C# 网络API 2 Ninject“;尝试创建控制器时出错";
加载控制器时出现此错误C# 网络API 2 Ninject“;尝试创建控制器时出错";,c#,asp.net-web-api,dependency-injection,ninject,asp.net-web-api2,C#,Asp.net Web Api,Dependency Injection,Ninject,Asp.net Web Api2,加载控制器时出现此错误 An error occurred when trying to create a controller of type 'MembersController'. Make sure that the controller has a parameterless public constructor. 我补充说 System.Web.Http.GlobalConfiguration.Configuration.DependencyResolver = new Ninje
An error occurred when trying to create a controller of type 'MembersController'. Make sure that the controller has a parameterless public constructor.
我补充说
System.Web.Http.GlobalConfiguration.Configuration.DependencyResolver = new Ninject.WebApi.DependencyResolver.NinjectDependencyResolver(kernel);
注册绑定后,将其发送到NinjectWebCommon
类
我已经注册了相关服务。请参见编辑
私有静态无效注册服务(IKernel内核)
{
Bind();
Bind();
}
以下是我添加的ninject包-
<package id="Ninject" version="3.2.0.0" targetFramework="net451" />
<package id="Ninject.MVC5" version="3.2.1.0" targetFramework="net451" />
<package id="Ninject.Web.Common" version="3.2.0.0" targetFramework="net451" />
<package id="Ninject.Web.Common.WebHost" version="3.2.0.0" targetFramework="net451" />
<package id="Ninject.Web.WebApi" version="3.2.4.0" targetFramework="net451" />
<package id="Ninject.WebApi.DependencyResolver" version="0.1.4758.24814" targetFramework="net451" />
我错过了什么
编辑
多亏了我与杰罗德·霍顿(Jerrod Horton)(见下文)的对话,我意识到我的装订工作不正确
应该是
private static void RegisterServices(IKernel kernel)
{
kernel.Bind<IMembersService>().To<MembersService>();
kernel.Bind<MemberContext>().To<MemberContext>();
}
私有静态无效注册服务(IKernel内核)
{
kernel.Bind().To();
kernel.Bind().To();
}
您的一个依赖项(或依赖项的依赖项)未在IoC容器中完全注册。当web api尝试解析控制器时,如果它没有它所需的每个依赖项,那么它将失败;如果您的IoC容器正在尝试解析ProductRepository,但ProductRepository在其构造函数ISqlConnectionProvider中需要,那么您也必须向您的IoC容器注册ISqlConnectionProvider
我会从控制器开始。查看所有输入参数。确保每个都已在IoC容器中注册。然后检查这些类中的每一个,并确保这些类中的任何依赖项都已注册(依此类推)
这是我为Ninject编写的代码。此代码存在于名为NinjectWebCommon.cs的App_Start文件夹中
[assembly: WebActivatorEx.PreApplicationStartMethod(typeof(YourProject.App_Start.NinjectWebCommon), "Start")]
[assembly: WebActivatorEx.ApplicationShutdownMethodAttribute(typeof(YourProject.App_Start.NinjectWebCommon), "Stop")]
namespace YourProject.App_Start
{
using System;
using System.Web;
using Microsoft.Web.Infrastructure.DynamicModuleHelper;
using Ninject;
using Ninject.Web.Common;
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)
{
}
}
}
[程序集:webactivatex.PreApplicationStartMethod(typeof(YourProject.App\u Start.NinjectWebCommon),“Start”)]
[assembly:WebActivatorEx.ApplicationShutdownMethodAttribute(typeof(YourProject.App_Start.NinjectWebCommon),“Stop”)]
名称空间YourProject.App\u Start
{
使用制度;
使用System.Web;
使用Microsoft.Web.Infrastructure.DynamicModuleHelper;
使用Ninject;
使用Ninject.Web.Common;
公共静态类NinjectWebCommon
{
私有静态只读引导程序Bootstrapper=new Bootstrapper();
///
///启动应用程序
///
公共静态void Start()
{
RegisterModule(typeof(OnePerRequestHttpModule));
RegisterModule(typeof(NinjectHttpModule));
初始化(CreateKernel);
}
///
///停止应用程序。
///
公共静态无效停止()
{
bootstrapper.ShutDown();
}
///
///创建将管理应用程序的内核。
///
///创建的内核。
私有静态IKernel CreateKernel()
{
var kernel=新的标准内核();
尝试
{
kernel.Bind().ToMethod(ctx=>()=>newbootstrapper().kernel);
kernel.Bind().To();
注册服务(内核);
返回内核;
}
抓住
{
Dispose();
投掷;
}
}
///
///在这里加载您的模块或注册您的服务!
