将字符串转换为未知的基本类型（最好的猜测） [英] Converting string to unknown primitive type (best guess)

问题描述

显然，这是不是你想这样做，除非你是在无奈的情况下，但没有人有这样的一个很好的例子（加分更清晰的方法名思维）：

Obviously this isn't something you would want to do unless you're in a helpless situation, but does anyone have a good example of something like this (bonus points for thinking of a clearer method name):

public static object ConvertToBestGuessPrimitive(string toConvert)
{
    if(looksLikeAnInt)
    {
        return as an int;
    }
    else if(looksLikeABoolean)
    {
        return as a boolean;
    }
    else
    {
        return as a string;
    }
}

我唯一的想法是链在一起了一堆的TryParse方法一起在一个合理的秩序，回落到字符串，如果没有什么作品。谁能想到更好的东西？这个问题有可能已经被回答的地方，但我似乎无法找到任何有用的结果与使用的过于通用的搜索条件。

The only idea I had was to chain together a bunch of TryParse methods together in a sensible order and fall back to string if nothing works. Can anyone think of something better? This question has probably already been answered somewhere, but I can't seem to find any useful results with the overly generic search terms being used.

编辑 - 因为有一直是多么有用，这将是没有一个例子一些批评，这里有一个我想出了以满足具体的需求（但令人难以置信的）......说我分析，我从得到一个错误日志文件不受控制的来源。日志文件中有规定发生错误的方法名和参数。我想自动化测试通过寻找最佳匹配的方法和参数，并试图再次打电话给他们的错误条件。也许一个愚蠢的例子（请不要试图拿出但你可以做到这一点在这种情况下反应，因为这只是一个例子），但它说明几点：1）输入超出我的控制。 2）最好的猜测是基于一些标准，找到一个合适的匹配。例如：一个2012年10月2日是更可能意味着一个DateTime不是字符串

Edit - Since there's been some criticism of how useful this would be without an example, here's one I came up with to satisfy a concrete need (however implausible)...Say I am parsing an error log file that I get from an uncontrolled source. The log file has method names and arguments that were provided for where the error occurred. I want to automate testing the error conditions by finding the best matched method and arguments and attempting to call them again. Maybe a stupid example (please don't try and come up with "but you could do this in this scenario" responses since this is just an example), but it illustrates a few points: 1) The input is out of my control. 2) The best-guess is based on some criteria for finding a suitable match. For example: a "10/2/2012" is more likely to mean a DateTime than a string.

推荐答案

所以，你想摆脱IF-别人的？什么是这样的：

So you're looking to get rid of if-elses? What about something like this:

interface IConverter
{
  bool TryConvert(string obj, out object result);
}

class IntConvert : IConverter
{
  public bool TryConvert(string obj, out object result) { /* stuff here */ }
}

class BoolConverter : IConverter {...}

// etc.
List<IConverter> converters = new List<IConverter>();
converters.Add(new IntConvert());
converters.Add(new BoolConvert());

public static object ConvertToBestGuessPrimitive(string toConvert)
{
  object obj;
  foreach(var converter in converters) {
    if(converter.TryConvert(toConvert, out obj))
       return obj;
  }

  return null;
}

更新：感谢Servy您的建议

UPDATE: Thanks Servy for the suggestion.

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