我正在尝试转换法语加拿大语中的一些字符串，基本上，我希望能够在保留字母的同时取出字母中的法语重音符号。 （例如，将é转换为e，因此crème brûlée将成为creme brulee）
实现这一目标的最佳方法是什么？
答案 0 :(得分：480)
我没有使用过这种方法，但迈克尔·卡普兰在他的博客文章（带有令人困惑的标题）中描述了一种方法，该文章讨论了剥离变音符号：Stripping is an interesting job (aka On the meaning of meaningless, aka All Mn characters are non-spacing, but some are more non-spacing than others)
static string RemoveDiacritics(string text)
{
var normalizedString = text.Normalize(NormalizationForm.FormD);
var stringBuilder = new StringBuilder();
foreach (var c in normalizedString)
{
var unicodeCategory = CharUnicodeInfo.GetUnicodeCategory(c);
if (unicodeCategory != UnicodeCategory.NonSpacingMark)
{
stringBuilder.Append(c);
}
}
return stringBuilder.ToString().Normalize(NormalizationForm.FormC);
}
请注意，这是他早期帖子的后续内容：Stripping diacritics....
该方法使用String.Normalize将输入字符串拆分为组成字形（基本上将“基本”字符与变音符号分开），然后扫描结果并仅保留基本字符。这有点复杂，但实际上你正在研究一个复杂的问题。
当然，如果你限制自己使用法语，你可能会按照@David Dibben的推荐，在How to remove accents and tilde in a C++ std::string中使用简单的基于表格的方法。
答案 1 :(得分：141)
这对我有用......
string accentedStr;
byte[] tempBytes;
tempBytes = System.Text.Encoding.GetEncoding("ISO-8859-8").GetBytes(accentedStr);
string asciiStr = System.Text.Encoding.UTF8.GetString(tempBytes);
快速和安培;！短
答案 2 :(得分：29)
如果有人感兴趣，我正在寻找类似的东西并结束了以下内容：
public static string NormalizeStringForUrl(string name)
{
String normalizedString = name.Normalize(NormalizationForm.FormD);
StringBuilder stringBuilder = new StringBuilder();
foreach (char c in normalizedString)
{
switch (CharUnicodeInfo.GetUnicodeCategory(c))
{
case UnicodeCategory.LowercaseLetter:
case UnicodeCategory.UppercaseLetter:
case UnicodeCategory.DecimalDigitNumber:
stringBuilder.Append(c);
break;
case UnicodeCategory.SpaceSeparator:
case UnicodeCategory.ConnectorPunctuation:
case UnicodeCategory.DashPunctuation:
stringBuilder.Append('_');
break;
}
}
string result = stringBuilder.ToString();
return String.Join("_", result.Split(new char[] { '_' }
, StringSplitOptions.RemoveEmptyEntries)); // remove duplicate underscores
}
答案 3 :(得分：18)
我需要一些可以转换所有主要unicode字符的内容，并且投票的答案会留下一些，所以我已经在C＃中创建了一个可以轻松自定义的CodeIgniter convert_accented_characters($str)版本：
using System;
using System.Text;
using System.Collections.Generic;
public static class Strings
{
static Dictionary<string, string> foreign_characters = new Dictionary<string, string>
{
{ "äæǽ", "ae" },
{ "öœ", "oe" },
{ "ü", "ue" },
{ "Ä", "Ae" },
{ "Ü", "Ue" },
{ "Ö", "Oe" },
{ "ÀÁÂÃÄÅǺĀĂĄǍΑΆẢẠẦẪẨẬẰẮẴẲẶА", "A" },
{ "àáâãåǻāăąǎªαάảạầấẫẩậằắẵẳặа", "a" },
{ "Б", "B" },
{ "б", "b" },
{ "ÇĆĈĊČ", "C" },
{ "çćĉċč", "c" },
{ "Д", "D" },
{ "д", "d" },
{ "ÐĎĐΔ", "Dj" },
{ "ðďđδ", "dj" },
{ "ÈÉÊËĒĔĖĘĚΕΈẼẺẸỀẾỄỂỆЕЭ", "E" },
{ "èéêëēĕėęěέεẽẻẹềếễểệеэ", "e" },
{ "Ф", "F" },
{ "ф", "f" },
{ "ĜĞĠĢΓГҐ", "G" },
{ "ĝğġģγгґ", "g" },
{ "ĤĦ", "H" },
{ "ĥħ", "h" },
{ "ÌÍÎÏĨĪĬǏĮİΗΉΊΙΪỈỊИЫ", "I" },
{ "ìíîïĩīĭǐįıηήίιϊỉịиыї", "i" },
{ "Ĵ", "J" },
{ "ĵ", "j" },
{ "ĶΚК", "K" },
{ "ķκк", "k" },
{ "ĹĻĽĿŁΛЛ", "L" },
{ "ĺļľŀłλл", "l" },
{ "М", "M" },
{ "м", "m" },
{ "ÑŃŅŇΝН", "N" },
{ "ñńņňʼnνн", "n" },
{ "ÒÓÔÕŌŎǑŐƠØǾΟΌΩΏỎỌỒỐỖỔỘỜỚỠỞỢО", "O" },
{ "òóôõōŏǒőơøǿºοόωώỏọồốỗổộờớỡởợо", "o" },
{ "П", "P" },
{ "п", "p" },
{ "ŔŖŘΡР", "R" },
{ "ŕŗřρр", "r" },
{ "ŚŜŞȘŠΣС", "S" },
{ "śŝşșšſσςс", "s" },
{ "ȚŢŤŦτТ", "T" },
{ "țţťŧт", "t" },
