C#事件示例程序
using System;
using System.Collections.Generic;
using System.Text;
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namespace MyCalculate {
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public delegate void CalculateEventHandler(object sender,EventArgs e);
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class CalculateWithEvent {
public event CalculateEventHandler Calculate;
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protected virtual void OnCalculate(EventArgs e) {
if (Calculate != null) {
Calculate(this, e);
}
}
public int Add(int a, int b) {
OnCalculate(EventArgs.Empty);
return a + b;
}
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public int Sub(int a, int b) {
OnCalculate(EventArgs.Empty);
return a - b;
}
}
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class EventListener {
private CalculateWithEvent CalculateCase;
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public EventListener(CalculateWithEvent calculateCase){
CalculateCase = calculateCase;
CalculateCase.Calculate += new CalculateEventHandler(CalculateCase_Calculate);
}
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void CalculateCase_Calculate(object sender, EventArgs e)
{
//throw new Exception("The method or operation is not implemented.");
Console.WriteLine("运算事件被调用!");
}
}
}
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namespace TestNS
{
using MyCalculate;
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class Test
{
static void Main(string[] args)
{
CalculateWithEvent myCalculate = new CalculateWithEvent();
EventListener myListener = new EventListener(myCalculate);
myCalculate.Add(2, 3);
myCalculate.Sub(3, 2);
}
}
}
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虚拟的,用于在基类定义一个方法,以便在继承类中重写方法(override)