一：新建一个包含经纬度、时间转换的类optaDataConvert

public class optaDataConvert      {              /// <summary>            /// 时间转换            /// </summary>            /// <param name="value"></param>            /// <returns></returns>            public static DateTime GetDataTime(long value)          {              return new DateTime(1970, 1, 1).AddMilliseconds(value).AddHours(8);          }          /// <summary>            /// 获取经度            /// </summary>            /// <returns></returns>            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");          }          /// <summary>            /// 获取纬度            /// </summary>            /// <returns></returns>            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");          }          /// <summary>            /// 获取经纬度度分秒            /// </summary>            /// <param name="value"></param>            /// <returns></returns>            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;          }          /// <summary>            /// 经纬度转换            /// </summary>            /// <param name="str">经度</param>            /// <param name="num">保留8位值</param>            /// <returns></returns>            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();