{ "ÙÚÛŨŪŬŮŰŲƯǓǕǗǙǛŨỦỤỪỨỮỬỰУ", "U" },
{ "ùúûũūŭůűųưǔǖǘǚǜυύϋủụừứữửựу", "u" },
{ "ÝŸŶΥΎΫỲỸỶỴЙ", "Y" },
{ "ýÿŷỳỹỷỵй", "y" },
{ "В", "V" },
{ "в", "v" },
{ "Ŵ", "W" },
{ "ŵ", "w" },
{ "ŹŻŽΖЗ", "Z" },
{ "źżžζз", "z" },
{ "ÆǼ", "AE" },
{ "ß", "ss" },
{ "IJ", "IJ" },
{ "ij", "ij" },
{ "Œ", "OE" },
{ "ƒ", "f" },
{ "ξ", "ks" },
{ "π", "p" },
{ "β", "v" },
{ "μ", "m" },
{ "ψ", "ps" },
{ "Ё", "Yo" },
{ "ё", "yo" },
{ "Є", "Ye" },
{ "є", "ye" },
{ "Ї", "Yi" },
{ "Ж", "Zh" },
{ "ж", "zh" },
{ "Х", "Kh" },
{ "х", "kh" },
{ "Ц", "Ts" },
{ "ц", "ts" },
{ "Ч", "Ch" },
{ "ч", "ch" },
{ "Ш", "Sh" },
{ "ш", "sh" },
{ "Щ", "Shch" },
{ "щ", "shch" },
{ "ЪъЬь", "" },
{ "Ю", "Yu" },
{ "ю", "yu" },
{ "Я", "Ya" },
{ "я", "ya" },
};
public static char RemoveDiacritics(this char c){
foreach(KeyValuePair<string, string> entry in foreign_characters)
{
if(entry.Key.IndexOf (c) != -1)
{
return entry.Value[0];
}
}
return c;
}
public static string RemoveDiacritics(this string s)
{
//StringBuilder sb = new StringBuilder ();
string text = "";
foreach (char c in s)
{
int len = text.Length;
foreach(KeyValuePair<string, string> entry in foreign_characters)
{
if(entry.Key.IndexOf (c) != -1)
{
text += entry.Value;
break;
}
}
if (len == text.Length) {
text += c;
}
}
return text;
}
}
<强>用法
// for strings
"crème brûlée".RemoveDiacritics (); // creme brulee
// for chars
"Ã"[0].RemoveDiacritics (); // A
答案 4 :(得分：16)
如果有人感兴趣，这里是java等价物：
import java.text.Normalizer;
public class MyClass
{
public static String removeDiacritics(String input)
{
String nrml = Normalizer.normalize(input, Normalizer.Form.NFD);
StringBuilder stripped = new StringBuilder();
for (int i=0;i<nrml.length();++i)
{
if (Character.getType(nrml.charAt(i)) != Character.NON_SPACING_MARK)
{
stripped.append(nrml.charAt(i));
}
}
return stripped.toString();
}
}
答案 5 :(得分：12)
我经常使用基于我在这里找到的另一个版本的扩展方法 （见Replacing characters in C# (ascii)） 快速解释：
代码：
using System.Linq;
using System.Text;
using System.Globalization;
// namespace here
public static class Utility
{
public static string RemoveDiacritics(this string str)
{
if (null == str) return null;
var chars =
from c in str.Normalize(NormalizationForm.FormD).ToCharArray()
let uc = CharUnicodeInfo.GetUnicodeCategory(c)
where uc != UnicodeCategory.NonSpacingMark
select c;
var cleanStr = new string(chars.ToArray()).Normalize(NormalizationForm.FormC);
return cleanStr;
}
// or, alternatively
public static string RemoveDiacritics2(this string str)
{
if (null == str) return null;
var chars = str
.Normalize(NormalizationForm.FormD)
.ToCharArray()
.Where(c=> CharUnicodeInfo.GetUnicodeCategory(c) != UnicodeCategory.NonSpacingMark)
.ToArray();
return new string(chars).Normalize(NormalizationForm.FormC);
}
}
答案 6 :(得分：9)
希腊语（ISO）的CodePage可以做到
有关此代码页的信息是System.Text.Encoding.GetEncodings()。了解：https://msdn.microsoft.com/pt-br/library/system.text.encodinginfo.getencoding(v=vs.110).aspx
希腊语（ISO）的代码页 28597 且名称 iso-8859-7 。
转到代码... \ o /
string text = "Você está numa situação lamentável";
string textEncode = System.Web.HttpUtility.UrlEncode(text, Encoding.GetEncoding("iso-8859-7"));
//result: "Voce+esta+numa+situacao+lamentavel"
string textDecode = System.Web.HttpUtility.UrlDecode(textEncode);
//result: "Voce esta numa situacao lamentavel"
所以，写这个函数......
