Unity 不使用配置文件解析嵌套的通用参数，而是使用 UnityContainer 解析

Question

我正在尝试从文件 Unity.config 加载 Unity 配置。在接口的实现中使用了通用参数 我的配置文件：

<?xml version="1.0" encoding="utf-8" ?>
<unity xmlns="http://schemas.microsoft.com/practices/2010/unity">

  <assembly name="TestUnityGeneric" />
  <namespace name="TestUnityGeneric"/>

  <container name="Entity">

    <register type="IEventBus`2[IEvent`1[long],long]" mapTo="TestEventBus`2[IEvent`1[long],long]"></register>

    <register type="ISender" mapTo="TestSender">
      <constructor>
        <param name="eventBus" dependencyType="IEventBus`2[IEvent`1[long], long]" />
      </constructor>
    </register>
  </container>
</unity>

配置无效。 但下一个 C# 代码有效：

public interface IEvent<out Key>
{
    Key SourceId { get; }
}

public interface IEventBus<E, in Key>
    where E : IEvent<Key>
{
    void Publish(E @event);
}

public class TestEventBus<E, Key> : IEventBus<E, Key>
where E : IEvent<Key>
{
    public void Publish(E @event)
    {
        Console.WriteLine("Message published!");
    }
}

public interface ISender
{
    void SendToBus(string message);
}

public class TestSender : ISender
{
    private IEventBus<IEvent<long>, long> _bus { get; set; }

    public TestSender(IEventBus<IEvent<long>,long> eventBus)
    {
        Console.WriteLine("Sender Initialized");
        _bus = eventBus;
    }

    public void SendToBus(string message)
    {
        IEvent<long> env = new TestEvent
        {
            SourceId = 1,
            Message = message
        };

        _bus.Publish(env);
    }
}

public class TestEvent : IEvent<long>
{
    public long SourceId { get; set; }

    public string Message { get; set; }
}

class Program
{
    static void Main(string[] args)
    {
        // It Is not worked: Exception: "GenericArguments violates the constraint of type paremeter "E""
        IUnityContainer container = new UnityContainer().LoadConfiguration(ConfigurationManager.AppSettings["UnityContainer"]);

        // This is worked
        /*
        IUnityContainer container = new UnityContainer();

        IEventBus<IEvent<long>, long> bus = new TestEventBus<IEvent<long>, long>();

        container.RegisterInstance<IEventBus<IEvent<long>, long>>(bus);

        container.RegisterType<ISender, TestSender>(new TransientLifetimeManager(),
            new InjectionConstructor(typeof(IEventBus<IEvent<long>, long>)));
        */

        var sender = container.Resolve<ISender>();

        sender.SendToBus("MyMessage");

        Console.ReadKey();   
    }
}

所有项目代码：HERE

Answer 1

已解决

事实证明，Unity 不理解 Unity.config 文件中的嵌套泛型。解决方案：使用 Alias，并且 Alias One 不应使用其他别名。此配置 - 有效：

<?xml version="1.0" encoding="utf-8" ?>
<unity xmlns="http://schemas.microsoft.com/practices/2010/unity">

  <assembly name="TestUnityGeneric" />
  <namespace name="TestUnityGeneric"/>

  <alias alias="IEventLong" type="TestUnityGeneric.IEvent`1[System.Int64], TestUnityGeneric" />

  <container name="Entity">
    <register type="IEventBus`2[IEventLong,long]" mapTo="TestEventBus`2[IEventLong,long]"></register>

    <register type="ISender" mapTo="TestSender">
      <constructor>
        <param name="eventBus" dependencyType="IEventBus`2[IEventLong, long]" />
      </constructor>
    </register>
  </container>
</unity>

Unity 不使用配置文件解析嵌套的通用参数，而是使用 UnityContainer 解析

Unity not resolve nested generic arguments using the configuration file, but resolve using UnityContainer

c#

generics

app-config

unity-container

已解决