Convert fullwidth to halfwidth

Question

In C#, how do I convert a string that's using fullwidth form characters into halfwidth form characters?

For example, given userInput below, I want to convert Ｓｔａｃｋｏｖｅｒｆｌｏｗ to Stackoverflow:

string userInput= "Ｓｔａｃｋｏｖｅｒｆｌｏｗ";
//string userInput= "Stackoverflow";

Create a mapping (i.e. a `Dictionary`) that tells you which character belongs to the other one and then translate character-by-character. — poke, Aug 05 '14 at 22:39
@poke That's certainly one option, but I'm betting there might be an easier way. Perl seems to have a built-in function for this particular conversion. For C#, I'm pondering maybe `NFKC` string normalization? — Mr. Smith, Aug 05 '14 at 22:49
@AlexD Well, I didn’t comment on the content. And I just don’t get why people even bother publishing such things when it is not only barely readable but the formatting completely breaks the content (the code has lots of syntax errors). — poke, Aug 05 '14 at 22:57
@AlexD You might want to post this key point as an answer then? :) — poke, Aug 05 '14 at 23:04
Do you mean something like `userInput.Normalize(NormalizationForm.FormKC)`? — petelids, Aug 05 '14 at 23:18

petelids · Accepted Answer · 2016-10-14T11:24:27.973

26

You can use the string.Normalize() method:

string userInput = "Ｓｔａｃｋｏｖｅｒｆｌｏｗ";
string result = userInput.Normalize(NormalizationForm.FormKC);
//result = "Stackoverflow"

See example on DotNetFiddle.

More information on the Normalization Forms can be found on unicode.org.

edited Oct 14 '16 at 11:24

answered Aug 05 '14 at 23:23

petelids

1 Answers1