public string RemoveAcentuation(string text)
{
return
System.Web.HttpUtility.UrlDecode(
System.Web.HttpUtility.UrlEncode(
text, Encoding.GetEncoding("iso-8859-7")));
}
请注意...... Encoding.GetEncoding("iso-8859-7")相当于Encoding.GetEncoding(28597)，因为第一个是名称，第二个是编码的代码页。
答案 7 :(得分：4)
这在java中运行良好。
它基本上将所有重音字符转换为deAccented对应字符，然后将它们组合为变音符号。现在你可以使用正则表达式去除变音符号。
import java.text.Normalizer;
import java.util.regex.Pattern;
public String deAccent(String str) {
String nfdNormalizedString = Normalizer.normalize(str, Normalizer.Form.NFD);
Pattern pattern = Pattern.compile("\\p{InCombiningDiacriticalMarks}+");
return pattern.matcher(nfdNormalizedString).replaceAll("");
}
答案 8 :(得分：3)
TL; DR-C# string extension method
我认为保留字符串含义的最佳解决方案是转换字符而不是去除字符，在示例crème brûlée与crme brle与creme brulee的示例中已很好地说明了这一点。
我签出了Alexander's comment above，发现Lucene.Net代码是Apache 2.0许可的，所以我已经将该类修改为简单的字符串扩展方法。您可以像这样使用它：
var originalString = "crème brûlée";
var maxLength = originalString.Length; // limit output length as necessary
var foldedString = originalString.FoldToASCII(maxLength);
// "creme brulee"
该函数太长，无法发布到StackOverflow答案中（允许约13.9万个字符，不得超过3万个字符），所以I made a gist and attributed the authors：
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/// <summary>
/// This class converts alphabetic, numeric, and symbolic Unicode characters
/// which are not in the first 127 ASCII characters (the "Basic Latin" Unicode
/// block) into their ASCII equivalents, if one exists.
/// <para/>
/// Characters from the following Unicode blocks are converted; however, only
/// those characters with reasonable ASCII alternatives are converted:
///
/// <ul>
/// <item><description>C1 Controls and Latin-1 Supplement: <a href="http://www.unicode.org/charts/PDF/U0080.pdf">http://www.unicode.org/charts/PDF/U0080.pdf</a></description></item>
/// <item><description>Latin Extended-A: <a href="http://www.unicode.org/charts/PDF/U0100.pdf">http://www.unicode.org/charts/PDF/U0100.pdf</a></description></item>
/// <item><description>Latin Extended-B: <a href="http://www.unicode.org/charts/PDF/U0180.pdf">http://www.unicode.org/charts/PDF/U0180.pdf</a></description></item>
/// <item><description>Latin Extended Additional: <a href="http://www.unicode.org/charts/PDF/U1E00.pdf">http://www.unicode.org/charts/PDF/U1E00.pdf</a></description></item>
/// <item><description>Latin Extended-C: <a href="http://www.unicode.org/charts/PDF/U2C60.pdf">http://www.unicode.org/charts/PDF/U2C60.pdf</a></description></item>
/// <item><description>Latin Extended-D: <a href="http://www.unicode.org/charts/PDF/UA720.pdf">http://www.unicode.org/charts/PDF/UA720.pdf</a></description></item>
/// <item><description>IPA Extensions: <a href="http://www.unicode.org/charts/PDF/U0250.pdf">http://www.unicode.org/charts/PDF/U0250.pdf</a></description></item>
/// <item><description>Phonetic Extensions: <a href="http://www.unicode.org/charts/PDF/U1D00.pdf">http://www.unicode.org/charts/PDF/U1D00.pdf</a></description></item>
/// <item><description>Phonetic Extensions Supplement: <a href="http://www.unicode.org/charts/PDF/U1D80.pdf">http://www.unicode.org/charts/PDF/U1D80.pdf</a></description></item>
/// <item><description>General Punctuation: <a href="http://www.unicode.org/charts/PDF/U2000.pdf">http://www.unicode.org/charts/PDF/U2000.pdf</a></description></item>
