使用Autofac按属性解析不同的实例

using Autofac;
using Autofac.Extras.AttributeMetadata;

public interface IService
{
    void Execute();
}

[MetadataAttribute]
[AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
public class ServiceKeyAttribute : Attribute
{
    public string Key { get; }

    public ServiceKeyAttribute(string key)
    {
        Key = key;
    }
}

public class ServiceA : IService
{
    public void Execute()
    {
        Console.WriteLine("Service A executed.");
    }
}

public class ServiceB : IService
{
    public void Execute()
    {
        Console.WriteLine("Service B executed.");
    }
}

public class Consumer
{
    [ServiceKey("A")]
    public IService ServiceA { get; set; }

    [ServiceKey("B")]
    public IService ServiceB { get; set; }

    public void ExecuteServices()
    {
        ServiceA.Execute();
        ServiceB.Execute();
    }
}

public class Program
{
    public static void Main()
    {
        var builder = new ContainerBuilder();
        builder.RegisterType<ServiceA>().Keyed<IService>("A");
        builder.RegisterType<ServiceB>().Keyed<IService>("B");
        builder.RegisterType<Consumer>().WithAttributeFiltering();

        var container = builder.Build();
        var consumer = container.Resolve<Consumer>();
        consumer.ExecuteServices();
    }
}

Service A executed.
Service B executed.