ResolveAll 某种类型的 Autofac

ResolveAll of certain type with Autofac

在 ASP.NET 核心项目启动时,我有:

services.AddScoped<SingleInstanceFactory>(x => y => x.GetRequiredService(y));
services.AddScoped<MultiInstanceFactory>(x => y => x.GetRequiredServices(y));

我正在尝试使用 Autofac 4,所以我尝试了:

builder.Register<SingleInstanceFactory>(y => z => y.Resolve(z)).InstancePerLifetimeScope();
builder.Register<MultiInstanceFactory>(y => z => y.ResolveAll(z)).InstancePerLifetimeScope();

但是,Autofac 似乎没有 ResolveAll 方法。

我该如何解决这个问题?

更新

我还尝试创建以下扩展:

public static T[] ResolveAll<T>(this IContainer container) {
  return container.Resolve<IEnumerable<T>>().ToArray();
}

public static Object[] ResolveAll(this IContainer container, Type type) {
  Type enumerable = typeof(IEnumerable<>).MakeGenericType(type);
  return (Object[])container.ResolveService(new TypedService(enumerable));
}

并按如下方式使用:

x.Register<MultiInstanceFactory>(y => z => y.ResolveAll(z)).InstancePerLifetimeScope();   

但我得到错误:

Cannot convert lambda expression to intended delegate type because some of the return types in the block are not implicitly convertible to the delegate return type

不确定我错过了什么......有什么想法吗?

解析T的所有注册服务,可以解析IEnumerable<T>

顺便说一下,您正在尝试注册 Autofac 不需要的委托(请参阅 delegate factory) and because Autofac automatically use composition (see Composing Relationship Types),您不需要注册任何内容。

如果您想解决 MultiInstanceFactorySingleInstanceFactory 您不需要在 Autofac

中注册任何内容