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
｜
131
public void
CancelableMethodWithDefault(
CancellationToken cancellationToken =
default
)
{
// 更多代码
}
CancellationToken.None
代表了永远不会被取消的取消令牌，同时也是一种特殊值，相当
于
default(CancellationToken)
。当消费者不希望操作被取消时，则会传递该值。
异步流处理取消的方式与此相似，但更为复杂，参见
3.8
节。
10.1
发起取消请求
问题
假设你的代码调用可取消的代码，也就是带有
CancellationToken
的代码，并希望将其
取消。
解决方案
CancellationTokenSource
类型是
CancellationToken
的源，只允许代码响应取消请求，这
个类型中的成员则允许代码请求取消。
所有
CancellationTokenSource
彼此独立（除非像
10.8
节那样关联它们）。
Token
属性会为
该源返回一个
CancellationToken
，而
Cancel
方法会发出实际的取消请求。
下面的代码演示了
CancellationTokenSource
的创建，以及
Token
和
Cancel
的使用。代码
使用
async
方法，这样更易于通过简短的代码示例来演示。相同的
Token
/
Cancel
配对可用
于取消所有种类的代码：
void
IssueCancelRequest()
{
using var
cts =
new
CancellationTokenSource(); ...
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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.