如何在C#中将HTML字符串转换成XHTML？

using HtmlAgilityPack;

public string ConvertHtmlToXhtml(string htmlString)
{
    // 创建HtmlDocument对象
    HtmlDocument htmlDoc = new HtmlDocument();

    // 加载HTML字符串
    htmlDoc.LoadHtml(htmlString);

    // 创建StringBuilder对象，用于保存转换后的XHTML字符串
    StringBuilder xhtmlBuilder = new StringBuilder();

    // 使用HtmlTextWriter将XHTML写入StringBuilder
    using (StringWriter writer = new StringWriter(xhtmlBuilder))
    {
        using (HtmlTextWriter htmlWriter = new HtmlTextWriter(writer))
        {
            // 将HtmlDocument对象写入HtmlTextWriter，实现转换
            htmlDoc.Save(htmlWriter);
        }
    }

    // 返回转换后的XHTML字符串
    return xhtmlBuilder.ToString();
}

Install-Package HtmlAgilityPack