bind<IUserManager>().To<UserManager>();
container.Bind<IMembershipInfoProvider>().To<MembershipAdapter>();
container.Bind<IUserMapper>().To<UserMapper>();
container.Bind<IContinentMapper>().To<ContinentMapper>();
.........
}
.......
}
两者NinjectWebCommon.cs都NinjectConfigurator.cs位于App_Start文件夹中。
container.Bind<ISession>().ToMethod(CreateSession);是NHibernate。它在NinjectConfigurator.cs里面private void ConfigureNHibernate(IKernel container) { ... }
