学习代表和活动 [英] Learning delegates and events

问题描述

我是C＃的新手，想要在控制台应用程序中创建自己的活动。

但是我在精神上苦苦挣扎，并查看了MSDN

文档，但我得知空白。网上有什么地方

显示一个非常基本的代表和一个非常基本的事件？一些不错的

简单的示例代码就是我正在寻找的，没有任何毛病。


谢谢！


-

Mark Allison，SQL Server MVP
http://www.markallison.co.uk

寻找SQL Server复制书？
http://www.nwsu.com/0974973602m.html

解决方案

我今天肯定会在这两篇文章上发一篇简短的文章，但是在

的同时，我很确定你应该觉得这很有帮助。


委托是一种能够封装方法的类型

签名。代表可以与事件一起使用。活动

是一种通常在班级内宣布的类型。

公共班MyClass

{

/ /指向要调用的方法的委托。在这种情况下，

//方法的返回类型是''void''。

public delegate void MyDelegate（）;

//如果要处理事件的方法

//（本例中为MyMethod）接受参数，则声明

//委托如下

public delegate void MyDelegate（int i）;

//事件类型为MyDelegate

公共事件MyDelegate MyEvent;

public MyClass（）

{

//将事件附加给代表

this.MyEvent + = new MyDelegate（MyMethod）;

}

//这是充当事件过程的方法。

public void MyMethod（）

{

//在此处理活动。

}

}


问候，

JVRavichandran

- http：//www.geocities .com /

jvravichandran

- http://www.411asp.net/func/search？

qry = Ravichandran + JV& cob = aspnetpro

- http://www.southasianoutlook.com

- < a rel =nofollowhref =http://www.MSDNAA.Nettarget =_ blank> http://www.MSDNAA.Net

- http://www.csharphelp.com

- http://www.poetry.com/Publications/

显示。 asp？ID = P3966388& BN = 999& PN = 2

- 或者，只需在
http://www.Google.comtarget =_ blank> http://www.Google.com


***通过Developersdex发送 http://www.developersdex.com ***

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谢谢，


好​​的，让我用自己的话说，然后你可以打我下。 ;-)


您创建一个名为public delegate的委托void MyDelegate（int i） -

此委托使用相同的sig运行代码。很酷，明白了。


然后您按如下方式定义您的活动：

公共活动MyDelegate MyEvent;


我并没有真正理解上面的代码行。那是什么

有效宣告？


当你把事件附加给代表时，你是解雇事件，

举起活动？我希望从另一个班级收听该活动

。我如何让其他班级听这堂课的
活动？


对不起但是你这个非常简单的例子让我更加困惑。

-

Mark Allison，SQL Server MVP
http://www.markallison.co.uk

寻找SQL Server复制书？
http://www.nwsu.com/0974973602m.html

Ravichandran JV写道：

我今天肯定会在这两篇文章上发一篇简短的文章，但同时，我很确定你应该觉得这很有帮助。
委托是一种能够封装方法签名的类型。代表可以与事件一起使用。事件
是一种通常在类中声明的类型。

公共类MyClass
{
//指向要调用的方法的委托。在这种情况下，
//方法的返回类型是''void''。
public delegate void MyDelegate（）;
//如果要处理事件的方法
//（本例中为MyMethod）接受参数，声明
//委托如下
public delegate void MyDelegate（int i）;
//事件类型MyDelegate
公共事件MyDelegate MyEvent;
public MyClass（）
//将事件附加到代表
this.MyEvent + = new MyDelegate（MyMethod）;
}
//这是充当事件过程的方法。
public void MyMethod（）
//
//在此处理事件。
}
}


JVRavichandran
- http://www.geocities.com/
jvravichandran
- http://www.411asp.net/func/search？
qry = Ravichandran + JV& cob = aspnetpro
- http://www.southasianoutlook.com
- http://www.MSDNAA.Net
- http://www.csharphelp.com
- http://www.poetry.com/Publications/
display.asp？ID = P3966388& BN = 999& PN = 2
- 或者，只需搜索 ; JVRavichandran"
在 http://www.Google.com

