c# - 测量包含宽字符的字符串的长度

Question

我有以下字符串:

友𠂇又

对应的UTF-16表示(little-endian)是

CB 53 40 D8 87 DC C8 53
\___/ \_________/ \___/
  友       𠂇       又

"友𠂇又".Length 返回 4，因为 CLR 将字符串存储为 4 个 2 字节字符。

如何测量绳子的长度？如何将其拆分为 { "友", "𠂇", "又"}？

Answer 1

作为documented :

The Length property returns the number of Char objects in this instance, not the number of Unicode characters. The reason is that a Unicode character might be represented by more than one Char. Use the System.Globalization.StringInfo class to work with each Unicode character instead of each Char.

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获取长度:

new System.Globalization.StringInfo("友𠂇又").LengthInTextElements

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获取每个Unicode字符是documented here , 但做一个扩展方法更方便:

public static IEnumerable<string> TextElements(this string s) {
    var en = System.Globalization.StringInfo.GetTextElementEnumerator(s);

    while (en.MoveNext())
    {
        yield return en.GetTextElement();
    }
}

并在 foreach 或 LINQ 语句中使用它:

foreach (string segment in "友𠂇又".TextElements())
{
    Console.WriteLine(segment);
}

也可用于长度:

Console.WriteLine("友𠂇又".TextElements().Count());