【C#】关于事件的使用ii，eg：{婚礼策划公司的组织者}

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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