Question

If a class declares a event then event can be fired only from that class. what is the reason for the restriction of the event invocation?

using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication12
{
    delegate void Function();

    class EventHandling
    {
        public event Function fun;

        public void AddEvents(Function events)
        {
            fun += events;
        }

        public void Notify()
        {
            fun();
        }
    }

    class Program
    {

        static void Main(string[] args)
        {
            EventHandling aEvtHandler = new EventHandling();
            Function aFun = new Function(Display);
            aEvtHandler.AddEvents(aFun);
            aEvtHandler.Notify();
        }

        static void Display()
        {
            Console.WriteLine("in the display");
            Console.Read();
        }
    }
}

Answer 1

Firing an event only makes sense from the class that defined it.

如果我创立了“Bike”类,该类含有“发动机”活动,那次事件是何时发生的? 当发生使发动机开始的情况时。因此,所发射的事件意味着,该类(Bike物体)的事例向外部世界报告,发动机已经开始。

另外一个目标向世界报告,某个双 bi的发动机开始,而没有双ke公司自己报告。

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