Long.Parse以阿拉伯数字表示(即١是一个整数= 1) [英] Long.Parse for Arabic-Indic digits (i.e. ١ is an integer = 1)

问题描述

我想使用.net Long.Parse("١٢٣٤٥٦٧٨٩٠")来获取1234567890，但它给出了一个错误，并且无法将这些印度数字识别为数字.
我该怎么办?

谢谢，
Mohammad Amiry

Hi,
I would like to use .net Long.Parse("١٢٣٤٥٦٧٨٩٠") to get 1234567890 but it gives an error and does not recognizes these Indic digits as numbers.
How can I do that?

Thanks,
Mohammad Amiry

推荐答案

如果可以将字符串转换为拉丁数字，则可以解析该字符串.我从未使用过国际化和Unicode，但我认为您可以一次遍历字符串中的一个字符，并使用case语句进行比较和翻译.使用StringBuilder(比使用普通字符串更有效)重建字符串，然后将结果传递给Parse.麻烦事了.

一旦有了有效的算法，就可以扩展Int32 [ ^ ]对象添加一个ParseFromIndic函数，这将使您的代码编写变得更加容易.

修订后的答案-做过一些研究，发现扩展方法仅适用于实例变量；从.Net 4.0开始，您不能编写静态扩展名.但是，您可以编写一个名称为String的String扩展名，该扩展名试图将字符串实例的值转换为数字.

If you can translate the string into Latin numerals, you can then parse that string. I''ve never used internationalization and Unicode, but I would think you could step through the string one character at a time and use a case statement to compare and translate. Rebuild the string using a StringBuilder (which is more efficient than concatinating ordinary strings) and pass the result into Parse. A nuisance, certainly.

Once you have an algorithm that works, you could extend the Int32[^] object to add a ParseFromIndic function, which will make your code writing quite a bit easier.

Revised answer - Did some research and found that extension methods only work on instanced variables; as of .Net 4.0, you cannot write static extensions. However, you could write a String extension with a name like ParseIndicNumber which attempts to convert the value of the string instance into a number.

根据MSDN .NET 4文档关于解析数字字符串 [

According to the MSDN .NET 4 doucmentation regarding the Parsing Of Numeric Strings[^] you are, sad but true , on your own.

Regards,

Manfred

这实际上称为印度阿拉伯数字，更确切地称为东方阿拉伯数字"，有趣的是阿拉伯人称呼其为印地语数字"，而欧洲人(以及许多其他人)称呼0123456789阿拉伯语"数字"；参见 http://en.wikipedia.org/wiki/Arabic_digits [

—SA

This is actually called Indo-Arabic numerals, more exactly called "Eastern Arabic", funny that Arabs call then "Hindi numerals", and Europeans (and many other) call 0123456789 "Arabic digits"; see http://en.wikipedia.org/wiki/Arabic_digits[^].

It looks like they are not parsed properly, so I''m afraid this is the only way: they should be replaced with "Arabic digits" (:-)) 01234567890 before parsing albeit not in that naive way mentioned by MohammadAmiry (:-)), but by subtracting of a constant shift from a Unicode code point (please calculate it by yourself, this is too easy; the shift is possible because the order of digits is exactly the same in both systems).

—SA

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