c#事件 的三种使用方式
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使用delegate 关键字定义事件的委托public delegate void Notify();public event Notify ProcessCompeleted;
public class EventSample
{
public delegate void Notify();
public event Notify ProcessCompeleted;
public void Start()
{
Console.WriteLine("开始作业");
//业务逻辑
//处理完毕后触发事件
OnProcessCompeleted();
}
protected virtual void OnProcessCompeleted()
{
ProcessCompeleted?.Invoke();
//判断是否订阅了
//if (ProcessCompeleted != null)
// ProcessCompeleted();
}
}
class Program
{
static void Main(string[] args)
{
EventSample sample = new EventSample();
sample.ProcessCompeleted += Sample_ProcessCompeleted;
sample.Start();
Console.ReadLine();
}
private static void Sample_ProcessCompeleted()
{
Console.WriteLine("处理完成");
}
}
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版权声明：本文为CSDN博主「一个有料的码农」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/sud423/article/details/123848092
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internal class Program
{
static void Main(string[] args)
{
fabu f = new fabu();
dingyue dy = new dingyue();
f.tEvent += dy.SendMessage;
f.chufa();
Console.ReadLine();
}
}
public class fabu
{
// public delegate void EventHandler(object sender, EventArgs e);
public event EventHandler tEvent;
// 事件的触发函数
public void chufa() {
tEvent(this, null);
}
}
public class dingyue
{
public void SendMessage(Object sender,EventArgs e)
{
Console.WriteLine("订阅了事件");
}
}
}
自定义事件 自定义事件继承 EventArgs方便数据传递 在自定义事件中定义需要传递的数据
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace TestEventArgs
{
public class TestEvent : EventArgs
{
public int count { set; get; }
}
//事件发布者
public class CountArgs
{
public event EventHandler<TestEvent> CountDo;
//触发事件
public void DoCount()
{
TestEvent te = new TestEvent();
for (int i = 0; i < 10; i++)
{
if(i%5 ==0)
{
te.count += i;
CountDo(this,te);
}
}
}
}
//事件的订阅者
public class Coun {
public int count;
public void Count(Object sender, TestEvent e)
{
count = e.count;
Console.WriteLine(count);
}
}
public class Program_ {
static void Main() {
CountArgs ca = new CountArgs();
Coun coun = new Coun();
ca.CountDo += coun.Count;
ca.DoCount(); // 触发事件
Console.ReadLine();
}
}
}
