我有一个类(Service
)接收2个参数(一个IClient
和一个ICounter
)。
我希望 Unity为两者注入相同的实例(实现两个接口的Decorator
)。
但是怎么做呢?
还有一件事:我希望 Unity 使用每线程为基础注入相同的实例来Service
。也就是说,在每个线程中,每次调用container.Resolve<Service>()
时,都应将相同的Decorator
实例注入到Service
的两个参数
这是我到目前为止的代码。我只注册类型并运行,但创建了 3 个装饰器类实例。在这种情况下,只有一个线程,只应创建一个装饰器实例。
您可以使用DotNetFiddle运行它:https://dotnetfiddle.net/Widget/m3PRQz
using System;
using Microsoft.Practices.Unity;
namespace ConsoleApplication1
{
public class Program
{
public static void Main(string[] args)
{
var container = new UnityContainer();
container.RegisterType<IClient>(new InjectionFactory(c => new Decorator(c.Resolve<Client>())));
container.RegisterType<ICounter, Decorator>();
container.Resolve<Service>();
Console.WriteLine(Decorator.NumberOfInstances + " instances of Decorator have been created");
}
}
public class Client : IClient
{
}
public class Decorator : IClient, ICounter
{
public static int NumberOfInstances { get; private set; }
public Decorator(IClient client)
{
NumberOfInstances++;
}
}
public interface ICounter
{
}
public interface IClient
{
}
public class Service
{
public Service(IClient client, ICounter counter)
{
}
}
}
编辑:如果我不使用DI,我会编写此代码。请记住,为简单起见,我不调用任何方法。
public class Program
{
public static void Main(string[] args)
{
var t1 = Task.Run(() => CreateService());
var t2 = Task.Run(() => CreateService());
}
private static Service CreateService()
{
var decorator = new Decorator(new Client());
return new Service(decorator, decorator);
}
}
你可以尝试这样的事情:
寄存器每个线程的装饰器:
container.RegisterType<Decorator>(
new PerThreadLifetimeManager(),
new InjectionFactory(c => new Decorator(c.Resolve<Client>())));
将接口映射到装饰器:
container.RegisterType<ICounter, Decorator>();
container.RegisterType<IClient, Decorator>();