[英]Resolve IEnumerable with Autofac
我正在尝试使用Mediatr和Autofac构建中介程序管道,但正在努力解决Autofac的验证程序集合。
public class MediatorPipeline<TRequest, TResponse>
: IAsyncRequestHandler<TRequest, TResponse> where TRequest : IAsyncRequest<TResponse>
{
private readonly IAsyncRequestHandler<TRequest, TResponse> _inner;
private readonly IEnumerable<IValidator<TRequest>> _validators;
public MediatorPipeline(IAsyncRequestHandler<TRequest, TResponse> inner,
IEnumerable<IValidator<TRequest>> validators)
{
_inner = inner;
_validators = validators;
}
...
}
当我在构造函数中放入IValidator<TRequest>
时,它可以很好地解决,但是当我将IEnumerable<IValidator<TRequest>>
放入时,它会失败,但以下情况除外:
容器或服务定位器配置不正确,或者处理程序未在容器中注册。 ---> Autofac.Core.DependencyResolutionException:激活特定注册期间发生错误。
这是我的注册码:
builder.RegisterAssemblyTypes(assembly)
.Where(t => t.IsClosedTypeOf(typeof(IValidator<>)))
.AsImplementedInterfaces()
.InstancePerLifetimeScope();
使用此替代注册,我得到了相同的结果:
var openGenericType = typeof(IValidator<>);
var query = from type in assembly.GetTypes().Where(c => !(c.GetTypeInfo().IsAbstract || c.GetTypeInfo().IsGenericTypeDefinition))
let interfaces = type.GetInterfaces()
let genericInterfaces = interfaces.Where(i => i.GetTypeInfo().IsGenericType && i.GetGenericTypeDefinition() == openGenericType)
let matchingInterface = genericInterfaces.FirstOrDefault()
where matchingInterface != null
select new { matchingInterface, type };
foreach (var pair in query)
{
builder.RegisterType(pair.type).As(pair.matchingInterface);
}
任何建议,不胜感激!
首先,很高兴看到整个异常(包括内部异常)与堆栈跟踪。
Autofac公开了一个方便的扩展方法AsClosedTypesOf
,您可以使用以下方式:
builder
.RegisterAssemblyTypes(ThisAssembly)
.AsClosedTypesOf(typeof(IValidator<>))
.InstancePerLifetimeScope();
这将为您完成工作,因此您无需深入思考即可注册验证器。
然后,您需要在它们之上注册处理程序和装饰器:
builder
.RegisterAssemblyTypes(ThisAssembly)
.AsClosedTypesOf(typeof(IAsyncRequestHandler<,>), "base-handler")
.InstancePerDependency();
builder.RegisterGenericDecorator(
typeof(MediatorPipeline<,>),
typeof(IAsyncRequestHandler<,>),
"base-handler");
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