/// <item><description>Superscripts and Subscripts: <a href="http://www.unicode.org/charts/PDF/U2070.pdf">http://www.unicode.org/charts/PDF/U2070.pdf</a></description></item>
/// <item><description>Enclosed Alphanumerics: <a href="http://www.unicode.org/charts/PDF/U2460.pdf">http://www.unicode.org/charts/PDF/U2460.pdf</a></description></item>
/// <item><description>Dingbats: <a href="http://www.unicode.org/charts/PDF/U2700.pdf">http://www.unicode.org/charts/PDF/U2700.pdf</a></description></item>
/// <item><description>Supplemental Punctuation: <a href="http://www.unicode.org/charts/PDF/U2E00.pdf">http://www.unicode.org/charts/PDF/U2E00.pdf</a></description></item>
/// <item><description>Alphabetic Presentation Forms: <a href="http://www.unicode.org/charts/PDF/UFB00.pdf">http://www.unicode.org/charts/PDF/UFB00.pdf</a></description></item>
/// <item><description>Halfwidth and Fullwidth Forms: <a href="http://www.unicode.org/charts/PDF/UFF00.pdf">http://www.unicode.org/charts/PDF/UFF00.pdf</a></description></item>
/// </ul>
/// <para/>
/// See: <a href="http://en.wikipedia.org/wiki/Latin_characters_in_Unicode">http://en.wikipedia.org/wiki/Latin_characters_in_Unicode</a>
/// <para/>
/// For example, '&agrave;' will be replaced by 'a'.
/// </summary>
public static partial class StringExtensions
{
/// <summary>
/// Converts characters above ASCII to their ASCII equivalents. For example,
/// accents are removed from accented characters.
/// </summary>
/// <param name="input"> The string of characters to fold </param>
/// <param name="length"> The length of the folded return string </param>
/// <returns> length of output </returns>
public static string FoldToASCII(this string input, int? length = null)
{
// See https://gist.github.com/andyraddatz/e6a396fb91856174d4e3f1bf2e10951c
}
}
希望对别人有帮助，这是我找到的最可靠的解决方案！
答案 9 :(得分：3)
这很有趣这样的问题可以获得如此多的答案，但是没有一个符合我的要求:)周围有很多语言，完全与语言无关的解决方案是AFAIK真的不可能，正如其他人提到的那样FormC或FormD提出了问题。
由于最初的问题与法语有关，因此最简单的工作答案确实是
pg_table_size(regclass)1251应该被输入语言的编码代码替换。
然而，这仅用一个字符替换一个字符。由于我也使用德语作为输入，我做了手动转换
public static string ConvertWesternEuropeanToASCII(this string str)
{
return Encoding.ASCII.GetString(Encoding.GetEncoding(1251).GetBytes(str));
}
它可能无法提供最佳性能，但至少它非常易于阅读和扩展。 正则表达式是NO GO，比任何字符/字符串都慢得多。
我还有一个非常简单的方法来删除空间：
public static string LatinizeGermanCharacters(this string str)
{
StringBuilder sb = new StringBuilder(str.Length);
foreach (char c in str)
{
switch (c)
{
case 'ä':
sb.Append("ae");
break;
case 'ö':
sb.Append("oe");
break;
case 'ü':
sb.Append("ue");
break;
case 'Ä':
sb.Append("Ae");
break;
case 'Ö':
sb.Append("Oe");
break;
case 'Ü':
sb.Append("Ue");
break;
case 'ß':
sb.Append("ss");
break;
default:
sb.Append(c);
break;
}
}
return sb.ToString();
}
最终，我使用了以上所有3个扩展程序的组合：
public static string RemoveSpace(this string str)
{
return str.Replace(" ", string.Empty);
}
一个小单元测试（不详尽）成功通过。
public static string LatinizeAndConvertToASCII(this string str, bool keepSpace = false)
{
str = str.LatinizeGermanCharacters().ConvertWesternEuropeanToASCII();
return keepSpace ? str : str.RemoveSpace();
}
答案 10 :(得分：2)
接受的答案是完全正确的，但现在，它应该更新为使用 Rune 类而不是 CharUnicodeInfo，因为 C# 和 .NET 更新了最新版本中分析字符串的方式（Rune 类已在 .NET Core 3.0 中添加）。
