鉴于“事件”，我如何获得基础代表？ [英] Given an 'event', how do I obtain underlying delegates ?
问题描述
我的WinForms应用程序中的各种自定义控件在加载时注册
''Application.Idle''事件，并在dispose上取消注册。为了避免内存泄漏，我必须记得在处理时取消注册。
在申请退出之前，我想做一个'断言''向自己保证
，没有我忘记取消注册的情况。我觉得一个事件只不过是一个代表集合。
因此我尝试过：
调试.Assert（Application.Idle.Count == 0）;
然而，这并没有编译，并提出了一个问题：给定一个事件
对象，我如何获得底层委托集合？
Dave
Hi,
Various custom controls in my WinForms application register for the
''Application.Idle'' event on load, and unregister on dispose. To avoid memory
leaks, it''s essential that I remember to unregister on dispose.
Before my application exits, I''d like to do an ''assert'' to assure myself
that there are no cases in which I''ve forgotten to unregister. I was under
the impression that an event is nothing more than a collection of delegates.
I therefore tried:
Debug.Assert(Application.Idle.Count==0);
This doesn''t compile, however, and begs the question: Given an event
object, how do I obtain the underlying delegate collection?
Dave
推荐答案
是什么让你觉得你需要这样做吗？
你不是。
-
HTH，
Kevin Spencer
Microsoft MVP
..Net开发人员
你可以带鱼去骑自行车，
但需要很长时间，
且自行车必须*要*改变。
"我们称之为''戴夫'' < GH **** @ englewood.com>在消息中写道
新闻：JY ******************** @ giganews.com ...
What makes you think you need to do that?
You don''t.
--
HTH,
Kevin Spencer
Microsoft MVP
..Net Developer
You can lead a fish to a bicycle,
but it takes a very long time,
and the bicycle has to *want* to change.
"The One We Call ''Dave''" <gh****@englewood.com> wrote in message
news:JY********************@giganews.com...
你好，
我的WinForms应用程序中的各种自定义控件在加载时注册
''Application.Idle''事件，并在dispose上取消注册。为了避免内存泄漏，我必须记得在注册时取消注册。
在我的应用程序退出之前，我想做一个'断言'来保证
我自己没有忘记取消注册的情况。我的印象是，一个活动只不过是一个代表的集合。因此我尝试了：
Debug.Assert（Application.Idle.Count == 0）;
然而，这并没有编译，并提出了一个问题：给定一个事件
对象，如何获取底层委托集合？
Dave
Hi,
Various custom controls in my WinForms application register for the
''Application.Idle'' event on load, and unregister on dispose. To avoid
memory leaks, it''s essential that I remember to unregister on dispose.
Before my application exits, I''d like to do an ''assert'' to assure
myself that there are no cases in which I''ve forgotten to unregister. I
was under the impression that an event is nothing more than a collection
of delegates. I therefore tried:
Debug.Assert(Application.Idle.Count==0);
This doesn''t compile, however, and begs the question: Given an event
object, how do I obtain the underlying delegate collection?
Dave
我们打电话给我们'' 戴夫 '' " < GH **** @ englewood.com>在消息中写道
新闻：JY ******************** @ giganews.com ...
"The One We Call ''Dave''" <gh****@englewood.com> wrote in message
news:JY********************@giganews.com...
给定一个事件对象，我如何获得底层委托集合？
Given an event object, how do I obtain the underlying delegate collection?
我认为这些内容：
//活动的订阅者数量：
int n = Idle.GetInvocationList（）。长度;
- 或者 -
//获取每个订阅者：
System.Delegate [] DelegateList = Idle.GetInvocationList（）;
foreach（DelegateList中的IdleDelegate委托）{
...
}
- Alan
I think something along these lines:
// Number of subscribers to the event:
int n = Idle.GetInvocationList().Length;
- OR -
// Get at each subscriber:
System.Delegate[] DelegateList = Idle.GetInvocationList();
foreach (IdleDelegate Delegate in DelegateList) {
...
}
-- Alan
> 我们称之为''戴夫'' < GH **** @ englewood.com>在消息中写道
> "The One We Call ''Dave''" <gh****@englewood.com> wrote in message
新闻：JY ******************** @ giganews.com ......
news:JY********************@giganews.com...
给定一个事件对象，我如何获得底层代表
集合？
Given an event object, how do I obtain the underlying delegate
collection?
我认为这些内容如下：
//订阅者数量事件：
int n = Idle.GetInvocationList（）。长度;
- 或者 -
//获取每个订阅者：
System.Delegate [] DelegateList = Idle.GetInvocationList（）;
foreach（DelegateList中的IdleDelegate委托）{
...
}
I think something along these lines:
// Number of subscribers to the event:
int n = Idle.GetInvocationList().Length;
- OR -
// Get at each subscriber:
System.Delegate[] DelegateList = Idle.GetInvocationList();
foreach (IdleDelegate Delegate in DelegateList) {
...
}
这两个将导致编译器错误事件...只能出现
左侧+ =或 - =" ;;
这是一个有趣的，我现在正在试验它。
克里斯
Both of those will result in compiler error "The event...can only appear
on the left hand side of += or -=";
This is a fun one and I''m experimenting with it right now.
Chris
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