C# 判断字符串是否为整数

 /// <summary>
        /// 判断一个字符串是否是正整数
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static bool IsInteger(string s)
        {
            string pattern = @"^d*$";
            return System.Text.RegularExpressions.Regex.IsMatch(s, pattern);
        }
        /// <summary>
        /// 判断一个字符串是否为合法数字(0-32整数)
        /// </summary>
        /// <param name="s">字符串</param>
        /// <returns></returns>
        public static bool IsNumber(string s)
        {
            return IsNumber(s, 32, 0);
        }
        /// <summary>
        /// 判断一个字符串是否为合法数字(指定整数位数和小数位数)
        /// </summary>
        /// <param name="s">字符串</param>
        /// <param name="precision">整数位数</param>
        /// <param name="scale">小数位数</param>
        /// <returns></returns>
        public static bool IsNumber(string s, int precision, int scale)
        {
            if ((precision == 0) && (scale == 0))
            {
                return false;
            }
            string pattern = @"(^d{1," + precision + "}";
            if (scale > 0)
            {
                pattern += @".d{0," + scale + "}$)|" + pattern;
            }
            pattern += "$)";
            return System.Text.RegularExpressions.Regex.IsMatch(s, pattern);
        }