ASP.net（C#）中如何截取字符串时去除HTml标记

2010-08-10 08:47:11 897 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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ASP.net（C#）中如何截取字符串时去除HTml标记

<a hrfe = "" >gafgafgdfgadfgadf </a>gfdagadfgadfgdafgdafgadfgdafgdafgdafgadfgdaf

截取前20个字符如果没有去掉html的标记截取的字符串就会出错

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切换为时间正序

Dylan-Wang 2010-12-26

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楼主说的出错应该是页面样式的跑偏，因为截取字符串中可能只有一半的html代码，如只有一个<div>而没有</div>,而关于html过滤这个方面，1楼的方法已经很全了，楼主完全可以引用的。

zhenshangzhengren 2010-12-25

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呵呵，牛叉。这样的方法可以呢

村长_乐 2010-08-10

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/// <summary>
/// 过滤HTML字符和 UBB代码
/// </summary>
public static string NoCode(string str)
{
if (str == null || str.Length == 0) return "";
str = Regex.Replace(str, @"\<(?<x>[^\>]*)\>", @"", RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"\[(?<x>[^\]]*)\]", @"", RegexOptions.IgnoreCase);
str = str.Replace(" ", " ");
str = str.Replace(">", ">");
str = str.Replace("<", "<");
str = str.Replace("\n", " ");
str = str.Replace("\r", "");
str = str.Replace("'", "");
return str;
}

wuyq11 2010-08-10

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过滤html Regex.Replace(str,@"<[^> ]+>","");

winner2050 2010-08-10

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#2 的代码是错误的。那个作者的博客那里号称比 1# 贴出的代码性能高，其实是没有区分大小写带来性能提高。

但是带来健壮性问题。

wilensky 2010-08-10

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 #region 移除字符串中的html标记

        /// <summary>

        /// 移除字符串中的html标记

        /// </summary>

        /// <param name="html">要过滤的字符串</param>

        /// <returns>返回的结果</returns>

        public static string RemoveHtml(string html)

        {

            string result = html;

            

            MatchCollection matches = objReg.Matches(html);

            foreach (Match match in matches)

            {

                result = result.Replace(match.Value, string.Empty);

            }

            return HttpUtility.HtmlEncode(result.Replace("\"", ""));

        }



        private static readonly Regex objReg = new Regex("<.+?>", RegexOptions.IgnoreCase | RegexOptions.Compiled | RegexOptions.CultureInvariant);

Peter200694013 2010-08-10

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[Quote=引用楼主 koudefa 的回复:]
<a hrfe = "" >gafgafgdfgadfgadf </a>gfdagadfgadfgdafgdafgadfgdafgdafgdafgadfgdaf

截取前20个字符如果没有去掉html的标记截取的字符串就会出错
[/Quote]
你说的出错是指什么？
结果不对？



            String str = @"<a hrfe = "" >gafgafgdfgadfgadf </a>gfdagadfgadfgdafgdafgadfgdafgdafgdafgadfgdaf";

            str = str.Replace("\"","\"\"");



            Console.WriteLine(str.Substring(0,20));

Peter200694013 2010-08-10

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http://www.cnblogs.com/yintian2/archive/2007/11/22/968127.html

sugercgq 2010-08-10

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先过滤html再截取



/// <summary>

        /// Html过滤

        /// </summary>

        /// <param name="pHtml"></param>

        /// <returns></returns>

        public static string ReplaceHTML(string pHtml)

        {

            return TestReplace.ReplaceHtmlTag(pHtml).Replace(" ", string.Empty).Replace("　", string.Empty);

        }



        public class TestReplace

        {

            private TestReplace() { }



            private static string sNR = "\r\n";

            private static string sXiaoYu = "<";

            private static string sDaYu = ">";

            private static IList<Regex> iList = new List<Regex>();



            private static string[] aReplace = new string[]

            {

                "","","","","","","","\"","&","<",">","","\xa1","\xa2","\xa3","\xa9",""

            };



            static TestReplace()

            {

                string[] aPattern = new string[]

                                    {

                                        @"<script.*?</script>",

                                        @"<style.*?</style>",

                                        @"<.*?>",

                                        @"<(.[^>]*)>",

                                        @"([\r\n])[\s]+",

                                        @"-->",

                                        @"<!--.*",

                                        @"&(quot|#34);",

                                        @"&(amp|#38);",

                                        @"&(lt|#60);",

                                        @"&(gt|#62);",

                                        @"&(nbsp|#160);",

                                        @"&(iexcl|#161);",

                                        @"&(cent|#162);",

                                        @"&(pound|#163);",

                                        @"&(copy|#169);",

                                        @"&#(\d+);"

                                    };



                for (int i = 0; i < aPattern.Length; i++)

                {

                    iList.Add(new Regex(aPattern[i]));

                }

            }



            /// <summary>

            /// 去除HTML标记

            /// </summary>

            /// <param name="Htmlstring">包括HTML的源码 </param>

            /// <returns>已经去除后的文字</returns>

            public static string ReplaceHtmlTag(string Htmlstring)

            {

                Htmlstring = Htmlstring.Replace(sNR, string.Empty);



                Regex r;

                for (int i = 0; i < iList.Count; i++)

                {

                    r = iList[i];

                    if (r != null)

                        Htmlstring = r.Replace(Htmlstring, aReplace[i], -1, 0);

                }



                Htmlstring = Htmlstring.Replace(sXiaoYu, string.Empty);

                Htmlstring = Htmlstring.Replace(sDaYu, string.Empty);

                Htmlstring = Htmlstring.Replace(sNR, string.Empty);

                return Htmlstring;

            }

        }

调用 ReplaceHTML('html代码').Substring(0,20);

q107770540 2010-08-10

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public string NoHTML(string Htmlstring) //去除HTML标记 

    { 

        //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.Replace(" <", ""); 

        Htmlstring.Replace(">", ""); 

        Htmlstring.Replace("\r\n", ""); 

        Htmlstring = HttpContext.Current.Server.HtmlEncode(Htmlstring).Trim(); 



        return Htmlstring; 

    }

ASP.net（C#）中如何截取字符串时去除HTml标记

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