本文试图在.net Framework环境下,使用C#语言来描述委托、事件的概貌。希望本文能有助于大家理解委托、事件的概念,理解委托、事件的用途,理解它的C#实现方法,理解委托与事件为我们带来的好处。C#是一种新的语言,希望大家能通过本文清楚地看到这些,从而可以对委托、事件等技术进行更深入的理解和探索。
一. 委托
委托的本质
--在C#中,委托是一个特殊的类;
--在某种程度上,相当于C++的函数指针;
--在某种程度上,相当于接口(Interface);
委托的定义
--关键字:delegate
--public delegate void MyDelegate(string message);
注:在这里我们先了解一个概念,什么是函数签名?(在这里我不做过多解释,大家知道这个概念就行)。
使用委托
我们先来看看一个小的委托示例:
平时,如果说我们要设计一个做简单加减运算的方法,通常是怎么做的呢?看看下面代码:
1
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
class Program
2
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydFRkR0Z5ZEM1bmFXWT0uanBn.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
3
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBOdmJuUnlZV04wWldSVGRXSkNiRzlqYXk1bmFXWT0uanBn.jpg?w=700&webp=1)
/**//// <summary>
4
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
/// 加法运算
5
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
/// </summary>
6
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
/// <param name="x">x</param>
7
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
/// <param name="y">y</param>
8
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
/// <returns></returns>
9
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
private static int Add(int x, int y)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
int result = x + y;
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
Console.WriteLine("x + y = {0}",result);
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
return result;
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBOdmJuUnlZV04wWldSVGRXSkNiRzlqYXk1bmFXWT0uanBn.jpg?w=700&webp=1)
/**//// <summary>
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
/// 减法运算
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
/// </summary>
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
/// <param name="x">x</param>
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
/// <param name="y">y</param>
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
/// <returns></returns>
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
private static int Sub(int x, int y)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
int result = x - y;
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
Console.WriteLine("x - y = {0}", result);
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
return result;
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
static void Main(string[] args)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
);
);
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
Console.Read();
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydEZibVF1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
}
上面的代码只要是学过程序的人都能看懂,也写得出,不过我们怎么通过委托来处理+,-运算呢?请看下面定义:
1
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
namespace DelegateSample1
2
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydFRkR0Z5ZEM1bmFXWT0uanBn.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBOdmJuUnlZV04wWldSQ2JHOWpheTVuYVdZPS5qcGc%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
3
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
//定义一委托
4
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
public delegate int OperationDelegate(int x,int y);
5
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
public class Operator
6
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
7
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
private int _x, _y;
8
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
public Operator(int x, int y)
9
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
this._x = x;
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
this._y = y;
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
public void Operate(OperationDelegate del)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
del(_x, _y);
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydEZibVF1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
}
上面定义一个返回int类型需要两个int参数的委托。Operator里提供了一个操作方法带有一个委托参数。那通过委托怎么来处理这个简单的运算呢?好,现在我们来修改我们之前定义的主方法,如下:
1
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
namespace DelegateSample1
2
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydFRkR0Z5ZEM1bmFXWT0uanBn.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBOdmJuUnlZV04wWldSQ2JHOWpheTVuYVdZPS5qcGc%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
3
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
class Program
4
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
5
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBOdmJuUnlZV04wWldSVGRXSkNiRzlqYXk1bmFXWT0uanBn.jpg?w=700&webp=1)
/**//// <summary>
6
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
/// 加法运算
7
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
/// </summary>
8
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
/// <param name="x">x</param>
9
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
/// <param name="y">y</param>
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
/// <returns></returns>
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
private static int Add(int x, int y)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
int result = x + y;
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
Console.WriteLine("x + y = {0}",result);
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
return result;
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBOdmJuUnlZV04wWldSVGRXSkNiRzlqYXk1bmFXWT0uanBn.jpg?w=700&webp=1)
/**//// <summary>
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
/// 减法运算
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
/// </summary>
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
/// <param name="x">x</param>
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
/// <param name="y">y</param>
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
/// <returns></returns>
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
private static int Sub(int x, int y)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
int result = x - y;
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
Console.WriteLine("x - y = {0}", result);
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
return result;
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
static void Main(string[] args)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
//声明一个委托对象
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
OperationDelegate del = null;
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
del += new OperationDelegate(Add);
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
del += new OperationDelegate(Sub);
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
);
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
op.Operate(del);
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
Console.ReadLine();
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydEZibVF1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
}
从上面的例子看,委托OperationDelegate代表了一组方法,他们的方法签名是:
--返回值:int; 参数:int ,int ;
只要符合该签名的方法,都可以赋给此委托:从上面不难看出,我要要创建一委托,则如下定义:
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
OperationDelegate del += new OperationDelegate(方法名);
从上面可以看到(+=)这个运算符,那是不是也有(-=)这个运算符呢?这就涉及到另外一个概念了--委托链。
--委托链:实际上委托实例就是一个委托链,+=代表增加委托实例到委托链中,相反-=则代表去掉该委托实例。
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
OperationDelegate del = null;
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
del += new OperationDelegate(Add); //增加委托实例到委托链
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
del -= new OperationDelegate(Add); //去掉委托实例到
委托的意义之一
--委托可以使得程序的复用程度提高;
--委托在一定程度上想当于接口;
例如:前面例子中的方法Operate(),由于接受的是一个委托类型;那么,我们可以对委托类型赋予不同的方法,来改变Operate()的性质。
