字符串判断公共方法

/**//// <summary>
        /// 是否是数字型
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        public static bool IsNumeric(string value)
        ...{
            return Regex.IsMatch(value, @"^[+-]?d*[.]?d*$");
        }

        /**//// <summary>
        /// 是否是整数
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        public static bool IsInt(string value)
        ...{
            return Regex.IsMatch(value, @"^[+-]?d*$");
        }

        /**//// <summary>
        /// 是否是无符号数字
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        public static bool IsUnsign(string value)
        ...{
            return Regex.IsMatch(value, @"^d*[.]?d*$");
        }
        /**//// <summary>
        /// 是否是日期型
        /// 支持的格式包括("1980-06-06"和"1980/06/06")
        /// </summary>
        /// <param name="dateStr"></param>
        /// <returns></returns>
        public static bool  IsDate(string dateStr)
        ...{

            string datePat =@"^(d{4})(/|-)(d{1,2})(/|-)(d{1,2})$";
            bool IsMatch=Regex.IsMatch(dateStr,datePat);
            //日期格式不正确，正确格式：1980-06-06
            if(!IsMatch)
                return false;
            string[] dates=dateStr.Split('/','-');           
            if(dates==null || dates.Length<3)
                return false;

            int year =int.Parse(dates[0]);
            int month =int.Parse(dates[1]);
            int day =int.Parse(dates[2]);

            if (month < 1 || month > 12)
            ...{
                //"月份必须是1月-12月之间";
                return false;
            }

            if (day < 1 || day > 31)
            ...{
                //"日必须是1-31日之间";
                return false;
            }

            if ((month==4 || month==6 || month==9 || month==11) && day==31)
            ...{
                //month doesn't have 31 days!"
                    return false;
            }

            if (month == 2)
            ...{ // check for february 29th
                bool isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
                if (day > 29 || (day==29 && !isleap))
                ...{
                    // year + " 年 2 月没有 " + day + " 日"
                    return false;
                }
            }
            return true; // date is valid
        }
        #endregion