c# - 简易喷油器 : cannot register Web API controllers with AsyncScopedLifestyle

Question

我正在尝试将 Simple Injector (4.0.12) 集成到我的 .NET (4.6.1) Web API 项目中，但无法找到一种方法来使用正确的 AsyncScopedLifestyle 注册所有 Web API Controller .

当我尝试像这样将 DatabaseProvider 的异步作用域实例注入(inject) Controller 时...

public class DatabaseController : ApiController
{
    private readonly IDatabaseProvider databaseProvider;

    public DatabaseController(IDatabaseProvider databaseProvider)
    {
        this.databaseProvider = databaseProvider;
    }

    [HttpGet]
    public bool CheckDatabaseConnection()
    {
        return databaseProvider.IsConnected();
    }
}

...我收到一个 SimpleInjector.ActivationException 错误如下:

The DatabaseProvider is registered as 'Async Scoped' lifestyle, but the instance is requested outside the context of an active (Async Scoped) scope.

但为什么呢？

---

这是我注册 Controller 的代码:

public static Container Initialize()
{
     var container = new Container();
     container.Options.LifestyleSelectionBehavior = new CustomLifestyleSelectionBehavior();
     container.Options.DefaultScopedLifestyle = new AsyncScopedLifestyle();
     container.RegisterWebApiControllers(GlobalConfiguration.Configuration);

     DependencyProvider.SetResolver(new SimpleInjectorDependencyProvider(container));
     GlobalConfiguration.Configuration.DependencyResolver = 
         new SimpleInjectorWebApiDependencyResolver(container);
     RegisterTypes(container);

     //container.Verify();

     return container; 
 }

public class CustomLifestyleSelectionBehavior : ILifestyleSelectionBehavior
{
    public Lifestyle SelectLifestyle(Type implementationType)
    {
        if (implementationType.GetCustomAttribute<ApplicationScoped>(true) != null)
        {
            return Lifestyle.Singleton;
        }

        return new AsyncScopedLifestyle();
    }
}

如您所见，DefaultScopedLifestyle 设置为 AsyncScopedLifestyle 并且我的 CustomLifestyleSelectionBehavior 为 Controller 返回相同的生活方式。

但是所有 Controller 似乎都被注册为Transient，因为这是所有 Controller 的container.Verify() 的输出:

Exception Type: DiagnosticVerificationException
Exception Message: The configuration is invalid.
The following diagnostic warnings were reported:

-[Disposable Transient Component] DatabaseController is registered as transient, but implements IDisposable.

-[Disposable Transient Component] LoginDataController is registered as transient, but implements IDisposable.
...

有人知道如何将 WebAPIController 注册的生活方式设置为 AsyncScoped 以便我可以注入(inject)异步范围的业务逻辑吗？

Answer 1

在 .NET Core 中添加:

// Sets up the basic configuration that for integrating Simple Injector with
// ASP.NET Core by setting the DefaultScopedLifestyle, and setting up auto
// cross wiring.
services.AddSimpleInjector(_container, options =>
{
    // AddAspNetCore() wraps web requests in a Simple Injector scope and
    // allows request-scoped framework services to be resolved.
    options.AddAspNetCore()
        .AddControllerActivation();
});

通过https://simpleinjector.readthedocs.io/en/latest/aspnetintegration.html