事件问题 [英] Event question
问题描述
基类中的
我已经声明了以下事件处理程序：
公共抽象类MyBaseClass :: MarshalByRefObject
{
.....
公共活动EventHandler OnMsgSent;
....
}
在派生类中，我尝试按以下方式调用此事件：
public override void MsgSent（）
{
if（OnMsgSent！= null）
{
GbMessageEventArgs e = new GbMessageEventArgs（this）;
e.InfoString ="消息已成功发送！;
OnMsgSent（this，e）;
}
}
但是当我编译这个时，我收到以下错误消息：
"事件，< my namespace>。< base class> ; .OnMsgSent''只能出现在
左手边的+ = ...."
我做错了什么？
感谢提示。
Rainer
Hi,
in a base class I have declared the following event handler:
public abstract class MyBaseClass : :MarshalByRefObject
{
.....
public event EventHandler OnMsgSent;
....
}
In a derived class I try to call this event in the following way:
public override void MsgSent()
{
if(OnMsgSent != null)
{
GbMessageEventArgs e = new GbMessageEventArgs(this);
e.InfoString = "Message was successfully sent!";
OnMsgSent(this,e);
}
}
but when I trie to compile this, I get the following error message:
"The event ,<my namespace>.<base class>.OnMsgSent'' can only appear on the
left hand side of += ...."
What is it I am doing wrong?
Thanks for hints.
Rainer
我不相信你可以覆盖一个事件。由于OnMsgSent是
定义为偶数使用：
公共事件EventHandler OnMsgSent;
它必须始终是以这种方式定义。你不能创建一个名为OnMsgSent的*方法*
。方法和事件是两回事。
你想要完成什么？
最好的问候
Johann Blake
I don''t believe that you can override an event. Since OnMsgSent is
defined as an even using:
public event EventHandler OnMsgSent;
it must always be defined in this manner. You cannot create a *method*
called OnMsgSent. A method and an event are two different things.
What exactly do you want to accomplish?
Best Regards
Johann Blake
嗨约翰，
感谢您的回答！
我（在leas我不知道......）不要覆盖事件。
在基类（这是抽象的）中我声明了抽象方法：
public abstract void MsgSent（）;
我的意图是每个派生类都必须实现这个mehtod。
这个方法的目的是调用所有分配的代表 - OnMsgSent -
声明为事件句柄，如前所示。
问候
Rainer
" Johann Blake" <乔********* @ yahoo.com> schrieb im Newsbeitrag
新闻：11 ******************** @ g43g2000cwa.googlegrou ps.com ...
Hi Johann,
thanks for answering!
I (at leas I am not aware of...) don''t override the event.
In the base class (which is abstract) I declared the abstract method:
public abstract void MsgSent();
My intention is that every derived class must implement this mehtod.
The purpose of this method is to call all assigned delegates - OnMsgSent -
declared as event handles as previously shown.
Regards
Rainer
"Johann Blake" <jo*********@yahoo.com> schrieb im Newsbeitrag
news:11********************@g43g2000cwa.googlegrou ps.com...
我不相信你可以覆盖一个事件。由于OnMsgSent被定义为偶数使用：
公共事件EventHandler OnMsgSent;
必须始终以这种方式定义它。你不能创建一个名为OnMsgSent的*方法*
。方法和事件是两回事。
你到底想要完成什么？
最好的问候
Johann Blake
I don''t believe that you can override an event. Since OnMsgSent is
defined as an even using:
public event EventHandler OnMsgSent;
it must always be defined in this manner. You cannot create a *method*
called OnMsgSent. A method and an event are two different things.
What exactly do you want to accomplish?
Best Regards
Johann Blake
Rainer Queck写道：
Rainer Queck wrote:
在基类中我声明了以下事件处理程序：
<公共抽象类MyBaseClass :: MarshalByRefObject
{
....
公共事件EventHandler OnMsgSent;
...
}
在派生类中，我尝试按以下方式调用此事件：
public override void MsgSent（）
{
if（OnMsgSent！= null）
{
GbMessageEventArgs e = new GbMessageEventArgs（this）;
e.InfoString ="消息已成功发送！" ;;
OnMsgSent（this，e）;
} <但是，当我编译这个时，我收到以下错误消息：
"事件，< my namespace>。< base class> .OnMsgSent' ' 能够 只出现在
左侧+ = ...."
[我怀疑这个错误出现在你注册事件的地方，可以
你告诉我们你如何注册活动]。
我做错了什么？
感谢提示。
Rainer
Hi,
in a base class I have declared the following event handler:
public abstract class MyBaseClass : :MarshalByRefObject
{
....
public event EventHandler OnMsgSent;
...
}
In a derived class I try to call this event in the following way:
public override void MsgSent()
{
if(OnMsgSent != null)
{
GbMessageEventArgs e = new GbMessageEventArgs(this);
e.InfoString = "Message was successfully sent!";
OnMsgSent(this,e);
}
}
but when I trie to compile this, I get the following error message:
"The event ,<my namespace>.<base class>.OnMsgSent'' can only appear on the
left hand side of += ...."
[I have doubt that this error appears where you register the event, can
you show us how you register the event too].
What is it I am doing wrong?
Thanks for hints.
Rainer
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