確保控制器具有使用Ninject

Question

這裏一個無參數的公共構造函數是手頭上的問題：

儘管打電話給我CustomerController通過URL，我得到以下異常：

ExceptionMessage ：

嘗試創建類型爲 'CustomerController'的控制器時發生錯誤。確保控制器具有 無參數公共構造函數。

我使用以下網址：

• http://localhost:55555/api/Customer/
• http://localhost:55555/api/Customer/8

請注意：的/api/Customer/電話進行工作前，我重構邏輯到業務類和實現依賴注入。

我的研究表明，我沒有正確註冊我的界面和類與Ninject，但不知道我錯過了什麼步驟。

鏈接研究之：

• Make sure that the controller has a parameterless public constructor error
• Make sure that the controller has a parameterless public constructor in Unity

這裏是我的問題是什麼原因造成這個異常？我在Ninject內註冊了我的界面/類，但它似乎無法正確識別映射。有什麼想法嗎？

客戶控制器

public class CustomerController : ApiController 
{ 
    private readonly ICustomerBusiness _customerBusiness; 

    public CustomerController(ICustomerBusiness customerBusiness) 
    { 
     _customerBusiness = customerBusiness; 
    } 

    // GET api/Customer 
    [HttpGet] 
    public IEnumerable<Customer> GetCustomers() 
    { 
     return _customerBusiness.GetCustomers(); 
    } 

    // GET api/Customer/Id 
    [HttpGet] 
    public IEnumerable<Customer> GetCustomersById(int customerId) 
    { 
     return _customerBusiness.GetCustomerById(customerId); 
    } 
} 

客戶業務

public class CustomerBusiness : ICustomerBusiness 
{ 
    private readonly DatabaseContext _databaseContext = new DatabaseContext(); 

    public IEnumerable<Customer> GetCustomers() 
    { 
     return _databaseContext.Customers; 
    } 

    public IQueryable<Customer> GetCustomerById(int customerId) 
    { 
     return _databaseContext.Customers.Where(c => c.CustomerId == customerId); 
    }  
} 

客戶業務接口

public interface ICustomerBusiness 
{ 
    IQueryable<Customer> GetCustomerById(int customerId); 
    IEnumerable<Customer> GetCustomers(); 
} 

NinjectWebCommon

using System; 
using System.Web; 
using Microsoft.Web.Infrastructure.DynamicModuleHelper; 
using MyReservation.API; 
using MyReservation.API.Business; 
using Ninject; 
using Ninject.Web.Common; 

[assembly: WebActivatorEx.PreApplicationStartMethod(typeof(NinjectWebCommon), "Start")] 
[assembly: WebActivatorEx.ApplicationShutdownMethodAttribute(typeof(NinjectWebCommon), "Stop")] 

namespace MyReservation.API 
{ 
    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(); 
      try 
      { 
       kernel.Bind<Func<IKernel>>().ToMethod(ctx =>() => new Bootstrapper().Kernel); 
       kernel.Bind<IHttpModule>().To<HttpApplicationInitializationHttpModule>(); 

       RegisterServices(kernel); 
       return kernel; 
      } 
      catch 
      { 
       kernel.Dispose(); 
       throw; 
      } 
     } 

     /// <summary> 
     /// Load your modules or register your services here! 
     /// </summary> 
     /// <param name="kernel">The kernel.</param> 
     private static void RegisterServices(IKernel kernel) 
     { 
      kernel.Bind<ICustomerBusiness>().To<CustomerBusiness>(); 
     }   
    } 
} 

Answer 1

對於同樣的問題，我安裝的NuGet包

• ninject
• ninject.web.common
• ninject.web.common .webhost
• ninject.web.webapi

• ninject.web.webapi.webhost

  和工作