我正在尝试转换一些法语加拿大语的字符串，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标记。（例如转换é为e，所以crème brûlée会变成creme brulee）
实现这一目标的最佳方法是什么？
James Hall
问问题
257907 次
20 回答
597
我没有使用过这种方法，但 Michael Kaplan 在他的博客文章（标题令人困惑）中描述了一种这样做的方法，其中谈到了剥离变音符号：是无间距的，但有些比其他的更无间距）
static string RemoveDiacritics(string text)
{
var normalizedString = text.Normalize(NormalizationForm.FormD);
var stringBuilder = new StringBuilder(capacity: normalizedString.Length);
for (int i = 0; i < normalizedString.Length; i++)
{
char c = normalizedString[i];
var unicodeCategory = CharUnicodeInfo.GetUnicodeCategory(c);
if (unicodeCategory != UnicodeCategory.NonSpacingMark)
{
stringBuilder.Append(c);
}
}
return stringBuilder
.ToString()
.Normalize(NormalizationForm.FormC);
}
请注意，这是他之前的帖子的后续内容：剥离变音符号....
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。这只是有点复杂，但实际上你正在寻找一个复杂的问题。
当然，如果您将自己限制在法语，您可能会按照@David Dibben 的建议，在如何删除 C++ std::string 中的重音符号和波浪号中使用简单的基于表格的方法。
于 2008-10-30T02:29:01.240 回答
204
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&短！
于 2010-01-18T14:16:44.353 回答
38
我需要一些可以转换所有主要 unicode 字符的东西，而投票的答案遗漏了一些，所以我创建了一个 CodeIgniter 的convert_accented_characters($str)C# 版本，它很容易定制：
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;
}
}
用法
// for strings
"crème brûlée".RemoveDiacritics (); // creme brulee
// for chars
"Ã"[0].RemoveDiacritics (); // A
于 2015-12-14T16:46:33.917 回答
35
如果有人感兴趣，我正在寻找类似的东西并结束写以下内容：
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
}
于 2009-04-23T08:32:00.680 回答
16
我经常使用基于我在这里找到的另一个版本的扩展方法（请参阅Replacing characters in C# (ascii)）快速解释：
- 规范化以形成 D 将è等字符拆分为e和非间距`
- 从这里，nospacing 字符被删除
- 结果被归一化回形式 C（我不确定这是否必要）
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);
}
}
于 2012-10-31T10:05:38.013 回答
13
希腊语 (ISO)的 CodePage可以做到
有关此代码页的信息位于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) 的代码页为 28597，名称为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")));
}
注意...Encoding.GetEncoding("iso-8859-7")等价于Encoding.GetEncoding(28597)因为 first 是名称，其次是 Encoding 的代码页。
于 2016-08-05T01:46:49.567 回答
8
TL;DR - C# 字符串扩展方法
我认为保留字符串含义的最佳解决方案是将字符转换而不是剥离它们，这在示例中很好地说明crème brûlée了crme brlevs. creme brulee。
我查看了上面 Alexander 的评论，发现 Lucene.Net 代码是 Apache 2.0 许可的，所以我将这个类修改为一个简单的字符串扩展方法。你可以像这样使用它：
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，无法在 StackOverflow 答案中发布（允许 30k 的约 139k 个字符，哈哈），所以我做了一个要点并归因于作者：
/*
* 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
}
}
希望对其他人有所帮助，这是我找到的最强大的解决方案！
于 2019-06-27T19:33:43.437 回答
6
有趣的是，这样的问题可以得到这么多答案，但没有一个符合我的要求:) 周围有这么多语言，AFAIK 不可能实现完整的语言不可知论解决方案，因为其他人提到 FormC 或 FormD 正在给出问题。
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
public static string ConvertWesternEuropeanToASCII(this string str)
{
return Encoding.ASCII.GetString(Encoding.GetEncoding(1251).GetBytes(str));
}
1251 应替换为输入语言的编码代码。
然而，这仅用一个字符替换一个字符。由于我还使用德语作为输入，因此我进行了手动转换
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();
}
它可能无法提供最佳性能，但至少它非常易于阅读和扩展。正则表达式是不行的，比任何字符/字符串的东西都要慢得多。
我还有一个非常简单的删除空间的方法：
public static string RemoveSpace(this string str)
{
return str.Replace(" ", string.Empty);
}
最终，我使用了上述所有 3 个扩展的组合：
public static string LatinizeAndConvertToASCII(this string str, bool keepSpace = false)
{
