Mini 容器学习笔记13——插件注入

　　Mini容器的插件注入是通过InjectMany的方式来注入多个组件的方式进行的，插件的元数据通过标签的方式进行配置，Mini容器在注入插件的过程中同时也可以把插件的元数据一起注入，这和MEF实现插件框架是一样的。下面看看Mini容器怎样来实现插件架构的。

1. 定义插件接口契约，插件元数据标签以及插件元数据接口

   //插件接口
    [Contract]
    public interface IAddIn
    {
        void Start();//启动插件
    }

   

    //插件配置元数据标签
    [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
    [MetadataAttributeAttribute]
    public class AddInAttribute : ComponentAttribute
    {
        public string Name { get; set; }
        public string Author;
        public string Url;
        public string Version;
    }

    //插件元数据接口
    public interface IAddInMetadata
    {
        string Name { get; }
        string Author { get; }
        string Url { get; }
        string Version { get; }
    }

2. 定义插件管理器

   //插件管理器接口，用来启动和停止插件的
    [Contract]
    public interface IAddInManager:IStartable
    {
    }

    [Component]
    public class AddInManager:IAddInManager
    {
        [InjectMany]
        IEnumerable<Lazy<IAddIn, IAddInMetadata>> AddIns { get; set; }

        public void Start()
        {
            foreach (var item in AddIns)
            {
                Console.WriteLine(string.Format("Name={0},Author={1},Url={2},Version={3}", item.Metadata.Name,item.Metadata.Author,item.Metadata.Url,item.Metadata.Version));
                item.Value.Start();
            }
        }

        public void Stop()
        {
        }
    }

3. 实现插件

public abstract class AddInBase : IAddIn    {        public virtual void Start() { }    }

[AddIn(Name = "Dashboard", Author = "Kevin Wang", Url = "http://netcasewqs.cnblogs.com", Version = "1.0")]
    public class DashboardAddIn : AddInBase
    {
        public override void Start()
        {
            Console.WriteLine("Dashboard start...");
        }
    }

    [AddIn(Name = "Editor", Author = "Kevin Wang", Url = "http://netcasewqs.cnblogs.com", Version = "1.0")]
    public class EditorAddIn : AddInBase
    {
        public override void Start()
        {
            Console.WriteLine("Editer start...");
        }
    }

    [AddIn(Name = "PlayList", Author = "Kevin Wang", Url = "http://netcasewqs.cnblogs.com", Version = "1.0")]
    public class PlaylistAddIn : AddInBase
    {
        public override void Start()
        {
            Console.WriteLine("PlayList start...");
        }
    }

4. 创建宿主程序并测试

[TestFixture]
    public class AddInTest:TestBase
    {
        [Inject]
        IAddInManager AddInManager;

        [Test]
        public void Test()
        {
            ServiceRegistry
                .Register<AddInManager>()
                .Register<DashboardAddIn>()
                .Register<EditorAddIn>()
                .Register<PlaylistAddIn>();


            ServiceRegistry.Compose(this);
        }
    }

5. 查看运行结果：