由于错误“引用未声明的实体'，XmlDocument无法加载XHTML字符串”

Question

我使用以下代码将HTTP响应流转换为XmlDocument。

HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
Stream responseStream = response.GetResponseStream();
StreamReader responseReader = new StreamReader(responseStream);
String responseString = responseReader.ReadToEnd();
Console.WriteLine(responseString);
Int32 htmlTagIndex = responseString.IndexOf("<html",
   StringComparison.OrdinalIgnoreCase);
XmlDocument responseXhtml = new XmlDocument();
responseString = responseString.Substring(htmlTagIndex); // MARK 1
responseString = responseString.Replace("&nbsp", " "); // MARK 2
responseXhtml.LoadXml(responseString);
return responseXhtml;

MARK 1 行将跳过DOC类型定义行。

MARK 2 行是为了避免错误引用未声明的实体。

有没有更好的方法呢？上面的代码中有太多的字符串操作。

谢谢！

Answer 1

我会直接使用HtmlAgilityPack来解析html。即使您必须将html转换为xml，也可以使用它。

using (WebClient wc = new WebClient())
{
    HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
    doc.LoadHtml(wc.DownloadString("http://www.google.com"));
    doc.OptionOutputAsXml = true;

    StringWriter writer = new StringWriter();
    doc.Save(writer);

    var xDoc = XDocument.Load(new StringReader(writer.ToString()));
}