Scala：静默捕获所有异常 [英] Scala: Silently catch all exceptions

问题描述

空捕获块在Scala中似乎无效

Empty catch block seems to be invalid in Scala

try {
  func()
} catch {

} // error: illegal start of simple expression

如何非法启动我可以捕获所有异常而不进行处理吗？

How I can catch all exceptions without their processing?

推荐答案

确实不是要捕获某些异常。您仍然可以请求它：

Some exceptions really aren't meant to be caught. You can request it anyway:

try { f(x) }
catch { case _: Throwable => }

但这可能不是那么安全。

but that's maybe not so safe.

所有安全异常都由 scala.util.control.NonFatal 匹配，因此您可以：

All the safe exceptions are matched by scala.util.control.NonFatal, so you can:

import scala.util.control.NonFatal
try { f(x) }
catch { case NonFatal(t) => }

风险较小但仍然非常有用的渔获。

for a slightly less risky but still very useful catch.

或 scala.util.Try 可以为您完成：

Try { f(x) }

您可以在结果上进行模式匹配您想知道发生了什么。 （但是，当您想要 finally 块时， Try 效果不佳。）

and you can pattern match on the result if you want to know what happened. (Try doesn't work so well when you want a finally block, however.)

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