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
｜
135
取消时调用的回调，也可以通过一种方法来注册。使用回调的方法更多地是与其他取消系
统的互操作。
10.9
节探讨在取消时使用回调。
参阅
10.1
节探讨发起取消请求。
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。
10.9
节探讨使用回调来代替轮询，以响应取消请求。
10.3
因超时而取消
问题
假设有代码需要在超时后停止运行。
解决方案
取消是用于超时场景的天然方案。超时只是取消请求的一种类型，与其他任意取消一
样，需要取消的代码只是观察取消令牌。对于取消源为计时器，它不应该知道，也不
应该关心。
有些取消令牌源，会依据计时器自动发起取消请求，对于这些源，还有一些简便的方法。
可以在构造器中传递超时：
async
Task IssueTimeoutAsync()
{
using var
cts =
new
CancellationTokenSource(TimeSpan.FromSeconds(5));
CancellationToken token = cts.Token;
await
Task.Delay(TimeSpan.FromSeconds(10), token);
}
如果已经存在
CancellationTokenSource
实例，则可以对该实例启用超时。
async
Task IssueTimeoutAsync()
{
using var
cts =
new
CancellationTokenSource(); ...
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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.