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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60
｜
第
5
章
if
(item == 1)
throw new
InvalidOperationException(
"
Blech.");
return
item * 2;
});
var
subtractBlock =
new
TransformBlock<
int
,
int
>(item => item - 2);
multiplyBlock.LinkTo(subtractBlock,
new
DataflowLinkOptions { PropagateCompletion =
true
});
multiplyBlock.Post(1);
await
subtractBlock.Completion;
}
catch
(AggregateException)
{
// 捕获异常
}
每个块都会将收到的错误包装在
AggregateException
中，即便错误本身已经是
Aggregate-
Exception
，也会如此。在管道中，如果前期就出现错误，并且该错误在被观察到之前已经
沿着若干个链接传递，那么原始错误会被包装在多层
AggregateException
中。在这种情况
下，
AggregateException.Flatten
方法可以简化错误处理。
讨论
在创建网格或管道时，考虑如何处理错误。在较为简单的情况下，最好传播错误并在最后
一次性将它们全部捕获。在更为复杂的网格中，则可能需要在数据流完成时观察每个块。
如果在异常出现时，仍旧希望数据流块继续工作，那么可以把异常当作另一种数据来处 ...
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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.