How to compare asian (vietnamese / unicode) string in C#?

Question

I have the following code:

Thread.CurrentThread.CurrentCulture = new CultureInfo("vi-VN");

string a = "Biển Ðông";
string b = "Biển Đông";

if (a.Equals(b, StringComparison.CurrentCulture))
{
    Console.WriteLine("Yes");
}

The two strings are identical, but I always get false when checking using Equals. If I add this to a HashSet<string>, then I will get two items instead of one item in the container.

they dont even match in javascript - there must be different — Daniel A. White, Oct 19 '16 at 12:50

bytecode77 · Accepted Answer · 2016-10-19T12:59:49.907

4

Ð is not Đ in your case.

The first "D" is the ANSI character 208 and the second one is 272.

I tested this using

(int)'Ð'
(int)'Đ'

Those are different characters which look identical, but aren't.

edited Oct 19 '16 at 12:59

answered Oct 19 '16 at 12:51

bytecode77

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Damn, 30 sec appart. Well done! – Thomas Ayoub Oct 19 '16 at 12:52
Thx dude. That was fast. – Benjamin Martin Oct 19 '16 at 12:55
1

You're welcome. Also, check out LINQPad. I use this tool amongst others for diagnosis. If you enter either of these lines, the expression will be evaluated so you can see which charater it is, without creating a solution in order to execute small code snippets. – bytecode77 Oct 19 '16 at 12:56

score 2 · Answer 2 · answered Oct 19 '16 at 12:52

2

Your string are composer by the following chars:

\u0042\u0069\u1ec3\u006e \u00d0\u00f4\u006e\u0067
                            |||
\u0042\u0069\u1ec3\u006e \u0110\u00f4\u006e\u0067

answered Oct 19 '16 at 12:52

Thomas Ayoub

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score 0 · Answer 3 · answered Oct 19 '16 at 13:11

By this logic you can find, which first character is different in strings. It might be useful in this case.

char? firstocurrenceA = string1.Zip(string2, (a, b) => new { string1 = a, string2 = b })
    .Where(x => x.string1 != x.string2)
    .Select(x => x.string1)
    .FirstOrDefault();

        char? firstocurrenceB = string1.Zip(string2, (a, b) => new { string1 = a, string2 = b })
    .Where(x => x.string1 != x.string2)
    .Select(x => x.string2)
    .FirstOrDefault();

How to compare asian (vietnamese / unicode) string in C#?

3 Answers3