Question

我正在使用OWIN开发ASP.NET WebAPI。为了管理DBContext（实体框架）的实例，我尝试使用Ninject。但是，当我调用控制器时，程序返回错误：

无法创建控制器，缺少构造函数。

你能告诉我这里出了什么问题吗？我的控制器类：

public class Testcontroller
{
    private IApplicationDbContext _context;

    public Testcontroller(IApplicationDbContext context)
    {
        _context = context;
    }
}

这是Ninject-File：

public static class NinjectWebCommon 
{
    private static readonly Bootstrapper bootstrapper = new Bootstrapper();

    public static void Start() 
    {
        DynamicModuleUtility.RegisterModule(typeof(OnePerRequestHttpModule));
        DynamicModuleUtility.RegisterModule(typeof(NinjectHttpModule));
        bootstrapper.Initialize(CreateKernel);
    }

    public static void Stop()
    {
        bootstrapper.ShutDown();
    }

    private static IKernel CreateKernel()
    {
        var kernel = new StandardKernel();
        try
        {
            kernel.Bind<Func<IKernel>>().ToMethod(ctx => () => new Bootstrapper().Kernel);
            kernel.Bind<IHttpModule>().To<HttpApplicationInitializationHttpModule>();
            kernel.Bind<IApplicationDbContext>().To<ApplicationDbContext>();
            GlobalConfiguration.Configuration.DependencyResolver = new NinjectDependencyResolver(kernel);
            RegisterServices(kernel);
            return kernel;
        }
        catch
        {
            kernel.Dispose();
            throw;
        }
    }

    private static void RegisterServices(IKernel kernel)
    {
    }        
}

Ninject依赖范围：

public class NinjectDependencyScope : IDependencyScope
{
    IResolutionRoot resolver;

    public NinjectDependencyScope(IResolutionRoot resolver)
    {
        this.resolver = resolver;
    }

    public object GetService(Type serviceType)
    {
        if (resolver == null)
            throw new ObjectDisposedException("this", "This scope has been disposed");

        return resolver.TryGet(serviceType);
    }

    public System.Collections.Generic.IEnumerable<object> GetServices(Type serviceType)
    {
        if (resolver == null)
            throw new ObjectDisposedException("this", "This scope has been disposed");

        return resolver.GetAll(serviceType);
    }

    public void Dispose()
    {
        IDisposable disposable = resolver as IDisposable;
        if (disposable != null)
            disposable.Dispose();

        resolver = null;
    }
}

// This class is the resolver, but it is also the global scope
// so we derive from NinjectScope.
public class NinjectDependencyResolver : NinjectDependencyScope, IDependencyResolver
{
    IKernel kernel;

    public NinjectDependencyResolver(IKernel kernel) : base(kernel)
    {
        this.kernel = kernel;
    }

    public IDependencyScope BeginScope()
    {
        return new NinjectDependencyScope(kernel.BeginBlock());
    }
}

实体框架DbContext-Class：

 public class ApplicationDbContext : IdentityDbContext<ApplicationUser>, IApplicationDbContext
{
    public ApplicationDbContext()
        : base("DefaultConnection", throwIfV1Schema: false)
    {
        Configuration.ProxyCreationEnabled = false;
        Configuration.LazyLoadingEnabled = false;
    }

    public virtual DbSet<Models.Team> Teams { get; set; }

    public static ApplicationDbContext Create()
    {
        return new ApplicationDbContext();
    }
}

public interface IApplicationDbContext
{
    DbSet<Models.Team> Teams { get; set; }

    int SaveChanges();
    Task<int> SaveChangesAsync(CancellationToken cancellationToken);
}

我尝试按照本教程：http://www.peterprovost.org/blog/2012/06/19/adding-ninject-to-web-api

我在这里做错了什么？提前谢谢！

Answer 1

除非您的控制器代码中存在严重遗漏，否则您的控制器不会继承colnames <- c("user.name", "user.password", "business", "misc") for(name in colnames) { access <- mydata[,name] doSomething(access) }，正如Web Api所期望的那样

ApiController

Answer 2

更新

我尝试使用以下方法从头开始设置所有内容：http://www.alexzaitzev.pro/2014/11/webapi2-owin-and-ninject.html

出于某种原因，它现在完美无缺。感谢您的支持！

依赖注入的麻烦

2 个答案: