Asp.net web api 结构映射无参数构造函数错误

我正在尝试使用Web API 2设置结构映射3.0.5.0版

我遵循了这一实施：

但是，在对ComplexesController执行get时，我遇到了以下错误：

尝试创建“ComplexesController”类型的控制器时出错。确保控制器具有无参数公共构造函数

有人能看到我的structuremap配置有什么问题吗？Create方法从未被调用

这是我的实现：

public class StructureMapControllerActivator : IHttpControllerActivator
{
    private readonly IContainer _container;

    public StructureMapControllerActivator(IContainer container)
    {
        if (container == null) throw new ArgumentNullException("container");
        _container = container;
    }

    public IHttpController Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)
    {
        try
        {                
            var scopedContainer = _container.GetNestedContainer();
            scopedContainer.Inject(typeof(HttpRequestMessage), request);
            request.RegisterForDispose(scopedContainer);
            return (IHttpController)scopedContainer.GetInstance(controllerType);
        }
        catch (Exception e)
        {
            // TODO : Logging
            throw e;
        }
    }
}

此方法在我的启动中

public void InitializeContainer()
    {
        // STRUCTURE MAP
        Container container = new Container();
        GlobalConfiguration.Configuration.Services.Replace(typeof(IHttpControllerActivator), new StructureMapControllerActivator(container));

        container.Configure(x => x.For<IForumRepository>().Use<ForumRepository>());
        container.Configure(x => x.For<IComplexRepository>().Use<ComplexRepository>());        
    }

---

这里的问题是，您正在向GlobalConfiguration对象而不是HttpConfiguration对象注册service activator。在这种情况下，永远不会使用GlobalConfiguration对象，因为它被HttpConfiguration对象替换。为了解决您的问题，您应该用以下方法替换InitializeContainer（）方法

public void InitializeContainer(HttpConfiguration config)
    {
        // STRUCTURE MAP
        Container container = new Container();
        config.Services.Replace(typeof(IHttpControllerActivator), new StructureMapControllerActivator(container));

        container.Configure(x => x.For<IForumRepository>().Use<ForumRepository>());
        container.Configure(x => x.For<IComplexRepository>().Use<ComplexRepository>());        
    }

public void InitializeContainer（HttpConfiguration配置）
    {
//结构图
容器=新容器（）；
config.Services.Replace（typeof（IHttpControllerActivator），新结构MapControllerActivator（container））；
Configure（x=>x.For（）.Use（））；
Configure（x=>x.For（）.Use（））
    }

然后，应该将HttpConfiguration对象从启动类传递到新的InitializeContainer（）方法

希望这有帮助

---

-B

我试图对整个生命周期有一个坚实的理解。我想我的设置可能与上面的略有不同。这是对我有用的东西

public partial class Startup
{
    public void Configuration(IAppBuilder app)
    {                       
        var config = new HttpConfiguration();
        var container = IocConfig.Setup();

        // Allow a controller to be declared without a parameterless constructor
        config.DependencyResolver = new DependencyResolver(container);

        config.Services.Add( typeof(IExceptionLogger), new GlobalExceptionLogger( container.GetInstance<ILoggingService>()));

        // Web API routes
        config.MapHttpAttributeRoutes();

        // Setup Authentication
        ConfigureOAuth(app, container);

        var corsOptions = CorsOptions.AllowAll;

        app.UseCors(corsOptions);

        // Add ASP.Net Web API to OWIN pipeline
        app.UseWebApi(config);
    }
}

您必须使用静态设置方法从名为IocConfig的静态类加载我的var容器。这是接口映射到其具体实现的地方

---

另外，如果您想使用我的完整示例，您可能可以忽略GlobalExceptionLogger行。

谢谢Brendan-准确定位刚刚测试-正在调用Create并从控制器返回数据-sweet

public void InitializeContainer(HttpConfiguration config)
    {
        // STRUCTURE MAP
        Container container = new Container();
        config.Services.Replace(typeof(IHttpControllerActivator), new StructureMapControllerActivator(container));

        container.Configure(x => x.For<IForumRepository>().Use<ForumRepository>());
        container.Configure(x => x.For<IComplexRepository>().Use<ComplexRepository>());        
    }

public partial class Startup
{
    public void Configuration(IAppBuilder app)
    {                       
        var config = new HttpConfiguration();
        var container = IocConfig.Setup();

        // Allow a controller to be declared without a parameterless constructor
        config.DependencyResolver = new DependencyResolver(container);

        config.Services.Add( typeof(IExceptionLogger), new GlobalExceptionLogger( container.GetInstance<ILoggingService>()));

        // Web API routes
        config.MapHttpAttributeRoutes();

        // Setup Authentication
        ConfigureOAuth(app, container);

        var corsOptions = CorsOptions.AllowAll;

        app.UseCors(corsOptions);

        // Add ASP.Net Web API to OWIN pipeline
        app.UseWebApi(config);
    }
}

// Allow a controller to be declared without a parameterless constructor
config.DependencyResolver = new DependencyResolver(container);