c# – HTMl敏捷包错误解析并返回XElement

我可以解析文档并生成输出,但是由于p标记,输出无法解析为XElement,字符串中的所有其他内容都会被正确解析.

我的意见：

var input = "<p> Not sure why is is null for some wierd reason!<br><br>I have implemented the auto save feature,but does it really work after 100s?<br></p> <p> <i>Autosave?? </i> </p> <p>we are talking...</p><p></p><hr><p><br class=\"GENTICS_ephemera\"></p>";

我的代码：

public static XElement CleanupHtml(string input)
    {  


    HtmlAgilityPack.HtmlDocument htmlDoc = new HtmlAgilityPack.HtmlDocument();

    htmlDoc.OptionOutputAsXml = true;
    //htmlDoc.OptionWriteEmptyNodes = true;             
    //htmlDoc.OptionAutoCloSEOnEnd = true;
    htmlDoc.OptionFixnestedTags = true;

    htmlDoc.LoadHtml(input);

    // ParseErrors is an ArrayList containing any errors from the Load statement
    if (htmlDoc.ParseErrors != null && htmlDoc.ParseErrors.Count() > 0)
    {

    }
    else
    {

        if (htmlDoc.DocumentNode != null)
        {
            var ndoc = new HtmlDocument(); // HTML doc instance
            HtmlNode p = ndoc.CreateElement("body");  

            p.InnerHtml = htmlDoc.DocumentNode.InnerHtml;
            var result = p.OuterHtml.Replace("<br>","<br/>");
            result = result.Replace("<br class=\"special_class\">","<br/>");
            result = result.Replace("<hr>","<hr/>");
            return XElement.Parse(result,LoadOptions.PreserveWhitespace);
        }
    }
    return new XElement("body");

}

我的输出：

<body>
   <p> Not sure why is is null for some wierd reason chappy!
   <br/>
   <br/>I have implemented the auto save feature,but does it really work after 100s?
   <br/>
   </p> 
   <p> 
   <i>Autosave?? </i> 
   </p> 
   <p>we are talking...</p>
   **<p>**
   <hr/>
   <p>
   <br/>
   </p>
</body>

粗体p标签是没有正确输出的标签……有没有办法解决这个问题？我做错了代码吗？

解决方法

你要做的是基本上将Html输入转换为Xml输出.

当你使用OptionOutputAsXml选项时,Html Agility Pack可以做到这一点,但在这种情况下,你不应该使用InnerHtml属性,而是让Html Agility Pack为你做好基础工作,使用HtmlDocument的Save方法之一.

这是一个将Html文本转换为XElement实例的通用函数：

public static XElement HtmlToXElement(string html)
{
    if (html == null)
        throw new ArgumentNullException("html");

    HtmlDocument doc = new HtmlDocument();
    doc.OptionOutputAsXml = true;
    doc.LoadHtml(html);
    using (StringWriter writer = new StringWriter())
    {
        doc.Save(writer);
        using (StringReader reader = new StringReader(writer.ToString()))
        {
            return XElement.Load(reader);
        }
    }
}

如您所见,您不必自己做太多工作！请注意,由于您的原始输入文本没有根元素,Html Agility Pack将自动添加一个封闭的SPAN以确保输出有效Xml.

在你的情况下,你想要另外处理一些标签,所以,这里是如何处理你的例子：

public static XElement CleanupHtml(string input)
    {
        if (input == null)
            throw new ArgumentNullException("input");

        HtmlDocument doc = new HtmlDocument();
        doc.OptionOutputAsXml = true;
        doc.LoadHtml(input);

        // extra processing,remove some attributes using DOM
        HtmlNodeCollection coll = doc.DocumentNode.SelectNodes("//br[@class='special_class']");
        if (coll != null)
        {
            foreach (HtmlNode node in coll)
            {
                node.Attributes.Remove("class");
            }
        }

        using (StringWriter writer = new StringWriter())
        {
            doc.Save(writer);
            using (StringReader reader = new StringReader(writer.ToString()))
            {
                return XElement.Load(reader);
            }
        }
    }

如您所见,您不应该使用原始字符串函数,而是使用Html Agility Pack DOM函数(SelectNodes,Add,Remove等等).

c# – HTMl敏捷包错误解析并返回XElement

解决方法

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