C# string character is equal, but equal condition return false

Question

Here's part of the data from my SQL table:

When I fetch data show me like below

But when I use equal condition, it returns false

I check ASCII code and I am confused because it is different.

this.NameOfComm :

"doc" :

ｄ is U+FF44 is compart.com/en/unicode/U+FF44 - which is not ASCII D. — Dai
– Dai, Commented Jun 18, 2022 at 6:36
In your screenshot one is full width ＤＯＣ and the other is half width DOC. — ProgrammingLlama
– ProgrammingLlama, Commented Jun 18, 2022 at 6:37

Heinzi · Accepted Answer · 2022-06-18 06:43:54Z

6

If you look very closely, you will note that, in your first screenshot, the DOC in the first line has a slightly different font than the one in the second line.

One of them contains the regular ASCII characters D O C , whereas
the other one contains the fullwidth forms Ｄ Ｏ Ｃ from the Unicode block U+FF00–FFEF. These are special forms of the Latin characters used to align nicely with Chinese/Japanese/Korean characters.

(In addition, the fullwidth form characters seem to be HTML encoded, but that might be an artifact of your analysis.)

You can use string.Normalize to "fix" this:

// prints DOC
Console.WriteLine("ＤＯＣ".Normalize(NormalizationForm.FormKC));

edited Jun 18, 2022 at 6:43

answered Jun 18, 2022 at 6:38

Heinzi

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