功能：
1、轻松获取指元素HTML元素。
2、可以根据属性标签进行筛选
3、返回的都是Llist强类型无需转换
用过XElement的都知道 用来解析XML非常的方便，但是对于HTML的格式多样化实在是没办法兼容。
所以我就写了这么一个类似XElement的 XHTMLElement
用法：
string filePath = Server.MapPath("~/file/test.htm");
//获取HTML代码
string mailBody = FileHelper.FileToString(filePath);
XHtmlElement xh = new XHtmlElement(mailBody);
//获取body的子集a标签并且class="icon"
var link = xh.Descendants("body").ChildDescendants("a").Where(c => c.Attributes.Any(a => a.Key == "class" && a.Value == "icon")).ToList();
//获取带href的a元素
var links = xh.Descendants("a").Where(c => c.Attributes.Any(a => a.Key == "href")).ToList();
foreach (var r in links)
{
Response.Write(r.Attributes.Single(c => c.Key == "href").Value); //出输href
}
//获取第一个img
var img = xh.Descendants("img");
//获取最近的第一个p元素以及与他同一级的其它p元素
var ps = xh.Descendants("p");
代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Text;
using System.Text.Regularexpressions;
namespace SyntacticSugar
{
///
/// ** 描述：html解析类
/// ** 创始时间：2015-4-23
/// ** 修改时间：-
/// ** 作者：sunkaixuan
/// ** qq：610262374 欢迎交流,共同提高 ,命名语法等写的不好的地方欢迎大家的给出宝贵建议
///
public class XHtmlElement
{
private string _html;
public XHtmlElement(string html)
{
_html = html;
}
///
/// 获取最近的相同层级的HTML元素
///
/// 等于null为所有元素
/// Descendants(string elementName = null)
{
if (_html == null)
{
throw new ArgumentNullException("html不能这空！");
}
var allList = RootDescendants(_html);
var reval = allList.Where(c => elementName == null || c.TagName.ToLower() == elementName.ToLower()).ToList();
if (reval == null || reval.Count == 0)
{
reval = GetDescendantsSource(allList, elementName);
}
return reval;
}
///
/// 获取第一级元素
///
///
/// RootDescendants(string html = null)
{
if (html == null) html = _html;
var firstTag = Regex.Match(html, "<.+?>");
List eleList = new List();
List reval = new List();
GetElementsStringList(html, ref eleList);
foreach (var r in eleList)
{
HtmlInfo data = new HtmlInfo();
data.OldFullHtml = r;
data.SameLeveHtml = html;
data.TagName = Regex.Match(r, @"(?<=s{1}|<)[a-z,A-Z]+(?=>|s)", RegexOptions.IgnoreCase).Value;
data.InnerHtml = Regex.Match(r, @"(?<=>).+(?=<)", RegexOptions.Singleline).Value;
var eleBegin = Regex.Match(r, "<.+?>").Value;
var attrList = Regex.Matches(eleBegin, @"[a-z,A-Z]+="".+?""").Cast().Select(c => new { key = c.Value.Split('=').First(), value = c.Value.Split('=').Last().TrimEnd('"').TrimStart('"') }).ToList();
data.Attributes = new Dictionary();
if (attrList != null && attrList.Count > 0)
{
foreach (var a in attrList)
{
data.Attributes.Add(a.key, a.value);
}
}
reval.Add(data);
}
return reval;
}
#region private
private List GetDescendantsSource(List allList, string elementName)
{
foreach (var r in allList)
{
if (r.InnerHtml == null || !r.InnerHtml.Contains("<")) continue;
var childList = RootDescendants(r.InnerHtml).Where(c => elementName == null || c.TagName.ToLower() == elementName.ToLower()).ToList();
if (childList == null || childList.Count == 0)
{
childList = GetDescendantsSource(RootDescendants(r.InnerHtml), elementName);
if (childList != null && childList.Count > 0)
return childList;
}
else
{
return childList;
}
}
return null;
}
private void GetElementsStringList(string html, ref List eleList)
{
HtmlInfo info = new HtmlInfo();
info.TagName = Regex.Match(html, @"(?<=|s)", RegexOptions.IgnoreCase).Value;
string currentTagBeginReg = @"";//获取当前标签元素开始标签正则
string currentTagEndReg = @"";//获取当前标签元素收尾标签正则
if (string.IsNullOrEmpty(info.TagName)) return;
string eleHtml = "";
//情况1
//情况2
//情况3 错误格式
//情况4endif
if (Regex.IsMatch(html, @"().Select(c => c.Value).ToList();
var currentTagEndMatches = Regex.Matches(newHtml, currentTagEndReg).Cast().Select(c => c.Value).ToList();
if (currentTagBeginMatches.Count == currentTagEndMatches.Count)
{ //两个签标元素相等
return newHtml;
}
return GetElementString(html, currentTagBeginReg, currentTagEndReg, ++i);
}
private string GetRegNextByNum(string val, string currentTagBeginReg, string currentTagEndReg, int i)
{
return Regex.Match(val, currentTagBeginReg + @"((.*?)" + currentTagEndReg + "){" + i + "}?", RegexOptions.IgnoreCase | RegexOptions.Singleline).Value;
}
#endregion
}
public static class XHtmlElementExtendsion
{
///
/// 获取最近的相同层级的HTML元素
///
/// 等于null为所有元素
/// Descendants(this IEnumerable htmlInfoList, string elementName = null)
{
var html = htmlInfoList.First().InnerHtml;
XHtmlElement xhe = new XHtmlElement(html);
return xhe.Descendants(elementName);
}
///
/// 获取下级元素
///
///
/// ChildDescendants(this IEnumerable htmlInfoList, string elementName = null)
{
var html = htmlInfoList.First().InnerHtml;
XHtmlElement xhe = new XHtmlElement(html);
return xhe.RootDescendants(html).Where(c => elementName == null || c.TagName == elementName).ToList();
}
///
/// 获取父级
///
///
/// ParentDescendant(this IEnumerable htmlInfoList,string fullHtml)
{
var saveLeveHtml = htmlInfoList.First().SameLeveHtml;
string replaceGuid=Guid.NewGuid().ToString();
fullHtml = fullHtml.Replace(saveLeveHtml,replaceGuid);
var parentHtml = Regex.Match(fullHtml, @"<[^<]+?>[^<]*?" + replaceGuid + @".*?").Value;
parentHtml = parentHtml.Replace(replaceGuid, saveLeveHtml);
XHtmlElement xhe = new XHtmlElement(parentHtml);
return xhe.RootDescendants();
}
}
///
/// html信息类
///
public class HtmlInfo
{
///
/// 元素名
///
public string TagName { get; set; }
///
/// 元素属性
///
public Dictionary Attributes { get; set; }
///
/// 元素内部html
///
public string InnerHtml { get; set; }
public string OldFullHtml { get; set; }
public string SameLeveHtml { get; set; }
///
/// 得到元素的html
///
///
前台HTML:
我是1 icon