现在建议使用以下 .NET 5+ 代码，因为它更适用于非拉丁字符：
static string RemoveDiacritics(string text)
{
var normalizedString = text.Normalize(NormalizationForm.FormD);
var stringBuilder = new StringBuilder();
foreach (var c in normalizedString.EnumerateRunes())
{
var unicodeCategory = Rune.GetUnicodeCategory(c);
if (unicodeCategory != UnicodeCategory.NonSpacingMark)
{
stringBuilder.Append(c);
}
}
return stringBuilder.ToString().Normalize(NormalizationForm.FormC);
}
答案 11 :(得分：2)
您可以使用MMLib.Extensions nuget package中的字符串扩展名：
using MMLib.RapidPrototyping.Generators;
public void ExtensionsExample()
{
string target = "aácčeéií";
Assert.AreEqual("aacceeii", target.RemoveDiacritics());
}
Nuget页面：https://www.nuget.org/packages/MMLib.Extensions/ Codeplex项目网站https://mmlib.codeplex.com/
答案 12 :(得分：2)
这就是我在所有.NET程序中将变音字符替换为非变音符号的方法
C＃：
//Transforms the culture of a letter to its equivalent representation in the 0-127 ascii table, such as the letter 'é' is substituted by an 'e'
public string RemoveDiacritics(string s)
{
string normalizedString = null;
StringBuilder stringBuilder = new StringBuilder();
normalizedString = s.Normalize(NormalizationForm.FormD);
int i = 0;
char c = '\0';
for (i = 0; i <= normalizedString.Length - 1; i++)
{
c = normalizedString[i];
if (CharUnicodeInfo.GetUnicodeCategory(c) != UnicodeCategory.NonSpacingMark)
{
stringBuilder.Append(c);
}
}
return stringBuilder.ToString().ToLower();
}
VB .NET：
'Transforms the culture of a letter to its equivalent representation in the 0-127 ascii table, such as the letter "é" is substituted by an "e"'
Public Function RemoveDiacritics(ByVal s As String) As String
Dim normalizedString As String
Dim stringBuilder As New StringBuilder
normalizedString = s.Normalize(NormalizationForm.FormD)
Dim i As Integer
Dim c As Char
For i = 0 To normalizedString.Length - 1
c = normalizedString(i)
If CharUnicodeInfo.GetUnicodeCategory(c) <> UnicodeCategory.NonSpacingMark Then
stringBuilder.Append(c)
End If
Next
Return stringBuilder.ToString().ToLower()
End Function
答案 13 :(得分：2)
这是VB版本（与希腊合作）：
导入System.Text
导入System.Globalization
Public Function RemoveDiacritics(ByVal s As String)
Dim normalizedString As String
Dim stringBuilder As New StringBuilder
normalizedString = s.Normalize(NormalizationForm.FormD)
Dim i As Integer
Dim c As Char
For i = 0 To normalizedString.Length - 1
c = normalizedString(i)
If CharUnicodeInfo.GetUnicodeCategory(c) <> UnicodeCategory.NonSpacingMark Then
stringBuilder.Append(c)
End If
Next
Return stringBuilder.ToString()
End Function
答案 14 :(得分：1)
Encoding.ASCII.GetString(Encoding.GetEncoding(1251).GetBytes(text));
它实际上会分割å这样的字符（字符代码00E5，不 0061加上修饰符030A看起来相同）加a加上某种修饰符，然后ASCII转换删除修饰符，留下唯一的a。
答案 15 :(得分：1)
Imports System.Text
Imports System.Globalization
Public Function DECODE(ByVal x As String) As String
Dim sb As New StringBuilder
For Each c As Char In x.Normalize(NormalizationForm.FormD).Where(Function(a) CharUnicodeInfo.GetUnicodeCategory(a) <> UnicodeCategory.NonSpacingMark)
sb.Append(c)
Next
Return sb.ToString()
End Function
答案 16 :(得分：1)
如果您还没有考虑过，请在此处弹出此库。看起来有各种各样的单元测试。
答案 17 :(得分：1)
有一种方法RemoveAccents：
public static string RemoveAccents(this string source)
{
//8 bit characters
byte[] b = Encoding.GetEncoding(1251).GetBytes(source);
