source/Repid.Utility/Helper/StringHelper.cs

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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;

namespace Repid.Utility.Helper
{
    /// <summary>
    /// 字符串处理
    /// </summary>
    public static class StringHelper
    {
        private static DateTime BaseTime = new DateTime(1970, 1, 1); //Unix起始时间

        /// <summary>
        /// 时间转时间戳
        /// </summary>
        /// <param name="time"></param>
        /// <returns></returns>
        public static long GetLongByDateTime(DateTime time)
        {
            return (time.Ticks - BaseTime.Ticks) / 10000000 - 8 * 60 * 60;
        }

        /// <summary>
        /// 时间戳转时间
        /// </summary>
        /// <param name="time"></param>
        /// <returns></returns>
        public static DateTime GetDateTimeByLong(long time)
        {
            return BaseTime.AddTicks((time + 8 * 60 * 60) * 10000000);
        }

        /// <summary>
        /// 裁剪指定长度文本(兼容中文)
        /// </summary>
        /// <param name="value">原文本</param>
        /// <param name="length">指定长度</param>
        /// <returns>裁剪后文本</returns>
        public static string Cut(this string value, int length)
        {
            if (string.IsNullOrEmpty(value)) { return string.Empty; }

            Regex regex = new Regex("[\u4e00-\u9fa5]+", RegexOptions.Compiled);

            StringBuilder sb = new StringBuilder();
            char[] stringChar = value.ToCharArray();

            int nLength = 0; bool isCut = false;

            for (int i = 0; i < stringChar.Length; i++)
            {
                if (regex.IsMatch((stringChar[i]).ToString()))
                {
                    sb.Append(stringChar[i]); nLength += 2;
                }