但是,我找不到实际将其集成到Web应用程序中的任何扩展(例如类似于Ninject.Web.Common)
查看旧的ASP.NET MVC解决方案中的代码,我意识到整个机制是不同的,因为经典的机制依赖于Web核心中不再可用的WebActivatorEx.PreApplicationStartMethod和WebActivatorEx.ApplicationShutdownMethodAttribute.
此外,旧的Ninject.Web.Common程序集提供了几个用于初始化的有用类–Bootstrapper,OnePerRequestHttpModule,NinjectHttpModule：
public static void Start()
{
DynamicModuleUtility.RegisterModule(typeof(OnePerRequestHttpModule));
DynamicModuleUtility.RegisterModule(typeof(NinjectHttpModule));
Bootstrapper.Initialize(CreateKernel);
}
问题：有没有关于如何将Ninject集成到ASP.NET Core 2.0 Web应用程序中的示例？
解决方法
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,我设法创建了一个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来用于测试DI：实现ITestService的TestService：
public class TestService : ITestService
{
public int Data { get; private set; }
public TestService()
{
Data = 42;
}
}
public interface ITestService
{
int Data { get; }
}
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服务)(最后)
services.AddSingleton<IHttpContextAccessor,HttpContextAccessor>(); services.AddRequestScopingMiddleware(() => scopeProvider.Value = new Scope()); services.AddCustomControllerActivation(Resolve); services.AddCustomViewComponentActivation(Resolve);
3)添加到配置(IApplicationBuilder应用程序,IHostingEnvironment环境,ILoggerFactory loggerFactory)(开头)
Kernel = RegisterApplicationComponents(app,loggerFactory);
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)
在版本4中不推荐使用IKernel,因此应该使用IReadOnlyKernel和IKernelConfiguration类(尽管上面的代码应该可以工作).
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());
}
