November 2020
Intermediate to advanced
226 pages
5h 34m
Chinese
Content preview from C#并发编程经典实例（第2版）
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取消
｜
133
}
catch
(OperationCanceledException)
{
MessageBox.Show(
"
Delay was canceled.");
}
catch
(Exception)
{
MessageBox.Show(
"
Delay completed with error.");
throw
;
}
finally
{
StartButton.IsEnabled =
true
;
CancelButton.IsEnabled =
false
;
}
}
private void
CancelButton_Click(
object
sender, RoutedEventArgs e)
{
_cts.Cancel();
CancelButton.IsEnabled =
false
;
}
讨论
在本节中，最贴近现实的示例使用了
GUI
应用程序，但不要想当然地以为取消只能用于用
户界面，它同样可用于服务器。举例来说，
ASP.NET
提供的取消令牌就代表了取消超时或
客户端连接断开。确实，取消令牌源在服务器端更为少见，但这不等于不可以使用它们。
倘若基于某种
ASP.NET
取消未涉及的原因，比如需求处理中的某一部分存在额外超时，
因而需要执行取消的话，它们便很有用。
参阅
10.4
节探讨向
async
代码传递令牌。
10.5
节探讨向并行代码传递令牌。
10.6
节探讨在响应式代码中使用令牌。
10.7
节探讨向数据流网格传递令牌。
10.2
通过轮询来响应取消 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.