C＃字符串比较'ö' 'oe' 'o' [复制]

2 回答

• 3

  您可以在比较中尝试IgnoreNonSpace选项 . 它不会解决voest - vost，但会对vost-vöst有所帮助 .

  int a = new CultureInfo("de-DE").CompareInfo.Compare("vost", "vöst", CompareOptions.IgnoreNonSpace);
  // a = 0; strings are equal.
  

  回复于 2024-05-05T11:58:23+08:00
• 0

  您可以创建一个忽略变音符号的自定义比较器：

  class IgnoreUmlautComparer : IEqualityComparer<string>
  {
      Dictionary<char, char> umlautReplacer = new Dictionary<char, char>()
      {
          {'ä','a'}, {'Ä','A'},
          {'ö','o'}, {'Ö','O'},
          {'ü','u'}, {'Ü','U'},
      };
      Dictionary<string, string> pseudoUmlautReplacer = new Dictionary<string, string>()
      {
          {"ae","a"}, {"Ae","A"},
          {"oe","o"}, {"Oe","O"},
          {"ue","u"}, {"Ue","U"},
      };
  
      private IEnumerable<char> ignoreUmlaut(string s)
      {
          char value;
          string replaced = new string(s.Select(c => umlautReplacer.TryGetValue(c, out value) ? value : c).ToArray());
          foreach (var kv in pseudoUmlautReplacer)
              replaced = replaced.Replace(kv.Key, kv.Value);
          return replaced;
      }
  
      public bool Equals(string x, string y)
      {
          var xChars = ignoreUmlaut(x);
          var yChars = ignoreUmlaut(y);
          return xChars.SequenceEqual(yChars);
      }
  
      public int GetHashCode(string obj)
      {
          return ignoreUmlaut(obj).GetHashCode();
      }
  }
  

  现在你可以使用这个比较器和 Enumerable 方法，如Distinct：

  string[] allStrings = new[]{"voest","vost","vöst"};
  bool allEqual = allStrings.Distinct(new IgnoreUmlautComparer()).Count() == 1;
  // --> true
  

  回复于 2024-05-05T11:58:23+08:00