异常和返回值之间进行选择 [英] Choosing between exception and return value

问题描述

我已经创建了一个从文件解析某些文件的类。

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

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

有时可以在这种情况下，解析器解析错误有
返回某些数据。我创建特殊类的。

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
}

我该如何正确应处理这样的错误。我至少有两个选项：

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

创建自己的异常或返回值。

create my own exception or return value.

方案一

myParser.Parse(fileName, out error);

方案二

try
{
  myParser.Parse(fileName)
}

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

更新

如果我不mustaken异常背后的idelogy是一些特殊情况是某些情​​况下，该方法不适合处理。所以我想如果例如
解析器发现未知领域的文件中，或者编码是错误的是特殊情况？

If I am not mustaken the idelogy behind the exception is that something exceptional that is some situation that the method is not intended to deal with. So I wonder if for example the parser finds unknown field in the file, or the encoding is wrong is that exceptional case?

推荐答案

想想这是多么典型的有一个解析错误。如果这是典型的 - 有利于返回值。异常应该用于东西都是不正常的。

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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