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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集合
｜
115
9.6
阻塞队列
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。比如，一个线程可以加载数据，
在加载过程中顺着回路向下推动，同时，回路接收端的其他线程负责接收并处理数据。
解决方案
.NET
类型
BlockingCollection<T>
就是为此类回路设计的。在默认情况下，
Blocking-
Collection<T>
是一种阻塞队列，具有先进先出的特点。
阻塞队列需要在多个线程间共享，而且通常定义为私有、只读的域：
private readonly
BlockingCollection<
int
> _blockingQueue =
new
BlockingCollection<
int
>();
通常，线程要么向集合添加项，要么从集合移除项，但这两种情况不会同时发生。添加项
的线程叫作
生产者线程
，移除项的线程则叫作
消费者线程
。
生产者线程可以通过调用
Add
来添加项，当生产者线程结束时，也就是当所有项都已经添
加时，它可以通过调用
CompleteAdding
来完成集合。这会通知集合没有其他项需要添加，
随后集合会通知其消费者没有其他可添加的项。
下面这个简单的生产者样例先添加了两项，随后将集合标记为“完成”：
_blockingQueue.Add(7);
_blockingQueue.Add(13);
_blockingQueue.CompleteAdding();
消费者线程通常循环运行，等待下一项，然后进行处理。如果把生产者代码放入单独的线
程里（比如通过
Task.Run
），便可以消耗这些项，如代码示例所示： ...
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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.