我们在来看看另外一个示例:
--我们想输出一串数字,从0-100;
--对于输出的要求有三种;
-1、输出到控制台
-2、输出到窗体中的ListBox中;
-3、输出到文本文件中;
解决方案:
--使用委托和接口, 代码如下:
1
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
namespace DelegateSample2
2
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydFRkR0Z5ZEM1bmFXWT0uanBn.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBOdmJuUnlZV04wWldSQ2JHOWpheTVuYVdZPS5qcGc%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
3
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
//定义一委托
4
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
public delegate void ShowNumberDel(object[] items);
5
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
public class ProcessNumber
6
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
7
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
private object[] items;
8
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
public ProcessNumber(int max)
9
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
items = new object[max];
; i < max; ++i)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
items[i] = i;
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
public void ProcessItems(ShowNumberDel show)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
show(items);
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydEZibVF1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
}
在这里我们先把界面上的控件布局好并做好调用委托的准备工作,效果及代码如下:
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmFXMWhaMlZ6TG1OdVlteHZaM011WTI5dEwyTnVZbXh2WjNOZlkyOXRMMkpsYm1saGJ5OWtaV3hsWjJGMFpWVnBMbXB3Wnc9PS5qcGc%3D.jpg?w=700&webp=1)
代码如下:
1
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
private ProcessNumber pn = null;
2
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
ShowNumberDel del = null;
3
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
4
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
private void Form1_Load(object sender, EventArgs e)
5
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydFRkR0Z5ZEM1bmFXWT0uanBn.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBOdmJuUnlZV04wWldSQ2JHOWpheTVuYVdZPS5qcGc%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
);
7
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydEZibVF1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
}
8
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
9
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
//到控制台
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
private void ShowInConsole(object[] items)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydFRkR0Z5ZEM1bmFXWT0uanBn.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBOdmJuUnlZV04wWldSQ2JHOWpheTVuYVdZPS5qcGc%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
foreach (object item in items)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
Console.WriteLine(item);
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydEZibVF1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
//到ListBox
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
private void ShowInListBox(object[] items)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydFRkR0Z5ZEM1bmFXWT0uanBn.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBOdmJuUnlZV04wWldSQ2JHOWpheTVuYVdZPS5qcGc%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
listBox1.Items.Clear();
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
foreach (object item in items)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
listBox1.Items.Add(item);
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydEZibVF1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
//到文本文件
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
private void ShowInFile(object[] items)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydFRkR0Z5ZEM1bmFXWT0uanBn.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBOdmJuUnlZV04wWldSQ2JHOWpheTVuYVdZPS5qcGc%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
using (StreamWriter sw = new StreamWriter("Test.txt", true))
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
foreach (object item in items)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRUZEdGeWRDNW5hV1k9LmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
sw.WriteLine(item);
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrVTNWaVFteHZZMnRGYm1RdVoybG0uanBn.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydEZibVF1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
}
使用委托:
1
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
private void button1_Click(object sender, EventArgs e)
2
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydFRkR0Z5ZEM1bmFXWT0uanBn.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBOdmJuUnlZV04wWldSQ2JHOWpheTVuYVdZPS5qcGc%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
3
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
pn.ProcessItems(new ShowNumberDel(ShowInConsole));
4
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydEZibVF1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
}
5
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
6
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
private void button2_Click(object sender, EventArgs e)
7
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydFRkR0Z5ZEM1bmFXWT0uanBn.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBOdmJuUnlZV04wWldSQ2JHOWpheTVuYVdZPS5qcGc%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
8
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
pn.ProcessItems(new ShowNumberDel(ShowInListBox));
9
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydEZibVF1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
private void button3_Click(object sender, EventArgs e)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydFRkR0Z5ZEM1bmFXWT0uanBn.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBOdmJuUnlZV04wWldSQ2JHOWpheTVuYVdZPS5qcGc%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
pn.ProcessItems(new ShowNumberDel(ShowInFile));
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydEZibVF1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
}
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDA1dmJtVXVaMmxtLmpwZw%3D%3D.jpg?w=700&webp=1)
private void button4_Click(object sender, EventArgs e)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydFRkR0Z5ZEM1bmFXWT0uanBn.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBOdmJuUnlZV04wWldSQ2JHOWpheTVuYVdZPS5qcGc%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlrYjNRdVoybG0uanBn.jpg?w=700&webp=1)
{
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
del += new ShowNumberDel(this.ShowInListBox);
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
del += new ShowNumberDel(this.ShowInFile);
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBsdVFteHZZMnN1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
pn.ProcessItems(del);
![C#编程之委托与事件四(一)【转】 C#编程之委托与事件四(一)【转】](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhBdmQzZDNMbU51WW14dlozTXVZMjl0TDBsdFlXZGxjeTlQZFhSc2FXNXBibWRKYm1ScFkyRjBiM0p6TDBWNGNHRnVaR1ZrUW14dlkydEZibVF1WjJsbS5qcGc%3D.jpg?w=700&webp=1)
}
完整的测试代码如下:
委托的意义之二
--在C#中使用线程需要用到委托
- Thread thread = new Thread(new ThreadStart(target));
− -这里的ThreadStart就是一个委托,他的定义是:
-target既为符号ThreadStart委托的方法名;
--函数回调
- 当我们定义了一个委托;
public delegate void MyDelegate(int source);
-对于异步调用来说,就有BeginInvoke()和EndInvoke()方法;
-del.BeginInvoke(source, new System.AsyncCallback(CallBack), "test");
-private void CallBack(IAsyncResult asyncResult)
{
int result = del.EndInvoke(asyncResult);
//......
}
这里需要理解的就是什么叫函数回调?这个话题留给大家讨论,在此不作详细解说。关于委托本文只是入门级的文章,要想更详细深入的学习委托请查看具体的书籍或资料,本文就简单介绍到这里。
文中示例代码下载:Delegate.Event.Thread(1).rar