我发现 Ninject 最近有 introduced support for .NET Standard 2.0 / .NET Core 2.0 .
但是,我找不到任何扩展以将其实际集成到 Web 应用程序中(例如类似于 Ninject.Web.Common )
查看旧的 ASP.NET MVC 解决方案的代码,我意识到整个机制与经典的依赖 WebActivatorEx.PreApplicationStartMethod
的机制不同。和 WebActivatorEx.ApplicationShutdownMethodAttribute
这些在 ASP.NET Core 中不再可用。
另外,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?
最佳答案
简短的回答:
查看this project .但是,它依赖于仍处于 beta 版本的 Ninject 4.0.0,它似乎与最终版本 (source) 相去甚远。对于 Ninject 3.3.x 看下面。
长答案:
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) 包括AspNetCoreExtensions.cs和 AspNetCoreMvcExtensions.cs在你的项目中。
2) 创建一个用于测试 DI 的非常简单的服务: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
更改
Startup.cs
如下所示: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)
(在末尾)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)
(一开始)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(inject) Controller 、在测试服务构造函数中设置断点并检查调用堆栈来测试 DI。除了提供实异常(exception),调用堆栈还应命中自定义代码以集成 Ninject(例如
ConfigureRequestScoping
方法)Ninject 4.0.0
IKernel
在版本 4 中已弃用,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) 相同
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) 扩展名必须使用
IKernelConfiguration
public static class BindingHelpers
{
public static void BindToMethod<T>(
this IKernelConfiguration config, Func<T> method) =>
config.Bind<T>().ToMethod(c => method());
}
关于ninject - 如何将 Ninject 集成到 ASP.NET Core 2.0 Web 应用程序中?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46693305/