向.net事件添加参数

public class CustomEventArgs : EventArgs
{
    public string Message { get; set; }

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

public class EventPublisher
{
    public event EventHandler<CustomEventArgs> CustomEvent;

    public void PublishEvent(string message)
    {
        OnCustomEvent(new CustomEventArgs(message));
    }

    protected virtual void OnCustomEvent(CustomEventArgs e)
    {
        CustomEvent?.Invoke(this, e);
    }
}

public class EventSubscriber
{
    public void HandleCustomEvent(object sender, CustomEventArgs e)
    {
        Console.WriteLine("Received message: " + e.Message);
    }
}

EventPublisher publisher = new EventPublisher();
EventSubscriber subscriber = new EventSubscriber();

publisher.CustomEvent += subscriber.HandleCustomEvent;

publisher.PublishEvent("Hello, world!");