how can i compare two string with same presentaion but different byte[]? c#

Question

How can i compare this two value? is there any idea?

Please look at this image and tell me what can i do?

1- The code

2- variable values and it seams the same!

3- The output that shows it is not OK! and these values are not the same!

4- I understand that the only different between these two values are in 2 bytes of them. (I use this link for getting byte[] of string with UTF8 property)

Solution:

I wrote this extension method to solve the problem:

public static class FarsiExtension
{
    public static string FixYEH(this String instance)
    {
        return instance.Replace('ي', 'ی');
    }
}

and you can use it this way:

string fixedValue = stateKhedmat.ToString().FixYEH();

How do we type this arabic? text? Please add it into the question? — Sash Sinha, Apr 12 '17 at 11:30
you can try some of the different cultures https://msdn.microsoft.com/en-us/library/ee825488 — Slai, Apr 12 '17 at 11:32
پایان خدمت and پايان خدمت . it is persian/Farsi not arabic ;) — Mohammad Reza Khahani, Apr 12 '17 at 11:33
You could try to normalize the strings first using `String.Normalize`. If the glyphs are identical, and just use different codepoints, then normalizing should return a canonical form that you can compare. — Dirk, Apr 12 '17 at 11:37
@Dirk I've tested normalize and it sadly does not work, i've tried all 4 options. — EpicKip, Apr 12 '17 at 11:43
One of the strings contains an [ARABIC LETTER FARSI YEH](http://www.fileformat.info/info/unicode/char/06cc/index.htm), the other contains an [ARABIC LETTER YEH](http://www.fileformat.info/info/unicode/char/064a/index.htm). I'm not familiar with Farsi or Arabic so I don't know if they should look the same when part of a word, but on their own they look slightly different. — Pieter Witvoet, Apr 12 '17 at 11:44
Thanks Pieter Witvoet. I get char[] of string and replace it with the correct one. — Mohammad Reza Khahani, Apr 12 '17 at 12:10

score 0 · Answer 1 · answered Apr 12 '17 at 11:32

0

That they look like the same character doesn't mean it is the same character, as you see in the byte code.

I figure the only way to make these strings match is to always normalize the strings that you get by replacing 1 with the other.

answered Apr 12 '17 at 11:32

Joel Harkes

10,975
3
46
65

score 0 · Answer 2 · answered Apr 12 '17 at 11:33

0

I think you're have padding issues, convert both string to bytes and remove padding and convert back to string. this should solve this problem.

answered Apr 12 '17 at 11:33

Oscar Itaba

24
2

score 0 · Answer 3 · answered Apr 12 '17 at 13:53

Seems to work with CompareOptions.IgnoreNonSpace, but I am not sure how to test for false positives:

string s1 = "پایان خدمت", s2 = "پايان خدمت"; char c1 = 'ی', c2 = 'ي';
var ci = System.Globalization.CultureInfo.InvariantCulture.CompareInfo;

Debug.Print(ci.Compare(s1, s2, CompareOptions.IgnoreNonSpace) + ""); // 0
Debug.Print(ci.Compare(s1, s2                               ) + ""); // 1

Debug.Print(ci.IndexOf(s1, c1, CompareOptions.IgnoreNonSpace) + ""); // 2
Debug.Print(ci.IndexOf(s1, c1                               ) + ""); // 2

Debug.Print(ci.IndexOf(s1, c2, CompareOptions.IgnoreNonSpace) + ""); // 2
Debug.Print(ci.IndexOf(s1, c2                               ) + ""); // -1

how can i compare two string with same presentaion but different byte[]? c#

3 Answers3