飞镖中的自定义例外 [英] Custom exceptions in dart

问题描述

我已经编写了这段代码来测试自定义异常在dart中的工作方式。

I have written this code to test how custom exceptions are working in dart.

我没有得到想要的输出，有人可以解释一下如何处理吗？

I'm not getting the desired output could someone explain me how to handle it??

void main() 
{   
  try
  {
    throwException();
  }
  on customException
  {
    print("custom exception is been obtained");
  }

}

throwException()
{
  throw new customException('This is my first custom exception');
}

推荐答案

您可以看一下< Dart语言之旅中的href = http://www.dartlang.org/docs/dart-up-and-running/ch02.html#exceptions rel = noreferrer>例外部分 。

You can look at the Exception part of A Tour of the Dart Language.

以下代码按预期方式工作（已获得自定义异常显示在控制台）：

The following code works as expected (custom exception is been obtained is displayed in console) :

class CustomException implements Exception {
  String cause;
  CustomException(this.cause);
}

void main() {
  try {
    throwException();
  } on CustomException {
    print("custom exception is been obtained");
  }
}

throwException() {
  throw new CustomException('This is my first custom exception');
}

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