///
///内核。
私有静态无效注册服务(IKernel内核)
{
}
}
}
packages.config Ninject代码段
<package id="Ninject" version="3.2.2.0" targetFramework="net45" />
<package id="Ninject.Web.Common" version="3.2.3.0" targetFramework="net45" />
<package id="Ninject.Web.Common.WebHost" version="3.2.3.0" targetFramework="net45" />
<package id="Ninject.Web.WebApi" version="3.2.4.0" targetFramework="net45" />
<package id="Ninject.Web.WebApi.WebHost" version="3.2.4.0" targetFramework="net45" />
packages.config web api和asp.net代码段
<package id="Microsoft.AspNet.Mvc" version="5.2.3" targetFramework="net45" />
<package id="Microsoft.AspNet.Razor" version="3.2.3" targetFramework="net45" />
<package id="Microsoft.AspNet.Web.Optimization" version="1.1.3" targetFramework="net45" />
<package id="Microsoft.AspNet.WebApi" version="5.2.3" targetFramework="net45" />
<package id="Microsoft.AspNet.WebApi.Client" version="5.2.3" targetFramework="net45" />
<package id="Microsoft.AspNet.WebApi.Core" version="5.2.3" targetFramework="net45" />
<package id="Microsoft.AspNet.WebApi.HelpPage" version="5.2.0" targetFramework="net45" />
<package id="Microsoft.AspNet.WebApi.WebHost" version="5.2.3" targetFramework="net45" />
<package id="Microsoft.AspNet.WebPages" version="3.2.3" targetFramework="net45" />
<package id="Microsoft.jQuery.Unobtrusive.Validation" version="3.2.0" targetFramework="net45" />
<package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net45" />
简短回答:
您需要安装所有这些软件包:
- 尼尼特
- Ninject.Extensions.Conventions
- Ninject.Web.Common
- Ninject.Web.Mvc
- Ninject.Web.WebApi
- Ninject.Web.WebApi.WebHost
在大多数情况下,缺少其中一个是导致问题的原因。我有所有两个依赖项。我编辑了我的响应,以包含适用于我的代码。希望这能帮到你。“”注册服务“方法是我注册依赖项的方法。我们100%使用web api 2。我已经用ninject的packages.config中的代码片段更新了响应。它似乎对我有用,没问题。我记得和你有过类似的问题。一旦设置好,它就可以完美地工作。如果设置不正确,您会遇到令人沮丧的问题,比如您正在遇到的问题。如果您复制并粘贴我的代码到您的代码中,它应该可以工作。确保安装了MVC Ninject nuget软件包(看起来是这样的)。我将所有的Ninject软件(逐字逐句)粘贴在我的回复底部,以便您可以看到它们。为了以防万一,我也会继续发布web api。有一个MVC和WebAPI的联合项目-在新项目中缺少Ninject.web.WebAPI,但给了我这个令人困惑的错误,而不是更合理的东西
<package id="Microsoft.AspNet.Mvc" version="5.2.3" targetFramework="net45" />
<package id="Microsoft.AspNet.Razor" version="3.2.3" targetFramework="net45" />
<package id="Microsoft.AspNet.Web.Optimization" version="1.1.3" targetFramework="net45" />
<package id="Microsoft.AspNet.WebApi" version="5.2.3" targetFramework="net45" />
<package id="Microsoft.AspNet.WebApi.Client" version="5.2.3" targetFramework="net45" />
<package id="Microsoft.AspNet.WebApi.Core" version="5.2.3" targetFramework="net45" />
<package id="Microsoft.AspNet.WebApi.HelpPage" version="5.2.0" targetFramework="net45" />
<package id="Microsoft.AspNet.WebApi.WebHost" version="5.2.3" targetFramework="net45" />
<package id="Microsoft.AspNet.WebPages" version="3.2.3" targetFramework="net45" />
<package id="Microsoft.jQuery.Unobtrusive.Validation" version="3.2.0" targetFramework="net45" />
<package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net45" />