VideoHome.Common/StrOperate.cs

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using System;
using System.Collections.Generic;

using System.Text;
using System.Text.RegularExpressions;
using System.Web;

namespace Common
{
    /// <summary>
    /// 字符串操作类
    /// </summary>
    public static class StrOperate
    {


   
   



        ///   <summary> 
        ///   按字节截断字符串。 
        ///   </summary> 
        public static string GetSubString(string mText, int byteCount)
        {
            if (byteCount < 1) return mText;

            if (System.Text.Encoding.Default.GetByteCount(mText) <= byteCount)
            {
                return mText;
            }
            else
            {
                byte[] txtBytes = System.Text.Encoding.Default.GetBytes(mText);
                byte[] newBytes = new byte[byteCount - 6];

                for (int i = 0; i < byteCount - 6; i++)
                    newBytes[i] = txtBytes[i];

                string str = System.Text.Encoding.Default.GetString(newBytes);
                if (str.Substring(str.Length - 1, 1) == "?")
                    str = str.Substring(0, str.Length - 1);
                return str + "..."; //Replace("?","")替换字节不对应产生的问号
            }
        }

        /// <summary>
        /// 删除html标签
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string DealHtml(string str)
        {
            str = Regex.Replace(str, @"\<(img)[^>]*>|<\/(img)>", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, @"\<(table|tbody|tr|td|th|)[^>]*>|<\/(table|tbody|tr|td|th|)>", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, @"\<(div|blockquote|fieldset|legend)[^>]*>|<\/(div|blockquote|fieldset|legend)>", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, @"\<(font|i|u|h[1-9]|s)[^>]*>|<\/(font|i|u|h[1-9]|s)>", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, @"\<(style|strong)[^>]*>|<\/(style|strong)>", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, @"\<a[^>]*>|<\/a>", "", RegexOptions.IgnoreCase);