C# 具有多个相互依存部件的MEF组合
设计基于MEF的插件体系结构的最佳方法是什么,它在插件之间具有依赖关系?例如:C# 具有多个相互依存部件的MEF组合,c#,inversion-of-control,mef,C#,Inversion Of Control,Mef,设计基于MEF的插件体系结构的最佳方法是什么,它在插件之间具有依赖关系?例如: class MainForm { CompositionContainer container; [ImportMany] IEnumerable<Lazy<IWindow>> windows; public MainForm() { this.container = new CompositionContainer(new As
class MainForm
{
CompositionContainer container;
[ImportMany]
IEnumerable<Lazy<IWindow>> windows;
public MainForm()
{
this.container = new CompositionContainer(new AssemblyCatalog(Assembly.GetExecutingAssembly()));
this.container.ComposeParts(this);
}
public void DoSomething()
{
foreach (var winPart in windows)
{
Debug.WriteLine(winPart.Value.Name);
}
}
}
interface IWindow
{
string Name { get; }
}
delegate void AnEvent(object sender, EventArgs e);
interface IEventManager
{
event AnEvent AnEvent;
void OnAnEvent(object sender, EventArgs eventArgs);
}
[Export(typeof(IEventManager))]
class EventManager : IEventManager
{
public event AnEvent AnEvent = delegate { };
public void OnAnEvent(object sender, EventArgs eventArgs) { AnEvent(sender, eventArgs); }
}
[Export(typeof(IWindow))]
class Window1 : IWindow
{
[Import]
IEventManager eventMgr;
public Window1() { }
public string Name
{
get
{
eventMgr.OnAnEvent(this, new EventArgs());
return "Window1";
}
}
}
[Export(typeof(IWindow))]
class Window2 : IWindow
{
[Import]
IEventManager eventMgr;
public Window2() { this.eventMgr.AnEvent += eventMgr_AnEvent; }
void eventMgr_AnEvent(object sender, EventArgs e)
{
Debug.WriteLine("Event from Window 2");
}
public string Name { get { return "Window2"; } }
}
class主窗体
{
复合容器;
[进口数量]
i数不清的窗户;
公共表格(
{
this.container=新的CompositionContainer(新的AssemblyCatalog(Assembly.getExecutionGassembly());
this.container.ComposeParts(this);
}
公共无效剂量测定法()
{
foreach(windows中的var winPart)
{
Debug.WriteLine(winPart.Value.Name);
}
}
}
接口IWindow
{
字符串名称{get;}
}
委托void AnEvent(对象发送者,事件参数e);
接口IEventManager
{
事件事件;
void OnAnEvent(对象发送方,EventArgs EventArgs);
}
[导出(类型(IEventManager))]
类EventManager:IEventManager
{
公共事件AnEvent AnEvent=委托{};
OnAnEvent(对象发送方,EventArgs EventArgs){AnEvent(发送方,EventArgs);}
}
[导出(类型(IWindow))]
类Window1:IWindow
{
[进口]
IEventManager事件管理器;
公共窗口1(){}
公共字符串名
{
得到
{
eventMgr.OnAnEvent(这是新的EventArgs());
返回“Window1”;
}
}
}
[导出(类型(IWindow))]
类Window2:IWindow
{
[进口]
IEventManager事件管理器;
public Window2(){this.eventMgr.AnEvent+=eventMgr_AnEvent;}
void eventMgr\u AnEvent(对象发送方,事件参数e)
{
Debug.WriteLine(“来自窗口2的事件”);
}
公共字符串名称{get{return“Window2”;}
}
在
窗口2
构造函数中,此.eventMgr
为空。我希望它是由MainForm编写的。一种方法是使用多个CompositionContainers
,但如果这样做,则会有两个EventManager
实例,而不是一个共享实例。做这件事的最佳方法是什么?在进一步探讨这个问题时,完全允许相互依赖。关键是将目录中可用的部件传递给用于组合零件的CompositionContainer。然后,以下代码有助于允许一个插件访问另一个插件:
[Export(typeof(IWindow))]
class Window2 : IWindow
{
IEventManager eventMgr;
[ImportingConstructor]
public Window2([Import(typeof(IEventManager))]IEventManager mgr)
{
this.eventMgr.AnEvent += eventMgr_AnEvent;
}
void eventMgr_AnEvent(object sender, EventArgs e)
{
Debug.WriteLine("Event from Window 2");
}
public string Name { get { return "Window2"; } }
}