public class StrHelper{    PRivate static string passWord;//加密字符串    /// <summary>    /// 判斷輸入是否數字    /// </summary>    /// <param name="num">要判斷的字符串</param>    /// <returns></returns>    static public bool VldInt(string num)    {        #region        int ResultNum;        return int.TryParse(num, out ResultNum);        #endregion    }    /// <summary>    /// 返回文本編輯器替換后的字符串    /// </summary>    /// <param name="str">要替換的字符串</param>    /// <returns></returns>    static public string GetHtmlEditReplace(string str)    {        #region        return str.Replace("'", "’").Replace("", " ").Replace(",", "，").Replace("%", "％").            Replace("scr驗證碼圖片    /// </summary>    public void CreateCheckCodeImage()    {        #region        string checkCode = GenerateCheckCode();        if (checkCode == null || checkCode.Trim() == String.Empty)            return;        System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);        Graphics g = Graphics.FromImage(image);        try        {            //生成隨機生成器            Random random = new Random();            //清空圖片背景色            g.Clear(Color.White);            //畫圖片的背景噪音線            for (int i = 0; i < 25; i++)            {                int x1 = random.Next(image.Width);                int x2 = random.Next(image.Width);                int y1 = random.Next(image.Height);                int y2 = random.Next(image.Height);                g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);            }            var font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));            System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);            g.DrawString(checkCode, font, brush, 2, 2);            //畫圖片的前景噪音點            for (int i = 0; i < 150; i++)            {                int x = random.Next(image.Width);                int y = random.Next(image.Height);                image.SetPixel(x, y, Color.FromArgb(random.Next()));            }            //畫圖片的邊框線            g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);            var ms = new MemoryStream();            image.Save(ms, ImageFormat.Gif);            HttpContext.Current.Response.ClearContent();            HttpContext.Current.Response.ContentType = "image/Gif";            HttpContext.Current.Response.BinaryWrite(ms.ToArray());        }        finally        {            g.Dispose();            image.Dispose();        }        #endregion    }    #region 生成指定位數隨機數    private static char[] constant =           {           '0','1','2','3','4','5','6','7','8','9',           'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',           'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'           };    public static string GenerateRandom(int Length)    {        var newRandom = new StringBuilder(62);        var rd = new Random();        for (int i = 0; i < Length; i++)        {            newRandom.Append(constant[rd.Next(62)]);        }        return newRandom.ToString();    }    public static string GetNumRandom(int Length)    {        var newRandom = new StringBuilder(10);        char[] NumStr={'0','1','2','3','4','5','6','7','8','9'};        var rd = new Random();        for (int i = 0; i < Length; i++)        {            newRandom.Append(constant[rd.Next(10)]);        }        return newRandom.ToString();    }    #endregion    /// <summary>    /// 獲取漢字第一個拼音    /// </summary>    /// <param name="input"></param>    /// <returns></returns>    static public string getSpells(string input)    {        #region        int len = input.Length;        string reVal = "";        for (int i = 0; i < len; i++)        {            reVal += getSpell(input.Substring(i, 1));        }        return reVal;        #endregion    }    static public string getSpell(string cn)    {        #region        byte[] arrCN = Encoding.Default.GetBytes(cn);        if (arrCN.Length > 1)        {            int area = (short)arrCN[0];            int pos = (short)arrCN[1];            int code = (area << 8) + pos;            int[] areacode = { 45217, 45253, 45761, 46318, 46826, 47010, 47297, 47614, 48119, 48119, 49062, 49324, 49896, 50371, 50614, 50622, 50906, 51387, 51446, 52218, 52698, 52698, 52698, 52980, 53689, 54481 };            for (int i = 0; i < 26; i++)            {                int max = 55290;                if (i != 25) max = areacode[i + 1];                if (areacode[i] <= code && code < max)                {                    return Encoding.Default.GetString(new byte[] { (byte)(65 + i) });