using System;
using System.Collections.Generic;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;

namespace Mini.Common
{
    public class HtmlHelper
    {
        public static string NoHTML(string Htmlstring)
        {
            if (Htmlstring.Length > 0)
            {
                //删除脚本
                Htmlstring = Regex.Replace(Htmlstring, @"<script[^>]*?>.*?</script>", "", RegexOptions.IgnoreCase);
                //删除HTML
                Htmlstring = Regex.Replace(Htmlstring, @"<(.[^>]*)>", "", RegexOptions.IgnoreCase);
                Htmlstring = Regex.Replace(Htmlstring, @"([\r\n])[\s]+", "", RegexOptions.IgnoreCase);
                Htmlstring = Regex.Replace(Htmlstring, @"-->", "", RegexOptions.IgnoreCase);
                Htmlstring = Regex.Replace(Htmlstring, @"<!--.*", "", RegexOptions.IgnoreCase);
                Htmlstring = Regex.Replace(Htmlstring, @"&(quot|#34);", "\"", RegexOptions.IgnoreCase);
                Htmlstring = Regex.Replace(Htmlstring, @"&(amp|#38);", "&", RegexOptions.IgnoreCase);
                Htmlstring = Regex.Replace(Htmlstring, @"&(lt|#60);", "<", RegexOptions.IgnoreCase);
                Htmlstring = Regex.Replace(Htmlstring, @"&(gt|#62);", ">", RegexOptions.IgnoreCase);
                Htmlstring = Regex.Replace(Htmlstring, @"&(nbsp|#160);", " ", RegexOptions.IgnoreCase);
                Htmlstring = Regex.Replace(Htmlstring, @"&(iexcl|#161);", "\xa1", RegexOptions.IgnoreCase);
                Htmlstring = Regex.Replace(Htmlstring, @"&(cent|#162);", "\xa2", RegexOptions.IgnoreCase);
                Htmlstring = Regex.Replace(Htmlstring, @"&(pound|#163);", "\xa3", RegexOptions.IgnoreCase);
                Htmlstring = Regex.Replace(Htmlstring, @"&(copy|#169);", "\xa9", RegexOptions.IgnoreCase);
                Htmlstring = Regex.Replace(Htmlstring, @"&#(\d+);", "", RegexOptions.IgnoreCase);
                Htmlstring = Regex.Replace(Htmlstring, @"&ldquo;", "\"", RegexOptions.IgnoreCase);//保留【 “ 】的标点符合
                Htmlstring = Regex.Replace(Htmlstring, @"&rdquo;", "\"", RegexOptions.IgnoreCase);//保留【 ” 】的标点符合
                Htmlstring.Replace("<", "");
                Htmlstring.Replace(">", "");
                Htmlstring.Replace("\r\n", "");
                Htmlstring = WebUtility.UrlEncode(Htmlstring).Trim();
            }
            return Htmlstring;
        }
        public static string ClearHtml(string Content)
        {
            Content = Zxj_ReplaceHtml("&#[^>]*;", "", Content);
            Content = Zxj_ReplaceHtml("</?marquee[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("</?object[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("</?param[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("</?embed[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("</?table[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml(" ", "", Content);
            Content = Zxj_ReplaceHtml("</?tr[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("</?th[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("</?p[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("</?a[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("</?img[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("</?tbody[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("</?li[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("</?span[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("</?div[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("</?th[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("</?td[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("</?script[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("(javascript|jscript|vbscript|vbs):", "", Content);
            Content = Zxj_ReplaceHtml("on(mouse|exit|error|click|key)", "", Content);
            Content = Zxj_ReplaceHtml("<\\?xml[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("<\\/?[a-z]+:[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("</?font[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("</?b[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("</?u[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("</?i[^>]*>", "", Content);
            Content = Zxj_ReplaceHtml("</?strong[^>]*>", "", Content);
            string clearHtml = Content;
            return clearHtml;
        }
        /// <summary>  
        /// 清除文本中的Html标签  
        /// </summary>  
        /// <param name="patrn">要替换的标签正则表达式</param>  
        /// <param name="strRep">替换为的内容</param>  
        /// <param name="content">要替换的内容</param>  
        /// <returns></returns>  
        private static string Zxj_ReplaceHtml(string patrn, string strRep, string content)
        {
            if (string.IsNullOrEmpty(content))
            {
                content = "";
            }
            Regex rgEx = new Regex(patrn, RegexOptions.IgnoreCase);
            string strTxt = rgEx.Replace(content, strRep);
            return strTxt;
        }
    }
}