TXT转HTML

1. 
   
2. #region TXT代码转换成HTML格式
   
3.     /// <summary>
   
4.     /// TXT代码转换成HTML格式
   
5.     /// </summary>
   
6.     /// <param name="Input">等待处理的字符串</param>
   
7.     /// <returns>处理后的字符串</returns>
   
8.     public static String ToHtml(string Input)
   
9.     {
   
10.         StringBuilder sb = new StringBuilder(Input);
    
11.         sb.Replace("&", "&");
    
12.         sb.Replace("<", "<");
    
13.         sb.Replace(">", ">");
    
14.         sb.Replace("\r\n", "<br/>");
    
15.         sb.Replace("\r", "<br/>");
    
16.         sb.Replace("\n", "<br/>");
    
17.         sb.Replace("\t", " ");
    
18.         sb.Replace(" ", " ");
    
19.         return sb.ToString();
    
20.     }
    
21.     #endregion

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HTML转TXT

1.   #region HTML代码转换成TXT格式
   
2.     /// <summary>
   
3.     /// HTML代码转换成TXT格式
   
4.     /// </summary>
   
5.     /// <param name="Input">等待处理的字符串</param>
   
6.     /// <returns>处理后的字符串</returns>
   
7.     public static String ToTxt(String Input)
   
8.     {
   
9.         StringBuilder sb = new StringBuilder(Input);
   
10.         sb.Replace(" ", " ");
    
11.         sb.Replace("<br>", "\r\n");
    
12.         sb.Replace("<br>", "\n");
    
13.         sb.Replace("<br />", "\n");
    
14.         sb.Replace("<br />", "\r\n");
    
15.         sb.Replace("<", "<");
    
16.         sb.Replace(">", ">");
    
17.         sb.Replace("&", "&");
    
18.         return sb.ToString();
    
19.     }
    
20.     #endregion

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清除HTML标记：

1. 
   
2. #region 清除HTML标记
   
3.     /// <summary>
   
4.     /// 清除HTML标记
   
5.     /// </summary>
   
6.     /// <param name="Htmlstring">要清除的字符串</param>
   
7.     /// <returns></returns>
   
8.     public static string DropHTML(string Htmlstring)
   
9.     {
   
10.         //删除脚本  
    
11.         Htmlstring = Regex.Replace(Htmlstring, @"<script[^>]*?>.*?</script>", "", RegexOptions.IgnoreCase);
    
12.         //删除HTML  
    
13.         Htmlstring = Regex.Replace(Htmlstring, @"<(.[^>]*)>", "", RegexOptions.IgnoreCase);
    
14.         Htmlstring = Regex.Replace(Htmlstring, @"([\r\n])[\s]+", "", RegexOptions.IgnoreCase);
    
15.         Htmlstring = Regex.Replace(Htmlstring, @"-->", "", RegexOptions.IgnoreCase);
    
16.         Htmlstring = Regex.Replace(Htmlstring, @"<!--.*", "", RegexOptions.IgnoreCase);
    
17.         Htmlstring = Regex.Replace(Htmlstring, @"&(quot|#34);", "\"", RegexOptions.IgnoreCase);
    
18.         Htmlstring = Regex.Replace(Htmlstring, @"&(amp|#38);", "&", RegexOptions.IgnoreCase);
    
19.         Htmlstring = Regex.Replace(Htmlstring, @"&(lt|#60);", "<", RegexOptions.IgnoreCase);
    
20.         Htmlstring = Regex.Replace(Htmlstring, @"&(gt|#62);", ">", RegexOptions.IgnoreCase);
    
21.         Htmlstring = Regex.Replace(Htmlstring, @"&(nbsp|#160);", " ", RegexOptions.IgnoreCase);
    
22.         Htmlstring = Regex.Replace(Htmlstring, @"&(iexcl|#161);", "\xa1", RegexOptions.IgnoreCase);
    
23.         Htmlstring = Regex.Replace(Htmlstring, @"&(cent|#162);", "\xa2", RegexOptions.IgnoreCase);
    
24.         Htmlstring = Regex.Replace(Htmlstring, @"&(pound|#163);", "\xa3", RegexOptions.IgnoreCase);
    
25.         Htmlstring = Regex.Replace(Htmlstring, @"&(copy|#169);", "\xa9", RegexOptions.IgnoreCase);
    
26.         Htmlstring = Regex.Replace(Htmlstring, @"&#(\d+);", "", RegexOptions.IgnoreCase);
    
27.         Htmlstring.Replace("<", "");
    
28.         Htmlstring.Replace(">", "");
    
29.         Htmlstring.Replace("\r\n", "");
    
30.         Htmlstring = HttpContext.Current.Server.HtmlEncode(Htmlstring).Trim();
    
31.         return Htmlstring;
    
32.     }
    
33.     #endregion
    

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txt转成html：
"<"转成html 应该是“&lt;” 吧？