如何在c＃中参数化定时器的已用事件参数 [英] How to parametrize a timer's elapsed event args in c#

问题描述

你好，



我想参数化一个计时器的已用事件args。我使用以下代码实现了它

引用：

定时器t =新的定时器（）;

t.Elapsed + =（发送者，e）=> elapse（发件人，e，Rahul）;

t.Interval = 1000;

t.Start（）;

我怀疑是：

Quote：

t.Elapsed + =（sender，e）=> elapse（发件人，e，Rahul）;

- 在上面的行中，编译器如何处理这个问题？我的意思是它是一个参数化的委托，因为这是一个lambda表达式。

- 编译器如何确定sender是object类型的变量，而e的类型是

ElapsedEventArgs？



- 以下是经过的事件处理程序代码：

  public   static   void  elapse（ object  sender，ElapsedEventArgs e， string  s）
 {
 Console.WriteLine（ 已过去：{0}，s）; 
 
} 

- 这对我来说是全新的。< br $>


谢谢，

Rahul

解决方案

试着从中了解

  class 计划
 {
  public   delegate   int  MyDelegate（ int  a）; 
 
 静态  void  Main（ string  [] args）
 {
  //  公共事件ElapsedEventHandler Elapsed;  
  //   public delegate void ElapsedEventHandler（object sender，ElapsedEventArgs e）;  
  //   Elapsed是委托ElapsedEventHandler的事件处理程序 
  //  所以我们得出结论，Elapsed是委托 
  //  我们可以为代理使用lamda表达式 
  //  委托是一种表示具有特定参数的方法的引用的类型ter list和return type  
  //  简而言之，方法的签名（返回类型和参数） 
 
 MyDelegate m =（k）= > 增量（k）; 
  var   value  = m.Invoke（ 23 ）; 
} 
 
  public   static   int  Increament（ int  a）
 { return  a ++; } 
} 

如果您了解代表这对您来说很容易..



浏览这些链接

http：// msdn。 microsoft.com/en-us/library/ms173171.aspx [ ^ ]

了解代理人C＃ [ ^ ]

http://msdn.microsoft.com/en-us/library /bb397687.aspx [ ^ ]

http://msdn.microsoft。 COM / EN-US /库/ ORM-978 0596516109-03-09.aspx [ ^ ]

http：// msdn .microsoft.com / zh-CN / library / 0yw3tz5k.aspx [ ^ ]

C＃代理，匿名方法和Lambda表达式 - 我的！ [ ^ ]

Hello,

I wanted to parametrize a timer's elapsed event args. I achieved it using the following code

Quote:

Timer t = new Timer();
t.Elapsed += (sender, e) => elapse(sender, e, "Rahul");
t.Interval = 1000;
t.Start();

My doubt is :

Quote:

t.Elapsed += (sender, e) => elapse(sender, e, "Rahul");

- In the above line how does the compiler treat this? i mean is it a parametrized delegate because this is a lambda expression.
- How does the compiler decide that "sender" is a variable of type "object", and "e" is of type
"ElapsedEventArgs"?

- Below is the elapsed event handler code:

public static void elapse(object sender,ElapsedEventArgs e,string s)
      {
          Console.WriteLine("elapsed with :{0}",s);

      }

- This was something completely new to me.

Thanks,
Rahul

解决方案

try to understand from this

class Program
{
    public delegate int MyDelegate(int a);

    static void Main(string[] args)
    {
        //  public event ElapsedEventHandler Elapsed;
        //public delegate void ElapsedEventHandler(object sender, ElapsedEventArgs e);
        // Elapsed is an event handler of delegate ElapsedEventHandler
        // so we conclude that Elapsed is delegate
        // we can use lamda expression for delegates
        //A delegate is a type that represents references to methods with a particular parameter list and return type
        // in short , signature of the method ( return type and parameters )

        MyDelegate m = (k) => Increament(k);
       var value =  m.Invoke(23);
    }

    public static int Increament(int a)
    { return a++; }
}

if you understand delegates this is easy for you..

go through these links
http://msdn.microsoft.com/en-us/library/ms173171.aspx[^]
Understanding Delegates in C#[^]
http://msdn.microsoft.com/en-us/library/bb397687.aspx[^]
http://msdn.microsoft.com/en-us/library/orm-9780596516109-03-09.aspx[^]
http://msdn.microsoft.com/en-us/library/0yw3tz5k.aspx[^]
C# Delegates, Anonymous Methods, and Lambda Expressions – O My![^]

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