C#开发中如何处理消息传递和事件驱动编程

public delegate void MessageHandler(string message);

public class Receiver
{
    public void HandleMessage(string message)
    {
        Console.WriteLine("Received message: " + message);
    }
}

public class Sender
{
    public event MessageHandler MessageReceived;

    public void SendMessage(string message)
    {
        if (MessageReceived != null)
            MessageReceived(message);
    }
}

class Program
{
    static void Main(string[] args)
    {
        Receiver receiver = new Receiver();
        Sender sender = new Sender();

        sender.MessageReceived += receiver.HandleMessage;

        sender.SendMessage("Hello, world!");
    }
}

public class Receiver
{
    public void HandleMessage(object sender, MessageEventArgs e)
    {
        Console.WriteLine("Received message: " + e.Message);
    }
}

public class Sender
{
    public event EventHandler<MessageEventArgs> MessageReceived;

    public void SendMessage(string message)
    {
        if (MessageReceived != null)
            MessageReceived(this, new MessageEventArgs(message));
    }
}

public class MessageEventArgs : EventArgs
{
    public string Message { get; private set; }

    public MessageEventArgs(string message)
    {
        Message = message;
    }
}

class Program
{
    static void Main(string[] args)
    {
        Receiver receiver = new Receiver();
        Sender sender = new Sender();

        sender.MessageReceived += receiver.HandleMessage;

        sender.SendMessage("Hello, world!");
    }
}

public class Button
{
    public event EventHandler Click;

    public void OnClick()
    {
        if (Click != null)
            Click(this, EventArgs.Empty);
    }
}

public class MessageDialog
{
    public void ShowMessage(object sender, EventArgs e)
    {
        Console.WriteLine("Button clicked!");
    }
}

class Program
{
    static void Main(string[] args)
    {
        Button button = new Button();
        MessageDialog dialog = new MessageDialog();

        button.Click += dialog.ShowMessage;

        button.OnClick();
    }
}