文档指出,Autofac支持开放的泛型,并且我能够在基本情况下进行注册和解析,如下所示:
注册:
builder.RegisterGeneric(typeof(PassThroughFlattener<>))
.As(typeof(IFlattener<>))
.ContainerScoped();
解决:
var flattener = _container.Resolve<IFlattener<Address>>();
以上代码可以正常工作。但是,假设在运行时之前我不知道提供给IFlattener的类型,我想做这样的事情:
object input = new Address();
var flattener = (IFlattener)_container.Resolve(typeof(IFlattener<>), new TypedParameter(typeof(IFlattener<>), input.GetType()));
AutoFac可以吗?我从以下使用StructureMap得到的想法:
http://structuremap.sourceforge.net/Generics.htm
我正在尝试实现本文概述的相同目标。
var openType = typeof(IFlattener<>);
var builder = new ContainerBuilder();
builder.RegisterGeneric(typeof(PassThroughFlattener<>)).As(openType);
builder.Register<AddressFlattener>().As<IFlattener<Address>>();
builder.Register<Func<object, IFlattener>>(context => theObject =>
{
var closedType =
openType.MakeGenericType(theObject.GetType());
return (IFlattener) context.Resolve(closedType,
new PositionalParameter(0, theObject));
});
var c = builder.Build();
var factory = c.Resolve<Func<object, IFlattener>>();
var address = new Address();
var addressService = factory(address);
Assert.That(addressService, Is.InstanceOfType(typeof(AddressFlattener)));
var anything = "any other data";
var anyService = factory(anything);
Assert.That(anyService, Is.InstanceOfType(typeof(PassThroughFlattener<string>)));
var addressFlattener = _container.Resolve(typeof(IFlattener<>).MakeGenericType(typeof(Address)));