Autofac - 通过通用接口解决服务

Question

让我们有下面的代码

public class Handler : IHandle<ICommentInfo>{} 

public class Command1 : ICommentInfo{} 

public interface ICommentInfo{} 

public interface IHandle<T> where T : class{} 

我想解决这样的

var service = c.Resolve<IHandle<Command1>>(); 

服务是这甚至可能吗？

我想这个配置

builder.RegisterType<Handler>().As<IHandle<ICommentInfo>>(); 

但我发现了此异常

The requested service 'Icp.Test.QuerySpec.Class1+IHandle`1[[Icp.Test.QuerySpec.Class1+Command1, Icp.Test.QuerySpec, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' has not been registered. To avoid this exception, either register a component to provide the service, check for service registration using IsRegistered(), or use the ResolveOptional() method to resolve an optional dependency. 

Answer 1

为什么你不想使用这个

ContainerBuilder builder = new ContainerBuilder(); 
builder.RegisterType<LocalCommand>().As(typeof (ICommentInfo)); 
builder.RegisterType<Handler>().As(typeof(IHandle<ICommentInfo>)); 
var c = builder.Build(); 
var handler = c.Resolve<IHandle<ICommentInfo>>(); 

Answer 2

bulider.RegisterSource(new ContravariantRegistrationSource()); 

开关行为。