【软件设计】【MEF】export

Composable Part exports

[Export]
public class SomeComposablePart {
  ...
}

Property exports

  

  public class Configuration
  {
    [Export("Timeout")]
    public int Timeout
    {
      get { return int.Parse(ConfigurationManager.AppSettings["Timeout"]); }
    }
  }
  [Export]
  public class UsesTimeout
  {
    [Import("Timeout")]
    public int Timeout { get; set; }
  }

Method exports

  

  public class MessageSender
  {
    [Export(typeof(Action<string>))]
    public void Send(string message)
    {
      Console.WriteLine(message);
    }
  }

  [Export]
  public class Processor
  {
    [Import(typeof(Action<string>))]
    public Action<string> MessageSender { get; set; }

    public void Send()
    {
      MessageSender("Processed");
    }
  }

  public class MessageSender
  {
    [Export("MessageSender")]
    public void Send(string message)
    {
      Console.WriteLine(message);
    }
  }

  [Export]
  public class Processor
  {
    [Import("MessageSender")]
    public Action<string> MessageSender { get; set; }

    public void Send()
    {
      MessageSender("Processed");
    }
  }

Inherited Exports

[InheritedExport]
public interface ILogger {
  void Log(string message);
}

public class Logger : ILogger {
  public void Log(string message);
}