在我设置问题之前你应该知道我从这个页面得到了我当前的代码: http://www.strathweb.com/2012/05/using-ninject-with-the-latest-asp-net-web-api-source/

我正在尝试通过在上述站点上找到的 IDependencyResolver 适配器在我的应用程序中使用 ASP.NET Web API 和 Ninject。

我创建了所有代码，就像它在网站上显示的那样并且可以正常工作，但是当我加载我的应用程序时，我的常规 Controller 失败并显示此错误:

[MissingMethodException: 没有为此对象定义无参数构造函数。]
[InvalidOperationException:尝试创建“AccountManager.Controllers.HomeController”类型的 Controller 时发生错误...

因此，看起来我可以将 Ninject 与常规 Controller 或 Web API Controller 一起使用，但不能同时与两者一起使用。 :(

这是我的代码:

NinjectResolver.cs

public class NinjectResolver : NinjectScope, IDependencyResolver
{
    private IKernel _kernel;

    public NinjectResolver(IKernel kernel)
        : base(kernel)
    {
        _kernel = kernel;
    }

    public IDependencyScope BeginScope()
    {
        return new NinjectScope(_kernel.BeginBlock());
    }
}

NinjectScope.cs

public class NinjectScope : IDependencyScope
{
    protected IResolutionRoot resolutionRoot;

    public NinjectScope(IResolutionRoot kernel)
    {
        resolutionRoot = kernel;
    }

    public object GetService(Type serviceType)
    {
        IRequest request = resolutionRoot.CreateRequest(serviceType, null, new Parameter[0], true, true);
        return resolutionRoot.Resolve(request).SingleOrDefault();
    }

    public IEnumerable<object> GetServices(Type serviceType)
    {
        IRequest request = resolutionRoot.CreateRequest(serviceType, null, new Parameter[0], true, true);
        return resolutionRoot.Resolve(request).ToList();
    }

    public void Dispose()
    {
        IDisposable disposable = (IDisposable)resolutionRoot;
        if (disposable != null) disposable.Dispose();
        resolutionRoot = null;
    }
}

Global.asax.cs

public class MvcApplication : System.Web.HttpApplication
{
    private void SetupDependencyInjection()
    {
        //create Ninject DI Kernel
        IKernel kernel = new StandardKernel();

        //register services with Ninject DI container
        RegisterServices(kernel);

        //tell asp.net mvc to use our Ninject DI Container
        GlobalConfiguration.Configuration.DependencyResolver = new NinjectResolver(kernel);
    }
}

AccountingController.cs

public class AccountingController : ApiController
{
    private ICustomerService _customerService;

    public AccountingController(ICustomerService service)
    {
        _customerService = service;
    }

    // GET /api/<controller>/5
    public string Get(int id)
    {
        return "value";
    }
}

最佳答案

在调用 RegisterServices(kernel); 之前，将以下代码行插入到 CreateKernel() 方法中。

GlobalConfiguration.Configuration.DependencyResolver = new NinjectResolver(kernel);

您还需要使用下面的代码，我更喜欢将它定义在同一个类中。

public class NinjectResolver : NinjectScope, IDependencyResolver
{
    private IKernel _kernel;
    public NinjectResolver(IKernel kernel)  : base(kernel)
    {
        _kernel = kernel;
    }
    public IDependencyScope BeginScope()
    {
        return new NinjectScope(_kernel.BeginBlock());
    }
}

public class NinjectScope : IDependencyScope
{
    protected IResolutionRoot resolutionRoot;
    public NinjectScope(IResolutionRoot kernel)
    {
        resolutionRoot = kernel;
    }
    public object GetService(Type serviceType)
    {
        IRequest request = resolutionRoot.CreateRequest(serviceType, null, new Parameter[0], true, true);
        return resolutionRoot.Resolve(request).SingleOrDefault();
    }
    public IEnumerable<object> GetServices(Type serviceType)
    {
        IRequest request = resolutionRoot.CreateRequest(serviceType, null, new Parameter[0], true, true);
        return resolutionRoot.Resolve(request).ToList();
    }
    public void Dispose()
    {
        IDisposable disposable = (IDisposable)resolutionRoot;
        if (disposable != null) disposable.Dispose();
        resolutionRoot = null;
    }
}

运行它，它应该可以工作。这对我有用，我希望对你也有用。

进一步阅读:

Using Ninject – Dependency Injection with ASP.NET Web API controllers

关于c# - Ninject 和 ASP.NET Web API，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11652862/