在异常和返回值之间选择 [英] Choosing between exception and return value

问题描述

我创建了一个从文件解析文档的类。

I have created a class that parses some document from file.

class Parser
{
  public Parse(string fileName)
  {
    ///
  }
}

有时可能会出现解析错误，解析器有
返回某些数据。我已经创建了专门的类。

Sometimes there can be parsing errors in that case parser has to return certain data. I have created special class for that.

class ParsingError
{
 // some data
}

如何正确处理这些错误。我至少有两个选择：

How can I correctly deal with such errors. I have at least two options:

创建我自己的异常或返回值。

create my own exception or return value.

选项一

myParser.Parse(fileName, out error);

选项二

try
{
  myParser.Parse(fileName)
}

catch(MyParsingException ex)
{
  // use ex.Error field
}

更新

如果我没有错误，异常背后的意识形态是它应该处理异常的东西，那就是这种方法不是要处理的情况。

If I am not mistaken the ideology behind the exception is that it should deal with something exceptional, that is some situation that the method is not intended to deal with.

这让我想知道，例如：

解析器在文件中发现未知字段，或者编码是

the parser finds unknown field in the file, or the encoding is wrong

会被视为异常情况吗？

推荐答案

想想解析错误是多么典型。如果是典型的 - 有利于返回值。例外应该用于不正常的事情。

Think of how typical it is to have a parsing error. If it's typical - favor a return value. Exceptions should be used for things that are not normal.

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