C# 判斷字符串是否為整數

 /// <summary>
        /// 判斷一個字符串是否是正整數
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static bool IsInteger(string s)
        {
            string pattern = @"^\d*$";
            return System.Text.RegularExpressions.Regex.IsMatch(s, pattern);
        }
        /// <summary>
        /// 判斷一個字符串是否為合法數字(0-32整數)
        /// </summary>
        /// <param name="s">字符串</param>
        /// <returns></returns>
        public static bool IsNumber(string s)
        {
            return IsNumber(s, 32, 0);
        }
        /// <summary>
        /// 判斷一個字符串是否為合法數字(指定整數位數和小數位數)
        /// </summary>
        /// <param name="s">字符串</param>
        /// <param name="precision">整數位數</param>
        /// <param name="scale">小數位數</param>
        /// <returns></returns>
        public static bool IsNumber(string s, int precision, int scale)
        {
            if ((precision == 0) && (scale == 0))
            {
                return false;
            }
            string pattern = @"(^\d{1," + precision + "}";
            if (scale > 0)
            {
                pattern += @"\.\d{0," + scale + "}$)|" + pattern;
            }
            pattern += "$)";
            return System.Text.RegularExpressions.Regex.IsMatch(s, pattern);
        }