一个try / catch块的性能成本 [英] Performance cost of a try/catch block

问题描述

可能重复：
  性能成本中＆lsquo的;尝试＆rsquo的;

我被告知，加入try catch块增加主要性能成本的1000倍，比不慢的顺序，在一个例子为一百万的循环。这是真的吗？

I am being told that adding a try catch block adds major performance cost in the order of 1000 times slower than without, in the example of a for loop of a million. Is this true?

这难道不是最好使用try catch块尽可能？

Isn't it best to use try catch block as much as possible?

推荐答案

从 MSDN网站

查找和设计走   异常沉重code能导致   体面PERF获胜。请记住，   这有没有关系的try / catch   块：你只能承担的费用时，   实际的异常。您   可以使用尽可能多的try / catch块，   你想。使用异常   无偿为你失去   性能。例如，你应该   远离像使用   例外的控制流。

Finding and designing away exception-heavy code can result in a decent perf win. Bear in mind that this has nothing to do with try/catch blocks: you only incur the cost when the actual exception is thrown. You can use as many try/catch blocks as you want. Using exceptions gratuitously is where you lose performance. For example, you should stay away from things like using exceptions for control flow.

另请参阅这些相关的SO问题：<一href="http://stackoverflow.com/questions/1308432/do-try-catch-blocks-hurt-performance-when-exceptions-are-not-thrown">(1) （2）的（3）和<一href="http://stackoverflow.com/questions/2075151/try-catch-blocks-always-expensive-closed">(4).

Also see these related SO questions: (1) (2) (3) and (4).

这篇关于一个try / catch块的性能成本的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！