App_Code/StringClass.cs

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using System;
using System.Text;
using System.Text.RegularExpressions;
using System.Security.Cryptography;
using System.IO;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

/// <summary>
/// StringClass 的摘要说明
/// </summary>
public class StringClass
{
    #region 构造函数
    public StringClass()
    {

    }
    #endregion

    #region 字符串截取函数
    /// <summary>
    /// 字符串截取函数
    /// </summary>
    /// <param name="inputString">要截取的字符串</param>
    /// <param name="len">要截取的长度</param>
    /// <returns>string</returns>
    /// 
    public static string CutString(string inputString, int len)
    {
        ASCIIEncoding ascii = new ASCIIEncoding();
        int tempLen = 0;
        string tempString = "";
        byte[] s = ascii.GetBytes(inputString);
        for (int i = 0; i < s.Length; i++)
        {
            if ((int)s[i] == 63)
            {
                tempLen += 2;
            }
            else
            {
                tempLen += 1;
            }

            try
            {
                tempString += inputString.Substring(i, 1);
            }
            catch
            {
                break;
            }

            if (tempLen > len)
                break;