// 7 bit characters
string t = Encoding.ASCII.GetString(b);
Regex re = new Regex("[^a-zA-Z0-9]=-_/");
string c = re.Replace(t, " ");
return c;
}
答案 18 :(得分：0)
我非常喜欢azrafe7提供的简洁功能代码。 所以，我已经改变了一点，将其转换为扩展方法：
public static class StringExtensions
{
public static string RemoveDiacritics(this string text)
{
const string SINGLEBYTE_LATIN_ASCII_ENCODING = "ISO-8859-8";
if (string.IsNullOrEmpty(text))
{
return string.Empty;
}
return Encoding.ASCII.GetString(
Encoding.GetEncoding(SINGLEBYTE_LATIN_ASCII_ENCODING).GetBytes(text));
}
}
答案 19 :(得分：0)
此代码对我有用：
var updatedText = text.Normalize(NormalizationForm.FormD)
.Where(c => CharUnicodeInfo.GetUnicodeCategory(c) != UnicodeCategory.NonSpacingMark)
.ToArray();
但是，请不要使用名字。这不仅是侮辱名字上有变音符号/重音符号的人，在某些情况下也可能会犯错误（见下文）。还有其他替代品，而不仅仅是消除重音。
此外，这完全是错误和危险的，例如如果用户必须提供他的名字在护照上的确切显示方式。
例如，我的名字写为Zuberbühler，在我护照的机读部分，您会找到Zuberbuehler。通过删除变音符号，该名称将与任一部分都不匹配。这可能会给用户带来麻烦。
您宁可在输入形式中禁止输入变音/重音 ，以便用户可以正确输入自己的名字而不会变音或变音。
一个实际的示例，如果要申请ESTA（https://www.application-esta.co.uk/special-characters-and）的Web服务将使用上述代码而不是正确转换变音符号，则ESTA应用程序将被拒绝，或者旅行者将在以下情况下遇到美国边境管制局的问题进入美国。
另一个例子是机票。假设您有一个机票预订Web应用程序，该用户为他的名字提供一个重音符号，而您的实现只是删除重音符号，然后使用航空公司的Web服务预订机票！您的客户名称可能与护照的任何部分都不匹配，因此可能不允许您登机。
答案 20 :(得分：0)
与接受的答案相同但速度更快，使用 Span 而不是 StringBuilder。
需要 .NET Core 3.1 或更新的 .NET。
static string RemoveDiacritics(string text)
{
ReadOnlySpan<char> normalizedString = text.Normalize(NormalizationForm.FormD);
int i = 0;
Span<char> span = text.Length < 1000
? stackalloc char[text.Length]
: new char[text.Length];
foreach (char c in normalizedString)
{
if (CharUnicodeInfo.GetUnicodeCategory(c) != UnicodeCategory.NonSpacingMark)
span[i++] = c;
}
return new string(span).Normalize(NormalizationForm.FormC);
}
此外，这也可扩展用于其他字符替换，例如用于波兰语Ł。
span[i++] = c switch
{
'Ł' = 'L',
'ł' => 'l',
_ => c
};
一个小提示：堆栈分配 stackalloc 比堆分配 new 快，并且它对垃圾收集器的工作更少。 1000 是避免在 Stack 上分配可能导致 StackOverflowException 的大型结构的阈值。虽然 1000 是一个相当安全的值，但在大多数情况下，10000 甚至 100000 也可以工作（100k 在堆栈上分配最多 200kB，而默认堆栈大小为 1 MB），但是 100k 看起来有点危险。
答案 21 :(得分：-1)
没有足够的声誉，显然我无法评论亚历山大的出色联系。 -Lucene似乎是在一般情况下适用的唯一解决方案。
对于那些想要简单复制粘贴解决方案的人，这里就是利用Lucene中的代码：
字符串测试床=“ ÁÁÄÅÅÇÉÍÎÓÖØÚÜÞàáâãäåæçèéêëëëëëëëëððóóöøúüăăčĐęğıŁłńŌōřŞşšźžșțệủ”；
Console.WriteLine（Lucene.latinizeLucene（testbed））;
AAAACEIIOOOUUTHaaaaaaaeceeeeeeiiiidnoooouuaacDegiLlnOorSsszzsteu
//////////
public static class Lucene
{
// source: https://raw.githubusercontent.com/apache/lucenenet/master/src/Lucene.Net.Analysis.Common/Analysis/Miscellaneous/ASCIIFoldingFilter.cs
// idea: https://stackoverflow.com/questions/249087/how-do-i-remove-diacritics-accents-from-a-string-in-net (scroll down, search for lucene by Alexander)
public static string latinizeLucene(string arg)
{
char[] argChar = arg.ToCharArray();
// latinizeLuceneImpl can expand one char up to four chars - e.g. Þ to TH, or æ to ae, or in fact ⑽ to (10)
char[] resultChar = new String(' ', arg.Length * 4).ToCharArray();
int outputPos = Lucene.latinizeLuceneImpl(argChar, 0, ref resultChar, 0, arg.Length);
string ret = new string(resultChar);
ret = ret.Substring(0, outputPos);
return ret;
}
/// <summary>
/// Converts characters above ASCII to their ASCII equivalents. For example,
/// accents are removed from accented characters.
