一：新建一个包含经纬度、时间转换的类optaDataConvert

public class optaDataConvert    {        /// 
          /// 时间转换          /// 
          ///           /// 
               public static DateTime GetDataTime(long value)        {            return new DateTime(1970, 1, 1).AddMilliseconds(value).AddHours(8);        }        /// 
          /// 获取经度          /// 
          /// 
               public static string GetLongitudeValue(decimal value)        {            ArrayList arrList = LgetValid(value);            if (arrList == null)                return string.Empty;            if (arrList.Count != 3)                return string.Empty;            return string.Format("{0}°{1}.{2}' {3}", arrList[0], arrList[1], arrList[2], value > 0 ? "E" : "W");        }        /// 
          /// 获取纬度          /// 
          /// 
               public static string GetLatitudeValue(decimal value)        {            ArrayList arrList = LgetValid(value);            if (arrList == null)                return string.Empty;            if (arrList.Count != 3)                return string.Empty;            return string.Format("{0}°{1}.{2}' {3}", arrList[0], arrList[1], arrList[2], value > 0 ? "N" : "S");        }        /// 
          /// 获取经纬度度分秒          /// 
          ///           /// 
               public  static ArrayList LgetValid(decimal value)        {            ArrayList aList = new ArrayList();            string excute = ChangeValue(value);            string[] sArray = excute.Split('|');            aList.Insert(0, sArray[0]);            aList.Insert(1, sArray[1]);            aList.Insert(2, sArray[2]);            return aList;        }        /// 
          /// 经纬度转换          /// 
          /// 经度          /// 保留8位值          /// 
               protected static string ChangeValue(decimal degree)        {            if (degree < 0)            {                degree = -degree;            }            decimal minute = (degree - (int)degree) * 60;            decimal second = (minute - (int)minute) * 60;            return ((int)degree).ToString() + "|" + ((int)minute).ToString() + "|" + ((int)second).ToString();        }        public static decimal TimeToValue(string Degrees, string Minutes, string Seconds)        {            decimal Value = decimal.Parse(Minutes) + decimal.Parse(Minutes) / 60 + decimal.Parse(Seconds) / 3600;            return Value;        }    }}

二：调用该函数

1.把时分秒转换成经纬度存储

m_cardpoint.X = optaDataConvert.TimeToValue(X_Du.Text, X_Fen.Text, X_Miao.Text); m_cardpoint.Y = optaDataConvert.TimeToValue(Y_Du.Text, Y_Fen.Text, Y_Miao.Text);（其中m_cardpoint.X 、m_cardpoint.Y 为存储经纬度的值）

2.把经纬度转换成时分秒展示在前台

ArrayList arrlistLatitude = optaDataConvert.LgetValid(m_cardpoint.Y);           Y_Du.Text = arrlistLatitude[0].ToString();           Y_Fen.Text = arrlistLatitude[1].ToString();           Y_Miao.Text = arrlistLatitude[2].ToString();