AvalonDock 2.0+Caliburn.Micro+MahApps.Metro实现Metro风格插件式系统（一）

 public class MefBootstrapper : Bootstrapper<IShell>
    {
        private CompositionContainer container;

        protected override void Configure()
        {
            /*CompositionContainer 对象在应用程序中有两种的主要用途。首先，它跟踪哪些部分可用于组合、它们的依赖项，并且充当任何指定组合的上下文。其次，它提供了应用程序可以启动组合的方法、获取组合部件的实例，或填充可组合部件的依存关系。
            部件可直接用于容器，或通过 Catalog 属性来用于容器。在此 ComposablePartCatalog 中可发现的所有部件都可以供容器来满足导入，还包括直接添加的任何部件。*/ 
            container = new CompositionContainer(
                new AggregateCatalog(AssemblySource.Instance.Select(x => new AssemblyCatalog(x)))
                );

            var batch = new CompositionBatch();
            var dockScreenManager = new DockScreenManager();
            batch.AddExportedValue<IWindowManager>(new WindowManager());//將指定的导出加入至 CompositionBatch 物件
            batch.AddExportedValue<IDockScreenManager>(dockScreenManager);
            batch.AddExportedValue<IEventAggregator>(new EventAggregator());
            batch.AddExportedValue(container);

            container.Compose(batch);//在容器上执行组合，包括指定的 CompositionBatch 中的更改
        }

        protected override object GetInstance(Type serviceType, string key)
        {
            var contract = string.IsNullOrEmpty(key) ? AttributedModelServices.GetContractName(serviceType) : key;//获取指定类型的规范协定名称
            var exports = container.GetExportedValues<object>(contract);//返回具有从指定的类型参数派生的协定名称的已导出对象。如果不是正好有一个匹配的已导出对象，则将引发异常。

            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 serviceType)
        {
            return container.GetExportedValues<object>(AttributedModelServices.GetContractName(serviceType));
        }

        protected override void BuildUp(object instance)
        {
            container.SatisfyImportsOnce(instance);//满足指定的 ComposablePart 对象的导入，而无需注册该对象以进行重新组合。
        }
    }

<Application x:Class="DemoApplication.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:DemoApplication"
             >
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary>
                    <local:MefBootstrapper x:Key="bootstrapper" />
                </ResourceDictionary>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>
</Application>

  public interface IShell
    {
    
    }

<MetrolControls:MetroWindow x:Class="DemoApplication.ShellView"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:MetrolControls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
        Title="ShellView" Height="500" Width="800">
    <Window.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Colours.xaml"/>
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Fonts.xaml"/>
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml"/>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Window.Resources>
    <Grid>
        <ContentControl  x:Name="DockContent" Margin="0,2,0,0" Grid.Row="0"/>
    </Grid>
</MetrolControls:MetroWindow>

 [Export(typeof(IShell))]
    class ShellViewModel:IShell
    {
        [Import]
        public IScreen DockContent { get; set; }
    }

<UserControl x:Class="DemoApplication.Views.DockView"
             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" 
             mc:Ignorable="d" 
             xmlns:avalonDock="http://avalondock.codeplex.com"
             d:DesignHeight="300" d:DesignWidth="800">
    <UserControl.Resources>
        <avalonDock:BoolToVisibilityConverter x:Key="BoolToVisibilityConverter"/>
    </UserControl.Resources>
    <Grid>
        <Grid x:Name="layoutRoot">
            <avalonDock:DockingManager  Grid.Row="1" x:Name="dockManager"  AllowMixedOrientation="True"  >
                <avalonDock:DockingManager.Theme>
                    <avalonDock:MetroTheme/>
                </avalonDock:DockingManager.Theme>
                <avalonDock:DockingManager.LayoutItemTemplate>
                    <DataTemplate>
                        <ContentControl IsTabStop="False" />
                    </DataTemplate>
                </avalonDock:DockingManager.LayoutItemTemplate>
                <avalonDock:LayoutRoot>
                    <avalonDock:LayoutPanel  Orientation="Horizontal"  >
                        <avalonDock:LayoutAnchorablePaneGroup DockWidth="200"    Orientation="Vertical"  >
                            <avalonDock:LayoutAnchorablePane  >
                                <avalonDock:LayoutAnchorable Title="left" ></avalonDock:LayoutAnchorable>
                            </avalonDock:LayoutAnchorablePane>
                        </avalonDock:LayoutAnchorablePaneGroup>
                        <avalonDock:LayoutPanel  Orientation="Vertical"  >
                            <avalonDock:LayoutDocumentPaneGroup Orientation="Horizontal">
                                <avalonDock:LayoutDocumentPane   >
                                    <avalonDock:LayoutDocument Title="main"></avalonDock:LayoutDocument>
                                </avalonDock:LayoutDocumentPane>

                            </avalonDock:LayoutDocumentPaneGroup>
                            <avalonDock:LayoutAnchorablePaneGroup DockHeight="100"   Orientation="Horizontal"  >
                                <avalonDock:LayoutAnchorablePane  >
                                    <avalonDock:LayoutAnchorable Title="bottom" ></avalonDock:LayoutAnchorable>
                                </avalonDock:LayoutAnchorablePane>
                            </avalonDock:LayoutAnchorablePaneGroup>
                        </avalonDock:LayoutPanel>
                        <avalonDock:LayoutAnchorablePaneGroup DockWidth="200"    Orientation="Horizontal"  >
                            <avalonDock:LayoutAnchorablePane >
                                <avalonDock:LayoutAnchorable Title="Right" ></avalonDock:LayoutAnchorable>
                            </avalonDock:LayoutAnchorablePane>
                        </avalonDock:LayoutAnchorablePaneGroup>
                    </avalonDock:LayoutPanel>

                </avalonDock:LayoutRoot>
            </avalonDock:DockingManager>
        </Grid>
    </Grid>
</UserControl>

    [Export(typeof(IScreen))]
    public class DockViewModel : Screen
    {

    }