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asp.net 截取带有html标签的字符串(先过滤html,再截取)的方法

2012-02-02 21:55 906 查看
/// <summary>
/// 根据汉字长度截取字符串
/// </summary>
/// <param name="value"></param>
/// <param name="length">中文字符串长度</param>
/// <returns></returns>
public static string CutString(this string value, int length)
{
if (string.IsNullOrEmpty(value)) return "";

int dataLength = length * 2;  //要截取的字节长度
byte[] bLength = Encoding.GetEncoding("gb2312").GetBytes(value);  //原字符串的字节长度

if (bLength.Length <= dataLength)
return value;

string strEndRes = "";
while (true)
{
strEndRes += value.Substring(strEndRes.Length, length);

int size = dataLength - Encoding.GetEncoding("gb2312").GetBytes(strEndRes).Length;
if (size <= 1)
{
if (size == 1 && Encoding.GetEncoding("gb2312").GetBytes(value.Substring(strEndRes.Length, 1)).Length == 1)
{
strEndRes += value.Substring(strEndRes.Length, 1);
}
return strEndRes;
}
length = size / 2;
}
}

#region 回车,空格过滤
/**/
/// <summary>
/// 去除HTML标记
/// </summary>
/// <param name="NoHTML">包括HTML的源码 </param>
/// <returns>已经去除后的文字</returns>
public static string NoHTML(string Htmlstring)
{
//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;
}
#endregion


asp.net 截取带有html标签的字符串(先过滤html,再截取)的方法用到这个的一般是显示文章内容的摘要的时候.

一般文章内容里有html的时候,用一般的截取,会将内容里的html一起给截出来,轻则显示出不必要的乱码,重则导致网站样式/布局的破坏.

要解决这个问题很容易,两步就可以搞定

一,过滤掉内容里的html.

二,截取过滤后的内容.

这里把c#的代码放出来.
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