使用Microsoft.Extensions.DependencyInjection解析开放泛型类型

Question

我是以下代码

public void Test()  
{
   // Configure DI
   IServiceCollection services = new ServiceCollection();

   services.AddTransient<IEngine<MetaData>, myEngine>(); 
   // Tried
   // services.AddTransient(typeof(IEngine<>), typeof(Engine<MetaData>));

   var provider = services.BuildServiceProvider();

   // Request Instance from DI, at this point I dont want to have to that 
   // tell it I want and Engine with a MetaData
   var engine1 = provider.GetRequiredService <IEngine<MetaData>>();
}

我的课程看起来像

public class myEngine : IEngine<MetaData>
{
    public IReader<MetaData> Reader { get; set; }
}

public class MetaData
{
    public int Age { get; set; }
    public string Name { get; set; }
}

public class Engine<T> : IEngine<T>
{
    public IReader<T> Reader { get; set; }

    public Engine(IReader<T> reader)
    {
        Reader = reader;
    }
}

public interface IReader<T>
{
    T MetaData { get; set; }
}

public interface IEngine<T>
{
    IReader<T> Reader { get;set;}

}

我更喜欢这段代码，因为我不在乎T是什么

var engine2 = provider.GetRequiredService(typeof(IEngine<>));