搜尋之路- c#從html中提取文本

 

直接封裝成一個類的，用起來還挺方便的

 

 

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text.RegularExpressions;

/// <summary>
/// HtmlExtract 抽取html裡面的文本資訊
/// </summary>
public class HtmlExtract
{
   
        #region private attributes
        private string _strHtml;
        #endregion

        #region public mehtods
         public HtmlExtract(string inStrHtml)
        { _strHtml = inStrHtml;}

        public string ExtractText()
        {
            string result = _strHtml;
            result = RemoveComment(result);
            result = RemoveScript(result);
            result = RemoveStyle(result);
            result = RemoveTags(result);
            return result.Trim();
        }
        #endregion

     #region private methods
       private string RemoveComment(string input)
{
string result = input;
//remove comment
result = Regex.Replace(result, @"<!--[^-]*-->", string.Empty, RegexOptions.IgnoreCase);
return result;
}
       private string RemoveStyle(string input)
{
string result = input;
//remove all styles
result = Regex.Replace(result, @"<style[^>]*?>.*?</style>", string.Empty, RegexOptions.IgnoreCase | RegexOptions.Singleline);
return result;
}
       private string RemoveScript(string input)
{
string result = input;
result = Regex.Replace(result, @"<script[^>]*?>.*?</script>", string.Empty, RegexOptions.IgnoreCase | RegexOptions.Singleline);
result = Regex.Replace(result, @"<noscript[^>]*?>.*?</noscript>", string.Empty, RegexOptions.IgnoreCase | RegexOptions.Singleline);
return result;
}
       private string RemoveTags(string input)
{
string result = input;
result = result.Replace(" ", " ");
result = result.Replace("'", "/"");
result = result.Replace("<", "<");
result = result.Replace(">", ">");
result = result.Replace("&", "&");
result = result.Replace("<br>", "/r/n");
result = Regex.Replace(result, @"<[/s/S]*?>", string.Empty, RegexOptions.IgnoreCase);
return result;
}
     #endregion
}