如何抛出异常并保留堆栈跟踪？ [英] How do I rethrow an exception and preserve the stack trace?

问题描述

此代码：

try {
  try {
    throw 1;
  } catch (e, s) {
    print("$e $s");
    throw e;
  }
} catch (e2, s2) {
  print("$e2 $s2");    
}

打印：

1 #0      main (file:///.../test.dart:34:7)

1 #0      main (file:///.../test.dart:37:7)

因此原始堆栈跟踪信息完全丢失。有什么办法可以保留堆栈跟踪吗？

So the original stack trace is completely lost. Is there any way to rethrow with the stack trace preserved?

推荐答案

Dart VM的当前版本和 dart2js 通过 rethrow 支持重新抛出，保留堆栈跟踪：

Current versions of the Dart VM and dart2js support rethrowing, preserving the stack trace, with rethrow:

void main() {
  try {
    try {
      throw 1;
    } catch (e, s) {
      print("$e $s");
      rethrow;
    }
  } catch (e2, s2) {
    print("$e2 $s2");    
  }
}

这将产生：

1 #0      main (file:///home/darshan/so/stacktrace.dart:4:7)

1 #0      main (file:///home/darshan/so/stacktrace.dart:4:7)
#1      main (file:///home/darshan/so/stacktrace.dart:7:7)

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