在 C# 中如何更好地解析此 html 内容？

您正在寻找的正则表达式模式是<A HREF="\/(\d\.\d\.\d{5})\/">，即捕获一个<A HREF="">. 此模式的正则表达式 101。

提取这些字符串后，将它们解析为一个VersionNumber类。该类通过IComparable接口实现比较。这确保 VersionNumbers 可以正确排序OrderBy。

public class VersionNumber : IComparable {

    public int Major    { get; set; }
    public int Minor    { get; set; }
    public int Revision { get; set; }

    // Converts string to VersionNumber object
    public static VersionNumber Parse(string s) {
        if (string.IsNullOrWhiteSpace(s)) {
            throw new ArgumentNullException(nameof(s));
        }

        var parts = s.Split(new [] {'.'});
        if (parts.Count() != 3) {
            throw new ArgumentException("Input string must be in format 'X.Y.ZZZZZ'.");
        }

        var result = new VersionNumber();
        try {
            result.Major    = int.Parse(parts[0]);
            result.Minor    = int.Parse(parts[1]);
            result.Revision = int.Parse(parts[2]);
        }
        catch (FormatException) {
            throw new ArgumentException("Input string must be in format 'X.Y.ZZZZZ', with X, Y, Z integers.");
        }

        return result;
    }

    // Compares two VersionNumbers
    public int CompareTo(object obj) {
        if (obj == null) return 1;

        VersionNumber otherVersion = obj as VersionNumber;
        if (otherVersion == null) {
            throw new ArgumentException($"Object is not a {nameof(VersionNumber)}.");
        }

        // start comparison with Major Version, then Minor, then Revision
        var result = Major.CompareTo(otherVersion.Major);
        if (result == 0) {
            result = Minor.CompareTo(otherVersion.Minor);
        }
        if (result == 0) {
            result = Revision.CompareTo(otherVersion.Revision);
        }
        return result;
    }

    public override string ToString() {
         return Major + "." + Minor + "." + Revision;
    }
}

另请参阅此.Net Fiddle示例用法：

string[] versionStrings = new [] {"3.5.25569", "2.5.25557", "2.5.25580", "2.5.25569", "2.4.25569"};
// parsing
IEnumerable<VersionNumber> versions = versionStrings.Select(s => VersionNumber.Parse(s));
// sorting
IOrderedEnumerable<VersionNumber> sorted = versions.OrderBy(v => v);
// sorted: 2.4.25569, 2.5.25557, 2.5.25569, 2.5.25580, 3.5.25569