c#判斷字符串是否爲數字或日期

c#判斷字符是否爲日期 :

        /// <summary>
        /// 判斷字符是否爲日期
        /// </summary>
        /// <param name="value">傳入的值</param>
        /// <returns>bool類型</returns>
        public bool IsDate(string value)
        {
            return Regex.IsMatch(value, @"^((((1[6-9]|[2-9]\d)\d{2})-(0?[13578]|1[02])-(0?[1-9]|[12]\d|3[01]))|(((1[6-9]|[2-9]\d)\d{2})-(0?[13456789]|1[012])-(0?[1-9]|[12]\d|30))|(((1[6-9]|[2-9]\d)\d{2})-0?2-(0?[1-9]|1\d|2[0-9]))|(((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))-0?2-29-))$");
        }

 

c#判斷字符是否爲數字 (包含小數):

        /// <summary>
        /// 判斷字符是否爲數值
        /// </summary>
        /// <param name="value">傳入的值</param>
        /// <returns></returns>
        public bool IsNumeric(string inString)
        {
            inString = inString.Trim();
            bool haveNumber = false;
            bool haveDot = false;
            for (int i = 0; i < inString.Length; i++)
            {
                if (Char.IsNumber(inString[i]))
                {
                    haveNumber = true;
                }
                else if (inString[i] == '.')
                {
                    if (haveDot)
                    {
                        return false;
                    }
                    else
                    {
                        haveDot = true;
                    }
                }
                else if (i == 0)
                {
                    if (inString[i] != '+' && inString[i] != '-')
                    {
                        return false;
                    }
                }
                else
                {
                    return false;
                }
                if (i > 20)
                {
                    return false;
                }
            }
            return haveNumber;

        }