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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数据流基础
｜
61
解决方案
可以随时关联或解耦数据流块。数据可以通过网格自由地传送，任何时候关联或解耦都是
安全的。并且，关联和解耦对线程来说也是安全的。
在关联数据流块时，保留
LinkTo
方法返回的
IDisposable
。在解耦数据流块时，则将其丢弃。
var
multiplyBlock =
new
TransformBlock<
int
,
int
>(item => item * 2);
var
subtractBlock =
new
TransformBlock<
int
,
int
>(item => item - 2);
IDisposable link = multiplyBlock.LinkTo(subtractBlock);
multiplyBlock.Post(1);
multiplyBlock.Post(2);
// 解耦数据流块
// 上面发送的数据可能已经通过链接，也可能尚未通过
// 在实际应用中，考虑使用块来替代调用Dispose
link.Dispose();
讨论
除非能够保证链接处于空闲状态，否则在解耦时可能会出现竞争条件。不过，通常无须担
忧。在块完成解耦之前，数据可能流经链接，也可能并未流经。竞争条件并不会造成数据
的重复或丢失。
解耦虽然是一种高级场景，但在很多情况下很实用。举个例子，链接的过滤器并没有办法
改变。要改变现有链接上的过滤器，就需要将旧链接解耦，并创建带有新过滤器的新链接
（选择性地将
DataflowLinkOptions.Append
设为
false ...
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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.
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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.