/// <para/>
/// @lucene.internal
/// </summary>
/// <param name="input"> The characters to fold </param>
/// <param name="inputPos"> Index of the first character to fold </param>
/// <param name="output"> The result of the folding. Should be of size >= <c>length * 4</c>. </param>
/// <param name="outputPos"> Index of output where to put the result of the folding </param>
/// <param name="length"> The number of characters to fold </param>
/// <returns> length of output </returns>
private static int latinizeLuceneImpl(char[] input, int inputPos, ref char[] output, int outputPos, int length)
{
int end = inputPos + length;
for (int pos = inputPos; pos < end; ++pos)
{
char c = input[pos];
// Quick test: if it's not in range then just keep current character
if (c < '\u0080')
{
output[outputPos++] = c;
}
else
{
switch (c)
{
case '\u00C0': // À [LATIN CAPITAL LETTER A WITH GRAVE]
case '\u00C1': // Á [LATIN CAPITAL LETTER A WITH ACUTE]
case '\u00C2': // Â [LATIN CAPITAL LETTER A WITH CIRCUMFLEX]
case '\u00C3': // Ã [LATIN CAPITAL LETTER A WITH TILDE]
case '\u00C4': // Ä [LATIN CAPITAL LETTER A WITH DIAERESIS]
case '\u00C5': // Å [LATIN CAPITAL LETTER A WITH RING ABOVE]
case '\u0100': // Ā [LATIN CAPITAL LETTER A WITH MACRON]
case '\u0102': // Ă [LATIN CAPITAL LETTER A WITH BREVE]
case '\u0104': // Ą [LATIN CAPITAL LETTER A WITH OGONEK]
case '\u018F': // Ə http://en.wikipedia.org/wiki/Schwa [LATIN CAPITAL LETTER SCHWA]
case '\u01CD': // Ǎ [LATIN CAPITAL LETTER A WITH CARON]
case '\u01DE': // Ǟ [LATIN CAPITAL LETTER A WITH DIAERESIS AND MACRON]
case '\u01E0': // Ǡ [LATIN CAPITAL LETTER A WITH DOT ABOVE AND MACRON]
case '\u01FA': // Ǻ [LATIN CAPITAL LETTER A WITH RING ABOVE AND ACUTE]
case '\u0200': // Ȁ [LATIN CAPITAL LETTER A WITH DOUBLE GRAVE]
case '\u0202': // Ȃ [LATIN CAPITAL LETTER A WITH INVERTED BREVE]
case '\u0226': // Ȧ [LATIN CAPITAL LETTER A WITH DOT ABOVE]
case '\u023A': // Ⱥ [LATIN CAPITAL LETTER A WITH STROKE]
case '\u1D00': // ᴀ [LATIN LETTER SMALL CAPITAL A]
case '\u1E00': // Ḁ [LATIN CAPITAL LETTER A WITH RING BELOW]
case '\u1EA0': // Ạ [LATIN CAPITAL LETTER A WITH DOT BELOW]
case '\u1EA2': // Ả [LATIN CAPITAL LETTER A WITH HOOK ABOVE]
case '\u1EA4': // Ấ [LATIN CAPITAL LETTER A WITH CIRCUMFLEX AND ACUTE]
case '\u1EA6': // Ầ [LATIN CAPITAL LETTER A WITH CIRCUMFLEX AND GRAVE]
case '\u1EA8': // Ẩ [LATIN CAPITAL LETTER A WITH CIRCUMFLEX AND HOOK ABOVE]
case '\u1EAA': // Ẫ [LATIN CAPITAL LETTER A WITH CIRCUMFLEX AND TILDE]
case '\u1EAC': // Ậ [LATIN CAPITAL LETTER A WITH CIRCUMFLEX AND DOT BELOW]
case '\u1EAE': // Ắ [LATIN CAPITAL LETTER A WITH BREVE AND ACUTE]
case '\u1EB0': // Ằ [LATIN CAPITAL LETTER A WITH BREVE AND GRAVE]
case '\u1EB2': // Ẳ [LATIN CAPITAL LETTER A WITH BREVE AND HOOK ABOVE]
case '\u1EB4': // Ẵ [LATIN CAPITAL LETTER A WITH BREVE AND TILDE]
case '\u1EB6': // Ặ [LATIN CAPITAL LETTER A WITH BREVE AND DOT BELOW]
case '\u24B6': // Ⓐ [CIRCLED LATIN CAPITAL LETTER A]
case '\uFF21': // Ａ [FULLWIDTH LATIN CAPITAL LETTER A]
output[outputPos++] = 'A';
break;
case '\u00E0': // à [LATIN SMALL LETTER A WITH GRAVE]
case '\u00E1': // á [LATIN SMALL LETTER A WITH ACUTE]
case '\u00E2': // â [LATIN SMALL LETTER A WITH CIRCUMFLEX]
case '\u00E3': // ã [LATIN SMALL LETTER A WITH TILDE]
