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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52
｜
第
4
章
body: (item, state, localValue) => localValue + item,
localFinally: localValue =>
{
lock
(mutex)
result += localValue;
});
return
result;
}
相较于
Parallel
类，
PLINQ
提供更多的自然聚合支持：
int
ParallelSum(IEnumerable<
int
> values)
{
return
values.AsParallel().Sum();
}
好吧，这种对比不公平，毕竟
PLINQ
内置了对许多运算符的支持，比如
Sum
。
PLINQ
的
Aggregate
运算符还提供了通用的聚合支持。
int
ParallelSum(IEnumerable<
int
> values)
{
return
values.AsParallel().Aggregate(
seed: 0,
func: (sum, item) => sum + item
);
}
讨论
建议在使用
Parallel
类时，利用它提供的聚合支持。另外，在大多数场景中，
PLINQ
支
持的表达更为明确，且代码篇幅更短。
参阅
4.5
节探讨
PLINQ
的基础知识。
4.3
并行调用
问题
假设需要并行调用一系列方法，而这些方法大多彼此独立。
解决方案
Parallel
类包含简单的
Invoke
方法，它是专为这种场景设计的。下面的示例会将数组对半
切分，并单独处理每一半：
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