Question

c＃我需要帮助将管道字符中的单词解析为字符串列表。

“您可以在办理入住前免费取消直到| 720 |。如果在办理入住前在| 720 |中取消，则需要支付| 407.74USD |。”

字符串列表应包含两个项目。 720和407.74美元。

谢谢

Answer 1

private static IEnumerable<string> GetStringsBetweenDelimiters(string str, char delimiter)
{
    int openingIndex = default; //index of the opening delimiter
    int closingIndex = -1; //starts from -1 as otherwise it would not work for string
                           //starting with delimiter

    while (true)
    {
        openingIndex = str.IndexOf(delimiter, closingIndex + 1);
        //it has to be +1'd as otherwise it would return closingIndex
        if (openingIndex < 0) yield break; //No more delimiters
        closingIndex = str.IndexOf(delimiter, openingIndex + 1);
        //+1'd for same reason as above
        if (closingIndex < 0) //No closing delimiter
            throw new InvalidOperationException("The given string has odd number of delimiters.");
        //Might just break as well?

        yield return str.Substring(openingIndex + 1, closingIndex - openingIndex - 1);
    }
}

像GetStringsBetweenDelimiters(str, '|')那样调用时，此方法仅返回两个管道字符之间的值。此方法相对于string.Split（delimiter）的优势在于，它不会分配不在竖线字符（You can cancel free of charge until，before check-in. You’ll be charged ...）之间的不必要的子字符串，这可能会更简单使用。

测试：

foreach (string str in GetStringBetweenDelimiters(testStr, '|'))
{
    Console.WriteLine(str);
}

打印

720
407.74USD
720

在字符串中解析管道内的文本

1 个答案: