场景： 假设你是一家婚礼策划公司的组织者，你需要安排婚礼的各个方面，如音乐、鲜花、照片等。
事件的用法： 你创建了一个婚礼策划事件，并邀请了音乐师、花店、摄影师等作为订阅者。当婚礼日期临近时，你触发婚礼策划事件，所有订阅者会按照自己的职责做好准备。

using System ;
public class WeddingPlanner
{public event EventHandler WeddingPlanningEvent;public void PlanWedding(){// 策划婚礼的各个方面...// 触发婚礼策划事件WeddingPlanningEvent?.Invoke(this, EventArgs.Empty);//WeddingPlanningEvent 是一个 EventHandler 类型的事件，它的委托要求传递两个参数，//	即事件的源（this，表示 WeddingPlanner 实例）和事件参数（空的 EventArgs 实例）}
}public class Musician
{public void PlayMusic(object sender, EventArgs e){Console.WriteLine("Musician: Playing romantic music");}
}public class Florist
{public void ArrangeFlowers(object sender, EventArgs e){Console.WriteLine("Florist: Arranging beautiful flowers");}
}public class Photographer
{public void CaptureMoments(object sender, EventArgs e){Console.WriteLine("Photographer: Capturing precious moments");}
}class Program
{static void Main(){WeddingPlanner planner = new WeddingPlanner();Musician musician = new Musician();Florist florist = new Florist();Photographer photographer = new Photographer();// 订阅婚礼策划事件planner.WeddingPlanningEvent += musician.PlayMusic;planner.WeddingPlanningEvent += florist.ArrangeFlowers;planner.WeddingPlanningEvent += photographer.CaptureMoments;// 策划婚礼planner.PlanWedding();Console.ReadLine();}
}

Musician: Playing romantic music
Florist: Arranging beautiful flowers
Photographer: Capturing precious moments

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