***通过开发人员指南 http://www.developersdex.com ***
不要只是参加USENET ......获得奖励！

Ravichandran，


我刚发现这篇文章，看起来相当不错。
http://www.codeproject.com/csharp/De...sAndEvents.asp


如果我在阅读之后仍然感到困惑，我会告诉你的 - 到目前为止我已经跟着它了b $ b！你看，我有一个VB背景，所以学习如何正确编程
是一个有点陡峭的曲线！ :-)


-

Mark Allison，SQL Server MVP
http://www.markallison.co.uk

寻找SQL Server复制书？
http://www.nwsu.com/0974973602m.html

Ravichandran JV写道：

我今天肯定会在这两篇文章上发一篇简短的文章，但同时在
中，我很确定你会觉得这很有帮助。 br />
委托是一种能够封装方法签名的类型。代表可以与事件一起使用。事件
是一种通常在类中声明的类型。

公共类MyClass
{
//指向要调用的方法的委托。在这种情况下，
//方法的返回类型是''void''。
public delegate void MyDelegate（）;
//如果要处理事件的方法
//（本例中为MyMethod）接受参数，声明
//委托如下
public delegate void MyDelegate（int i）;
//事件类型MyDelegate
公共事件MyDelegate MyEvent;
public MyClass（）
//将事件附加到代表
this.MyEvent + = new MyDelegate（MyMethod）;
}
//这是充当事件过程的方法。
public void MyMethod（）
//
//在此处理事件。
}
}


JVRavichandran
- http://www.geocities.com/
jvravichandran
- http://www.411asp.net/func/search？
qry = Ravichandran + JV& cob = aspnetpro
- http://www.southasianoutlook.com
- http://www.MSDNAA.Net
- http://www.csharphelp.com
- http://www.poetry.com/Publications/
display.asp？ID = P3966388& BN = 999& PN = 2
- 或者，只需搜索 ; JVRavichandran"
在 http://www.Google.com

***通过开发人员指南 http://www.developersdex.com ***
不要只是参加USENET ......获得奖励！

Hi,

I am new to C# and want to create my own events within a console app.
However I am struggling mentally with this, and have looked at the MSDN
documentation but I am drawing a blank. Is there anywhere on the net
that shows a very basic delegate and a very basic event? Some nice
simple example code is what I''m looking for with no fluff around it.

Thanks!

--
Mark Allison, SQL Server MVP
http://www.markallison.co.uk

Looking for a SQL Server replication book?
http://www.nwsu.com/0974973602m.html

解决方案

I will definitely post a simple article on both today but, in the
meanwhile, I am quite sure you should find this helpful.

The delegate is a type which is capable of encapsulating a method
signature. The delegate can be used in conjunction with events. An event
is a type that is usually declared inside the class.
public class MyClass
{
// The delegate that points to the method to invoke. The
// method''s return type in this case is ''void''.
public delegate void MyDelegate();
// If the method that is going to handle the event
// (MyMethod in this case) takes parameters, declare
// the delegate as follows
public delegate void MyDelegate(int i);
// The event is of type MyDelegate
public event MyDelegate MyEvent;
public MyClass()
{
// Attach the event to the delegate
this.MyEvent+=new MyDelegate(MyMethod);
}
// This is the method that acts as the event procedure.
public void MyMethod()
{
// Handle the event here.
}
}

with regards,
J.V.Ravichandran
- http://www.geocities.com/
jvravichandran
- http://www.411asp.net/func/search?
qry=Ravichandran+J.V.&cob=aspnetpro
- http://www.southasianoutlook.com
- http://www.MSDNAA.Net
- http://www.csharphelp.com
- http://www.poetry.com/Publications/
display.asp?ID=P3966388&BN=999&PN=2
- Or, just search on "J.V.Ravichandran"
at http://www.Google.com

*** Sent via Developersdex http://www.developersdex.com ***
Don''t just participate in USENET...get rewarded for it!

Thanks,

OK, let me put this into my own words, and then you can slap me down. ;-)

You create a delegate called public delegate void MyDelegate(int i) -
this delegate runs code with the same sig. Cool, got that.

