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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116
｜
第
9
章
当使用类似这样的回路时，需要考虑生产者比消费者运行得快的情况。如果生产项的速度
超过消耗这些项的速度，那么可能需要节流队列。
当有单独的线程（比如线程池线程）充当生产者或消费者时，阻塞队列会非常有效。但
是，如果需要异步访问回路，它们就不那么管用了。比如让
UI
线程充当消费者，参见
9.8
节介绍的异步队列。
每当在应用程序中引入类似这样的回路时，可以考虑切换到
TPL
数据流。在
很多情况下，使用
TPL
数据流比自行建立回路及背景线程更简单。
来自
TPL
数据流的
BufferBlock<T>
可以充当阻塞队列，
TPL
数据流可以建立用于处理的
管道或网格。然而，在许多更为简单的情况下，类似
BlockingCollection<T>
的普通阻塞
队列就是恰当的选择。
AsyncEx
库的
AsyncProducerConsumerQueue<T>
也可以用作阻塞队列。
参阅
若是需要类似的回路，但要规避先进先出行为，可参考
9.7
节，这一节探讨阻塞栈和阻塞
背包。
9.8
节探讨具备异步
API
而没有阻塞
API
的队列。
9.9
节探讨节流队列。
9.12
节探讨兼具异步
API
和阻塞
API
的队列。
9.7
阻塞栈和阻塞背包
问题
假设需要一个回路，能够在不同线程间传递信息或数据，但回路无须具有先进先出的行为。
解决方案
在默认情况下，
.NET
类型
BlockingCollection<T>
充当阻塞队列，但它也能充当任意种类
的生产者集合（或消费者集合），实际上它是对线程安全集合的包装，并且这个包装集成
了
IProducerConsumerCollection<T> ...
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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.