MEF部件的添加删除与重排

AddPart/RemovePart

using System;
using System.ComponentModel.Composition;
using System.ComponentModel.Composition.Hosting;
using System.ComponentModel.Composition.Primitives;

class Program
{
    static void Main(string[] args)
    {
        var catalog = new AssemblyCatalog(typeof(Program).Assembly);
        var container = new CompositionContainer(catalog);
        var root = new Root();

        // add external part
        container.ComposeParts(root);

        // ... use the composed root instance

        // removes external part
        batch = new CompositionBatch();
        batch.RemovePart(root);
        container.Compose(batch);
    }
}

public class Root
{
    [Import(RequiredCreationPolicy = CreationPolicy.NonShared)]
    public NonSharedDependency Dep { get; set; }
}

[Export, PartCreationPolicy(CreationPolicy.NonShared)]
public class NonSharedDependency : IDisposable
{
    public NonSharedDependency()
    {
    }

    public void Dispose()
    {
        Console.WriteLine("Disposed");
    }
}

Recomposition 重排

public class HttpServerHealthMonitor
{
    [ImportMany(AllowRecomposition=true)]
    public IMessageSender[] Senders { get; set; }