You then define your event as follows:
public event MyDelegate MyEvent;

I don''t acutally understand the above line of code. What is that
effectively declaring?

When you attach the event to the delegate are you "firing the event",
raising the event? I want the event to be listened to from another class
altogether from this one. How do I get that other class to listen to
events in this class?

I''m sorry but your very simple example just confused me even more.
--
Mark Allison, SQL Server MVP
http://www.markallison.co.uk

Looking for a SQL Server replication book?
http://www.nwsu.com/0974973602m.html
Ravichandran J.V. wrote:

I will definitely post a simple article on both today but, in the
meanwhile, I am quite sure you should find this helpful.

The delegate is a type which is capable of encapsulating a method
signature. The delegate can be used in conjunction with events. An event
is a type that is usually declared inside the class.
public class MyClass
{
// The delegate that points to the method to invoke. The
// method''s return type in this case is ''void''.
public delegate void MyDelegate();
// If the method that is going to handle the event
// (MyMethod in this case) takes parameters, declare
// the delegate as follows
public delegate void MyDelegate(int i);
// The event is of type MyDelegate
public event MyDelegate MyEvent;
public MyClass()
{
// Attach the event to the delegate
this.MyEvent+=new MyDelegate(MyMethod);
}
// This is the method that acts as the event procedure.
public void MyMethod()
{
// Handle the event here.
}
}

with regards,
J.V.Ravichandran
- http://www.geocities.com/
jvravichandran
- http://www.411asp.net/func/search?
qry=Ravichandran+J.V.&cob=aspnetpro
- http://www.southasianoutlook.com
- http://www.MSDNAA.Net
- http://www.csharphelp.com
- http://www.poetry.com/Publications/
display.asp?ID=P3966388&BN=999&PN=2
- Or, just search on "J.V.Ravichandran"
at http://www.Google.com

*** Sent via Developersdex http://www.developersdex.com ***
Don''t just participate in USENET...get rewarded for it!

Ravichandran,

I just found this article, looks quite good.
http://www.codeproject.com/csharp/De...sAndEvents.asp

I will let you know if I''m still confused after reading that - I''m
following it so far! You see, I have a VB background, so learning how to
program properly is a bit of a steep curve! :-)

--
Mark Allison, SQL Server MVP
http://www.markallison.co.uk

Looking for a SQL Server replication book?
http://www.nwsu.com/0974973602m.html
Ravichandran J.V. wrote:

I will definitely post a simple article on both today but, in the
meanwhile, I am quite sure you should find this helpful.

The delegate is a type which is capable of encapsulating a method
signature. The delegate can be used in conjunction with events. An event
is a type that is usually declared inside the class.
public class MyClass
{
// The delegate that points to the method to invoke. The
// method''s return type in this case is ''void''.
public delegate void MyDelegate();
// If the method that is going to handle the event
// (MyMethod in this case) takes parameters, declare
// the delegate as follows
public delegate void MyDelegate(int i);
// The event is of type MyDelegate
public event MyDelegate MyEvent;
public MyClass()
{
// Attach the event to the delegate
this.MyEvent+=new MyDelegate(MyMethod);
}
// This is the method that acts as the event procedure.
public void MyMethod()
{
// Handle the event here.
}
}

with regards,
J.V.Ravichandran
- http://www.geocities.com/
jvravichandran
- http://www.411asp.net/func/search?
qry=Ravichandran+J.V.&cob=aspnetpro
- http://www.southasianoutlook.com
- http://www.MSDNAA.Net
- http://www.csharphelp.com
- http://www.poetry.com/Publications/
display.asp?ID=P3966388&BN=999&PN=2
- Or, just search on "J.V.Ravichandran"
at http://www.Google.com

*** Sent via Developersdex http://www.developersdex.com ***
Don''t just participate in USENET...get rewarded for it!

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