C# 如何根据Autofac中的可选参数将类注册为singleton?
让我用代码来解释我的问题,所以我有一个类:C# 如何根据Autofac中的可选参数将类注册为singleton?,c#,.net,dependency-injection,inversion-of-control,autofac,C#,.net,Dependency Injection,Inversion Of Control,Autofac,让我用代码来解释我的问题,所以我有一个类: public class ComplexEntity { private readonly ISomeDependency _someDependency; private readonly int _optionalArg; public ComplexEntity(ISomeDependency someDependency, int optionalArg) { _someDependency =
public class ComplexEntity
{
private readonly ISomeDependency _someDependency;
private readonly int _optionalArg;
public ComplexEntity(ISomeDependency someDependency, int optionalArg)
{
_someDependency = someDependency;
_optionalArg = optionalArg;
}
}
和模块:
public class FooModule : Module
{
protected override void OnMap(ContainerBuilder builder)
{
builder.RegisterType<ConcreteDependency>().As<ISomeDependency>().SingleInstance();
builder.RegisterType<ComplexEntity>().AsSelf();//SingleInstance fails my test below.
}
}
在autofac范围内,可以是单例或工厂瞬态,而不是两者。如果你需要更复杂的终身管理,我相信你需要承担责任,自己管理。如果我理解正确,您需要一个范围管理器,它要么生成新实例,要么返回单例。如果您仍然想使用DI,可以将其放入容器中,如下所示:
private const int FactoryMode = 11;
private const int SingletonMode = 10;
public static void Main()
{
var containerBuilder = new ContainerBuilder();
containerBuilder.RegisterType<ComplexTypeScope>().SingleInstance();
containerBuilder.Register((c, p) => c.Resolve<ComplexTypeScope>().Get(p.TypedAs<int>()));
var container = containerBuilder.Build();
ComplexType instance1 = container.Resolve<ComplexType>(new TypedParameter(typeof(int), SingletonMode));
ComplexType instance2 = container.Resolve<ComplexType>(new TypedParameter(typeof(int), SingletonMode));
ComplexType instance3 = container.Resolve<ComplexType>(new TypedParameter(typeof(int), FactoryMode));
Debug.Assert(ReferenceEquals(instance1, instance2));
Debug.Assert(!ReferenceEquals(instance1, instance3));
}
class ComplexType
{
}
class ComplexTypeScope
{
private readonly Lazy<ComplexType> complexTypeSingleTon;
public ComplexTypeScope()
{
complexTypeSingleTon = new Lazy<ComplexType>(() => new ComplexType());
}
public ComplexType Get(int parameter)
{
return parameter == FactoryMode ? new ComplexType() : complexTypeSingleTon.Value;
}
}
当然,使用这种方法,容器不会管理组件的寿命,比如自动处理。我不明白您在这里想要实现什么。看起来您正在测试模块中注册测试类型。那么,为什么你不能根据考试的要求进行注册呢?@DanielHilgarth,好的,我删除了所有提到的考试内容。你有多少不同的网上辩论?在您构建容器时是否知道它们?@nemesv,通常是一个,但这不重要。是的,他们都知道。所以我发现没有办法-我必须手动实现缓存机制:
private const int FactoryMode = 11;
private const int SingletonMode = 10;
public static void Main()
{
var containerBuilder = new ContainerBuilder();
containerBuilder.RegisterType<ComplexTypeScope>().SingleInstance();
containerBuilder.Register((c, p) => c.Resolve<ComplexTypeScope>().Get(p.TypedAs<int>()));
var container = containerBuilder.Build();
ComplexType instance1 = container.Resolve<ComplexType>(new TypedParameter(typeof(int), SingletonMode));
ComplexType instance2 = container.Resolve<ComplexType>(new TypedParameter(typeof(int), SingletonMode));
ComplexType instance3 = container.Resolve<ComplexType>(new TypedParameter(typeof(int), FactoryMode));
Debug.Assert(ReferenceEquals(instance1, instance2));
Debug.Assert(!ReferenceEquals(instance1, instance3));
}
class ComplexType
{
}
class ComplexTypeScope
{
private readonly Lazy<ComplexType> complexTypeSingleTon;
public ComplexTypeScope()
{
complexTypeSingleTon = new Lazy<ComplexType>(() => new ComplexType());
}
public ComplexType Get(int parameter)
{
return parameter == FactoryMode ? new ComplexType() : complexTypeSingleTon.Value;
}
}