C# 中的事件数组

C#中的事件数组：深入了解事件驱动编程

csharp
using System;
// 定义事件委托
public delegate void MyEventHandler(object sender, EventArgs e);
class EventPublisher
{
    // 声明事件数组
    public event MyEventHandler[] MyEvent;
    // 触发事件的方法
    public void RaiseEvent()
    {
        // 检查事件是否有订阅者
        if (MyEvent != null)
        {
            // 触发事件数组中的所有事件
            foreach (var handler in MyEvent)
            {
                handler?.Invoke(this, EventArgs.Empty);
            }
        }
    }
}
class EventSubscriber
{
    // 事件处理方法
    public void HandleEvent(object sender, EventArgs e)
    {
        Console.WriteLine("Event handled by EventSubscriber");
    }
}

csharp
class Program
{
    static void Main()
    {
        EventPublisher publisher = new EventPublisher();
        EventSubscriber subscriber1 = new EventSubscriber();
        EventSubscriber subscriber2 = new EventSubscriber();
        // 订阅事件
        publisher.MyEvent += new MyEventHandler(subscriber1.HandleEvent);
        publisher.MyEvent += new MyEventHandler(subscriber2.HandleEvent);
        // 触发事件
        publisher.RaiseEvent();
        // 移除一个事件处理程序
        publisher.MyEvent -= new MyEventHandler(subscriber1.HandleEvent);
        // 再次触发事件，只有 subscriber2 会响应
        publisher.RaiseEvent();
        Console.ReadKey();
    }
}