C# WPF Caliburn.Micro框架下利用Mef加载其它项目界面

 //[Export("PluginTestViewModel", typeof(IPluggablePart))]     //[PartCreationPolicy(CreationPolicy.Shared)]     ///也可以这样     [Export(typeof(MefTestViewModel))]//表示此类需要导出，导出的类型为object     public class MefTestViewModel     {         public void MefTestBtn()         {            MessageBox.Show("这是一个mef的测试类");         }         public int Sum(int a ,int b)         {             return a + b;         }     } 

<UserControl x:Class="MefTest.MefTestView"              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"               xmlns:d="http://schemas.microsoft.com/expression/blend/2008"               xmlns:local="clr-namespace:MefTest"              mc:Ignorable="d"               d:DesignHeight="450" d:DesignWidth="800">     <Grid ShowGridLines="True">         <Grid.RowDefinitions>             <RowDefinition Height="*"/>             <RowDefinition Height="*"/>         </Grid.RowDefinitions>         <Grid.ColumnDefinitions>             <ColumnDefinition Width="*"/>             <ColumnDefinition Width="*"/>         </Grid.ColumnDefinitions>         <Button Name="MefTestBtn" Content="MefTestBtn" Background="LightCoral" FontSize="45"/>     </Grid> </UserControl> 

DisplayRootViewFor<StartViewModel>();//显示界面 

DisplayRootViewFor<IShell>();//显示界面 

using Caliburn.Micro; using MefTest; using System; using System.Collections.Generic; using System.ComponentModel.Composition; using System.ComponentModel.Composition.Hosting; using System.ComponentModel.Composition.Primitives; using System.IO; using System.Linq; using System.Reflection; using System.Text; using System.Windows;  namespace CaliburnTest {     class MyBootstrapper : BootstrapperBase     {          public MyBootstrapper()         {             Initialize();//初始化框架         }          //容器，装东西用的。具体装什么先不管。         CompositionContainer container;          //[Import]         //public MefTestParts mefTestParts { get; set; }         protected override void OnStartup(object sender, StartupEventArgs e)         {             DisplayRootViewFor<StartViewModel>();//显示界面         }         //private IDialogManager dialogManager = PlatformIoC.Get<IDialogManager>();         //[Import(typeof(ContainerTest))]         //public ContainerTest ts { get; set; }         /// <summary>         /// 方法1         /// </summary>         protected void Configure0()         {             var envirmentPath = System.IO.Directory.GetCurrentDirectory();             //AssemblyCatalog 目录的一种，表示在程序集中搜索             var assemblyCatalog = new AssemblyCatalog(typeof(StartViewModel).Assembly);//此处这一句实际上没啥用,因为此程序集下没有任何我们需要的实例(各种handler)                                                                                        //在某个目录下的dll中搜索。                                                                                        //var directoryCatalog = new DirectoryCatalog(@"C:Program Files (x86)YWTKTOOLSPLUGIN-LIBSMISCI12", "*.dll");             var directoryCatalog = new DirectoryCatalog(envirmentPath, @"ContainerDLL.dll");              var aggregateCatalog = new AggregateCatalog(assemblyCatalog, directoryCatalog);              //创建搜索到的部件,放到容器中。             container = new CompositionContainer(aggregateCatalog);              var batch = new CompositionBatch();      //如果还有自己的部件都加在这个地方             batch.AddExportedValue<IWindowManager>(new WindowManager());             batch.AddExportedValue<IEventAggregator>(new EventAggregator());             batch.AddExportedValue(container);              this.container.Compose(batch);          }         /// <summary>         /// 方法2         /// </summary>         protected override void Configure()         {             var envirmentPath = System.IO.Directory.GetCurrentDirectory();              AssemblySource.Instance.Add(Assembly.LoadFile(Path.Combine(envirmentPath, @"MefTest.dll")));             //AssemblySource.Instance.Add(Assembly.LoadFile(Path.Combine(envirmentPath, @"PluginTest.dll")));             var catalog = new AggregateCatalog(                 AssemblySource.Instance.Select(x => new AssemblyCatalog(x)).OfType<ComposablePartCatalog>());             this.container = new CompositionContainer(catalog);              var batch = new CompositionBatch();      //如果还有自己的部件都加在这个地方             batch.AddExportedValue<IWindowManager>(new WindowManager());             batch.AddExportedValue<IEventAggregator>(new EventAggregator());             batch.AddExportedValue(this.container);              this.container.Compose(batch);          }          protected override object GetInstance(Type service, string key)         {             if (service == null)             {                 return null;             }             string contract = string.IsNullOrEmpty(key) ? AttributedModelServices.GetContractName(service) : key;             var exports = container.GetExportedValues<object>(contract);             if (exports.Any())             {                 return exports.First();             }             throw new Exception(string.Format("Could not locate any instances of contract {0}.", contract));         }          protected override IEnumerable<object> GetAllInstances(Type service)         {             return container.GetExportedValues<object>(AttributedModelServices.GetContractName(service));         }         protected override void BuildUp(object instance)         {             container.SatisfyImportsOnce(instance);         }          protected override void OnExit(object sender, EventArgs e)         {             base.OnExit(sender, e);             this.Application.Shutdown();         }      }   } 

 <TabItem x:Name="Up5" Header="MefTest" >                 <ContentControl cal:View.Model="{Binding MefTestView}"/>             </TabItem> 

public MefTestViewModel MefTestView  { get;set;} 

 MefTestView = IoC.Get<MefTestViewModel>();