c# - 无参数 Controller 的 Ninject WebApi 错误

Question

我已经阅读了我能找到的所有 Stack Overflow 问题，但无济于事。当我通过 NuGet 安装 Ninject 包时，没有安装 NinjectWebCommon.cs 类，所以我自己编写了代码(如下)。我安装了 Ninject、Ninject.WebCommon、Ninject.Webcommon.Webhost、Ninject.WebApi、Ninject.WebApi.DependencyResolver。但是，我在我的 Controller 中收到一条众所周知的消息，即我必须有一个无参数 Controller ，当然我不想要它，因为我需要 DI。

这是我创建的 Ninject 类:

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


    /// <summary> 
    /// Starts the application 
    /// </summary> 
    public static void Start()
    {
        DynamicModuleUtility.RegisterModule(typeof(OnePerRequestHttpModule));
        DynamicModuleUtility.RegisterModule(typeof(NinjectHttpModule));
        bootstrapper.Initialize(CreateKernel);
    }

    /// <summary> 
    /// Stops the application. 
    /// </summary> 
    public static void Stop()
    {
        bootstrapper.ShutDown();
    }

    /// <summary> 
    /// Creates the kernel that will manage your application. 
    /// </summary> 
    /// <returns>The created kernel.</returns> 
    private static IKernel CreateKernel()
    {
        var kernel = new StandardKernel();
        kernel.Bind<Func<IKernel>>().ToMethod(ctx => () => new Bootstrapper().Kernel);
        kernel.Bind<IHttpModule>().To<HttpApplicationInitializationHttpModule>();

        RegisterServices(kernel);
        System.Web.Http.GlobalConfiguration.Configuration.DependencyResolver = new Ninject.WebApi.DependencyResolver.NinjectDependencyResolver(kernel);
        return kernel;
    }


    /// <summary> 
    /// Load your modules or register your services here! 
    /// </summary> 
    /// <param name="kernel">The kernel.</param> 
    private static void RegisterServices(IKernel kernel)
    {
        //kernel.Load(Assembly.GetExecutingAssembly());
        kernel.Bind<IUnitsSL>().To<UnitsSL>();
        kernel.Bind<IForecastLogic>().To<ForecastLogic>();
        kernel.Bind<IForecastRepositoryAsync>().To<ForecastRepositoryAsync>();
    }
}

这是 Controller

namespace ForecastApi.Controllers
{
  public class ForecastController : ApiController
{
    private IUnitsSL _serviceLayer { get; set; }
    private readonly IForecastLogic _forecastLogic;
    public ForecastController(IForecastLogic forecastLogic)
    {
        _forecastLogic = forecastLogic;
        _serviceLayer = new UnitsSL();
    }
[Route("projection")]
    [HttpPost]
    public async Task<IHttpActionResult> GetDemandForecast([FromBody] 
ProjectionRequestModel model)
    {
        var retVal = await _forecastLogic.GetDemandForecastData(model);
        return Ok(retVal);
    }
}

当我通过 Postman 对此进行测试时，错误消息的确切措辞是:尝试创建“ForecastController”类型的 Controller 时发生错误。确保 Controller 有一个无参数的公共(public)构造函数。”

如果有帮助，我正在为业务调用模拟我的单元测试，它们正在使用 Ninject 库和 Moq。似乎是构造函数失败了。

TIA

Answer 1

无论出于何种原因，完全卸载 Ninject 并重新安装它(这是 3.3 版)解决了问题。如果其他人有类似问题，请将其留在这里。我最初安装

• 注入(inject)
• Ninject.Web.Common
• Ninject.Web.Common.WebHost
• Ninject.Web.WebApi
• Ninject.Web.WebApi.WebHost

当我卸载所有这些软件包，然后再次重新安装它们 v3.3 时，添加了 NinjectWebCommon.cs 文件并且一切正常。我只能假设当我滚动自己的公共(public)文件以弥补 Ninject 没有第一次安装它时缺少某些东西。