How Can I Compare Strings in C# While Ignoring Accented Characters?
Jan 24, 2025 pm 04:07 PM
Ignore accented characters when comparing strings in C#
Handling string comparisons with accented characters can be tricky in C#. Consider the following example:
string s1 = "hello"; string s2 = "héllo"; s1.Equals(s2, StringComparison.InvariantCultureIgnoreCase); s1.Equals(s2, StringComparison.OrdinalIgnoreCase);
The two strings should be equal, but both statements return false. This is because the accents on letters are treated as different characters. To solve this problem, we can use a technique that removes additional symbols (or accents) before comparing the strings.
Remove additional symbols
Here's a way to remove additional symbols from a string:
static string RemoveDiacritics(string text)
{
// 將字符串規(guī)范化為 Unicode 規(guī)范化形式 D
string formD = text.Normalize(NormalizationForm.FormD);
// 創(chuàng)建一個(gè) StringBuilder 來(lái)保存結(jié)果字符串
StringBuilder sb = new StringBuilder();
// 迭代規(guī)范化字符串中的字符
foreach (char ch in formD)
{
// 檢查字符是否不是非間隔標(biāo)記
UnicodeCategory uc = CharUnicodeInfo.GetUnicodeCategory(ch);
if (uc != UnicodeCategory.NonSpacingMark)
{
// 將字符附加到 StringBuilder
sb.Append(ch);
}
}
// 將 StringBuilder 轉(zhuǎn)換為字符串并將其規(guī)范化為 Unicode 規(guī)范化形式 C
return sb.ToString().Normalize(NormalizationForm.FormC);
}
This method first normalizes the string into D form, which splits accented characters into multiple characters. It then iterates over these characters and filters out non-spacing tokens (i.e. accents). Finally, it recombines the remaining characters to form an unaccented string.
To use this method, simply apply it to two strings before comparing them. For example:
string s1 = "hello"; string s2 = "héllo"; s1.Equals(RemoveDiacritics(s2), StringComparison.InvariantCultureIgnoreCase); // True
This will correctly evaluate to true, considering the accented "e" in "héllo" to be equivalent to the unaccented "e" in "hello".
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