MEF如何删除部件，有一段代码始终运行不正确

MEF怎么删除部件，有一段代码始终运行不正确？
http://mef.codeplex.com/wikipage?title=Parts%20Lifetime&referringTitle=Guide
从上面拷贝的代码运行始终不正确，怎么才能正确的删除部件？

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

        var batch = new CompositionBatch();


//这里始终报错？？？

        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");

    }

}

------最佳解决方案--------------------

引用:

public void Dispose() 
    { 
        Console.WriteLine("Disposed"); 
    }
例子的意思就是Dispose没有调用啊？删除部件后就应该调用啊？

引用:引用:
你好，我试了一下，可是还是没有删除：
C# c……

试试下面这段代码。

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.ComponentModel.Composition;

using System.ComponentModel.Composition.Hosting;

using System.ComponentModel.Composition.Primitives;


namespace ConsoleApplication1

{



    class Program

    {

        static void Main(string[] args)

        {

            var catalog = new AssemblyCatalog(typeof(Program).Assembly);

            var container = new CompositionContainer(catalog);

            var root = new Root();


            container.ComposeParts(root);