C＃string comparision’？’

C# string comparision '?' 'oe' 'o'

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how to recognize similar words with difference in spelling

在比较这3个字符串时，我试图返回true："voest"、"vost"和"v"？(德国文化)，因为它是同一个词。(实际上，只有oE和？是相同的，但例如，对于数据库排序规则CI，正确的是相同的，因为"vost"是错误输入的"voest")。

无论我为该方法提供什么参数，compare(..)/string.equals(..)始终返回false。

如何使string.compare()/等于(..)返回true？

相关讨论

您可以创建一个忽略umlauts的自定义比较器：

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class IgnoreUmlautComparer : IEqualityComparer<string>
{
Dictionary<char, char> umlautReplacer = new Dictionary<char, char>()
{
{'?','a'}, {'?','A'},
{'?','o'}, {'?','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();
}
}

现在您可以将此比较器与Enumerable方法(如Distinct方法)一起使用：

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