如何将Ninject集成到ASP.NET Core 2.0 Web应用程序中？

1 回答

• 13

  简答：

  检查this project . 但是，它依赖于仍然处于测试版的Ninject 4.0.0，它似乎远不是最终版本（source） . 对于Ninject 3.3.x，请看下面 .

  答案很长：

  感谢 @Steven 我设法创建了ASP.NET Core 2.0和Ninject（3.3.x和4.0）的工作解决方案 . 代码主要来自Missing-Core-DI-Extensions Git repo，非常感谢dotnetjunkie .

  无论引用的Ninject版本如何，都必须执行以下操作：

  1）在项目中包含AspNetCoreExtensions.cs和AspNetCoreMvcExtensions.cs .

  2）创建一个非常简单的服务用于测试DI： TestService 实现 ITestService ：

  public class TestService : ITestService
  {
      public int Data { get; private set; }
  
      public TestService()
      {
          Data = 42;
      }
  } 
  
  public interface ITestService
  {
      int Data { get; }
  }
  

  Ninject 3.3.x

  如下所示更改 Startup.cs ：

  1）添加这些成员

  private readonly AsyncLocal<Scope> scopeProvider = new AsyncLocal<Scope>();
  private IKernel Kernel { get; set; }
  
  private object Resolve(Type type) => Kernel.Get(type);
  private object RequestScope(IContext context) => scopeProvider.Value;
  

  2）添加到 ConfigureServices(IServiceCollection services) （最后）

  services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
  
  services.AddRequestScopingMiddleware(() => scopeProvider.Value = new Scope());
  services.AddCustomControllerActivation(Resolve);
  services.AddCustomViewComponentActivation(Resolve);
  

  3）添加到 Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory) （开头）

  Kernel = RegisterApplicationComponents(app, loggerFactory);
  

  4）添加以下方法和内部类：

  private IKernel RegisterApplicationComponents(IApplicationBuilder app, ILoggerFactory loggerFactory)
  {
      // IKernelConfiguration config = new KernelConfiguration();
      Kernel = new StandardKernel();
  
      // Register application services
      foreach (var ctrlType in app.GetControllerTypes())
      {
          Kernel.Bind(ctrlType).ToSelf().InScope(RequestScope);
      }
  
      Kernel.Bind<ITestService>().To<TestService>().InScope(RequestScope);
  
      // Cross-wire required framework services
      Kernel.BindToMethod(app.GetRequestService<IViewBufferScope>);
      Kernel.Bind<ILoggerFactory>().ToConstant(loggerFactory);
  
      return Kernel;
  }
  
  private sealed class Scope : DisposableObject { }
  

  5）创建 BindToMethod 扩展方法

  public static class BindingHelpers
  {
      public static void BindToMethod<T>(this IKernel config, Func<T> method) => config.Bind<T>().ToMethod(c => method());
  }
  

  6）通过将自定义服务注入控制器，将断点设置为测试服务构造函数并检查调用堆栈来测试DI . 除了提供一个实例，调用堆栈应该点击自定义代码来集成Ninject（例如 ConfigureRequestScoping 方法）

  Ninject 4.0.0

  IKernel 已在版本4中弃用，因此应使用IReadOnlyKernel和IKernelConfiguration类（尽管上面的代码应该有效） .

  1）使用新类（ IReadOnlyKernel ）

  private readonly AsyncLocal<Scope> scopeProvider = new AsyncLocal<Scope>();
  private IReadOnlyKernel Kernel { get; set; }
  
  private object Resolve(Type type) => Kernel.Get(type);
  private object RequestScope(IContext context) => scopeProvider.Value;
  

  2）3）是一样的

  4）方法略有不同：

  private IReadOnlyKernel RegisterApplicationComponents(IApplicationBuilder app, ILoggerFactory loggerFactory)
  {
      IKernelConfiguration config = new KernelConfiguration();
  
      // Register application services
      foreach (var ctrlType in app.GetControllerTypes())
      {
          config.Bind(ctrlType).ToSelf().InScope(RequestScope);
      }
  
      config.Bind<ITestService>().To<TestService>().InScope(RequestScope);
  
      // Cross-wire required framework services
      config.BindToMethod(app.GetRequestService<IViewBufferScope>);
      config.Bind<ILoggerFactory>().ToConstant(loggerFactory);
  
      return config.BuildReadonlyKernel();
  }
  

  5）扩展必须使用 IKernelConfiguration

  public static class BindingHelpers
  {
      public static void BindToMethod<T>(this IKernelConfiguration config, Func<T> method) => config.Bind<T>().ToMethod(c => method());
  }
  

  回复于 2024-05-01T15:49:20+08:00