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/// <summary>/// 判斷是否是數字/// </summary>/// <param name="str">字符串</param>/// <returns></returns>private bool IsNumeric(string str){if (str == null || str.Length == 0)return false;System.Text.ASCIIEncoding ascii = new System.Text.ASCIIEncoding();byte[] bytestr = ascii.GetBytes(str);foreach (byte c in bytestr){if (c < 48 || c > 57){return false;}}return true;}