case '\u00E4': // ä [LATIN SMALL LETTER A WITH DIAERESIS]
case '\u00E5': // å [LATIN SMALL LETTER A WITH RING ABOVE]
case '\u0101': // ā [LATIN SMALL LETTER A WITH MACRON]
case '\u0103': // ă [LATIN SMALL LETTER A WITH BREVE]
case '\u0105': // ą [LATIN SMALL LETTER A WITH OGONEK]
case '\u01CE': // ǎ [LATIN SMALL LETTER A WITH CARON]
case '\u01DF': // ǟ [LATIN SMALL LETTER A WITH DIAERESIS AND MACRON]
case '\u01E1': // ǡ [LATIN SMALL LETTER A WITH DOT ABOVE AND MACRON]
case '\u01FB': // ǻ [LATIN SMALL LETTER A WITH RING ABOVE AND ACUTE]
case '\u0201': // ȁ [LATIN SMALL LETTER A WITH DOUBLE GRAVE]
case '\u0203': // ȃ [LATIN SMALL LETTER A WITH INVERTED BREVE]
case '\u0227': // ȧ [LATIN SMALL LETTER A WITH DOT ABOVE]
case '\u0250': // ɐ [LATIN SMALL LETTER TURNED A]
case '\u0259': // ə [LATIN SMALL LETTER SCHWA]
case '\u025A': // ɚ [LATIN SMALL LETTER SCHWA WITH HOOK]
case '\u1D8F': // ᶏ [LATIN SMALL LETTER A WITH RETROFLEX HOOK]
case '\u1D95': // ᶕ [LATIN SMALL LETTER SCHWA WITH RETROFLEX HOOK]
case '\u1E01': // ạ [LATIN SMALL LETTER A WITH RING BELOW]
case '\u1E9A': // ả [LATIN SMALL LETTER A WITH RIGHT HALF RING]
case '\u1EA1': // ạ [LATIN SMALL LETTER A WITH DOT BELOW]
case '\u1EA3': // ả [LATIN SMALL LETTER A WITH HOOK ABOVE]
case '\u1EA5': // ấ [LATIN SMALL LETTER A WITH CIRCUMFLEX AND ACUTE]
case '\u1EA7': // ầ [LATIN SMALL LETTER A WITH CIRCUMFLEX AND GRAVE]
case '\u1EA9': // ẩ [LATIN SMALL LETTER A WITH CIRCUMFLEX AND HOOK ABOVE]
case '\u1EAB': // ẫ [LATIN SMALL LETTER A WITH CIRCUMFLEX AND TILDE]
case '\u1EAD': // ậ [LATIN SMALL LETTER A WITH CIRCUMFLEX AND DOT BELOW]
case '\u1EAF': // ắ [LATIN SMALL LETTER A WITH BREVE AND ACUTE]
case '\u1EB1': // ằ [LATIN SMALL LETTER A WITH BREVE AND GRAVE]
case '\u1EB3': // ẳ [LATIN SMALL LETTER A WITH BREVE AND HOOK ABOVE]
case '\u1EB5': // ẵ [LATIN SMALL LETTER A WITH BREVE AND TILDE]
case '\u1EB7': // ặ [LATIN SMALL LETTER A WITH BREVE AND DOT BELOW]
case '\u2090': // ₐ [LATIN SUBSCRIPT SMALL LETTER A]
case '\u2094': // ₔ [LATIN SUBSCRIPT SMALL LETTER SCHWA]
case '\u24D0': // ⓐ [CIRCLED LATIN SMALL LETTER A]
case '\u2C65': // ⱥ [LATIN SMALL LETTER A WITH STROKE]
case '\u2C6F': // Ɐ [LATIN CAPITAL LETTER TURNED A]
case '\uFF41': // ａ [FULLWIDTH LATIN SMALL LETTER A]
output[outputPos++] = 'a';
break;
case '\uA732': // Ꜳ [LATIN CAPITAL LETTER AA]
output[outputPos++] = 'A';
output[outputPos++] = 'A';
break;
case '\u00C6': // Æ [LATIN CAPITAL LETTER AE]
case '\u01E2': // Ǣ [LATIN CAPITAL LETTER AE WITH MACRON]
case '\u01FC': // Ǽ [LATIN CAPITAL LETTER AE WITH ACUTE]
case '\u1D01': // ᴁ [LATIN LETTER SMALL CAPITAL AE]
output[outputPos++] = 'A';
output[outputPos++] = 'E';
break;
case '\uA734': // Ꜵ [LATIN CAPITAL LETTER AO]
output[outputPos++] = 'A';
output[outputPos++] = 'O';
break;
case '\uA736': // Ꜷ [LATIN CAPITAL LETTER AU]
output[outputPos++] = 'A';
output[outputPos++] = 'U';
break;
// etc. etc. etc.
// see link above for complete source code
//
// unfortunately, postings are limited, as in
// "Body is limited to 30000 characters; you entered 136098."
[...]
case '\u2053': // ⁓ [SWUNG DASH]
case '\uFF5E': // ～ [FULLWIDTH TILDE]
output[outputPos++] = '~';
break;
default:
output[outputPos++] = c;
break;
}
}
}
return outputPos;
}
}