str = str.LatinizeGermanCharacters().ConvertWesternEuropeanToASCII();
return keepSpace ? str : str.RemoveSpace();
}
以及一个成功通过的小单元测试（不是详尽的）。
[TestMethod()]
public void LatinizeAndConvertToASCIITest()
{
string europeanStr = "Bonjour ça va? C'est l'été! Ich möchte ä Ä á à â ê é è ë Ë É ï Ï î í ì ó ò ô ö Ö Ü ü ù ú û Û ý Ý ç Ç ñ Ñ";
string expected = "Bonjourcava?C'estl'ete!IchmoechteaeAeaaaeeeeEEiIiiiooooeOeUeueuuuUyYcCnN";
string actual = europeanStr.LatinizeAndConvertToASCII();
Assert.AreEqual(expected, actual);
}
于 2017-02-06T13:19:11.337 回答
4
公认的答案是完全正确的，但现在应该更新它以使用Rune类而不是CharUnicodeInfo.NET，因为 C# 和 .NET 更新了最新版本中分析字符串的方式（.NET Core 3.0 中添加了 Rune 类）。
现在推荐使用 .NET 5+ 的以下代码，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);
}
于 2021-05-17T12:40:09.423 回答
3
这是 VB 版本（适用于希腊语）：
导入 System.Text
进口系统.全球化
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
于 2010-07-28T13:21:20.587 回答
3
这就是我在所有 .NET 程序中将变音符号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
于 2013-08-01T18:55:31.563 回答
3
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。
于 2017-05-21T21:10:25.160 回答
2
有一个方法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;
}
于 2013-05-03T02:25:24.463 回答
1
您可以使用 MMLib.Extensions nuget 包中的字符串扩展名：
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 项目站点https://mmlib.codeplex.com/
于 2013-12-30T10:25:13.883 回答
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
于 2015-06-22T13:34:46.837 回答
1
Encoding.ASCII.GetString(Encoding.GetEncoding(1251).GetBytes(text));
它实际上将å其中一个字符（即字符代码00E5，而不是 看起来相同0061的修饰符）拆分为plus 某种修饰符，然后 ASCII 转换删除修饰符，留下唯一的.030Aaa
于 2015-12-11T17:09:47.823 回答
1
我真的很喜欢azrafe7提供的简洁实用的代码。因此，我对其进行了一些更改以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));
}
}
于 2017-02-14T18:54:17.283 回答
1
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);
}
这也可以扩展为额外的字符替换，例如波兰语Ł。
span[i++] = c switch
{
'Ł' = 'L',
'ł' => 'l',
_ => c
};
一个小提示：堆栈分配stackalloc比堆分配要快new，它减少了垃圾收集器的工作。1000是避免在 Stack 上分配大型结构的阈值，这可能会导致StackOverflowException. 虽然 1000 是一个非常安全的值，但在大多数情况下，10000 甚至 100000 也可以工作（100k 在堆栈上分配高达 200kB，而默认堆栈大小为 1 MB），但是 100k 对我来说有点危险。
于 2021-04-21T06:09:41.603 回答
0
这段代码对我有用：
var updatedText = text.Normalize(NormalizationForm.FormD)
.Where(c => CharUnicodeInfo.GetUnicodeCategory(c) != UnicodeCategory.NonSpacingMark)
.ToArray();
但是，请不要对名称执行此操作。这不仅是对名字中带有元音变音/口音的人的侮辱，在某些情况下也可能是危险的错误（见下文）。有替代的写作，而不是仅仅去除口音。
此外，这完全是错误和危险的，例如，如果用户必须准确地提供他的姓名在护照上的出现方式。
例如，我的名字写Zuberbühler在我护照的机器可读部分，你会发现Zuberbuehler。通过删除变音符号，名称将不匹配任何部分。这可能会给用户带来问题。
您应该在名称的输入表单中禁止使用元音变音/重音，这样用户就可以正确地写出他的名字而没有元音变音或重音。
实际示例，如果申请 ESTA 的 Web 服务 ( https://www.application-esta.co.uk/special-characters-and ) 将使用上述代码而不是正确转换元音变音，则 ESTA 申请将被拒绝或旅行者在进入美国时会遇到美国边境管制局的问题。
另一个例子是机票。假设您有一个机票预订 Web 应用程序，用户为他的名字提供了一个重音符号，而您的实现只是删除重音符号，然后使用航空公司的 Web 服务来预订机票！您的客户可能不被允许登机，因为姓名与他/她护照的任何部分都不匹配。
于 2020-09-03T17:45:14.720 回答
-5
没有足够的声誉，显然我无法评论亚历山大的优秀链接。- Lucene 似乎是在合理通用情况下工作的唯一解决方案。
对于那些想要一个简单的复制粘贴解决方案的人来说，这里是利用 Lucene 中的代码：
string testbed = "ÁÂÄÅÇÉÍÎÓÖØÚÜÞàáââãäåæçèééêëìíïïðñóôöøúüāăčĐęğıŁłńŌōřŞşšźžşşệủ";
Console.WriteLine(Lucene.latinizeLucene(testbed));
啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊
//////////
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;
}
}
于 2019-04-13T21:19:05.707 回答