How to follow a publisher/subscriber strategy in C# or .NET?

What is the most suitable language construct in C# or class or function in .NET's BCL to follow a publisher/subscr开发者_高级运维iber (aka. signals/slots) strategy?

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Events in C# and VB are the typical language construct for handling pub/sub:

public class Publisher
{
    public event EventHandler MyEvent;

    private void RaiseEvent()
    {
        EventHandler handler = MyEvent;
        if (handler != null)
        {
            handler(this, EventArgs.Empty);
        }
    }
}

public class Subscriber
{
    public void Subscribe(Publisher pub)
    {
        pub.MyEvent += MethodToCall;
    }

    private void MethodToCall(object sender, EventArgs e)
    {
        // This will be called from Publisher.RaiseEvent
    }
}

Alternatives include Reactive Extensions and WPF Commanding.

Note that if the Publisher is long-lived but the Subscriber should be short-lived, the Subscriber will need to unsubscribe from the event - otherwise the Publisher will maintain a reference to the Subscriber due to the event, preventing garbage collection.

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This Microsoft article may also be useful in that it describes how the Observer design pattern can be implemented using .NET: http://msdn.microsoft.com/en-us/library/ff648108.aspx