C#: 数字经纬度和度分秒经纬度间的转换

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication1

{

    /// <summary>

    /// 公用的特殊函数

    /// </summary>

    public class SpecialFunctions

    {

        #region 构造函数

        /// <summary>

        /// 构造函数

        /// </summary>

        public SpecialFunctions()

        { }

        #endregion

        #region 方法

        /// <summary>

        /// 数字经纬度和度分秒经纬度转换 (Digital degree of latitude and longitude and vehicle to latitude and longitude conversion)

        /// </summary>

        /// <param name="digitalLati_Longi">数字经纬度</param>

        /// <return>度分秒经纬度</return>

        static public string ConvertDigitalToDegrees(string digitalLati_Longi)

        {

            double digitalDegree = Convert.ToDouble(digitalLati_Longi);

            return ConvertDigitalToDegrees(digitalDegree);

        }

        /// <summary>

        /// 数字经纬度和度分秒经纬度转换 (Digital degree of latitude and longitude and vehicle to latitude and longitude conversion)

        /// </summary>

        /// <param name="digitalDegree">数字经纬度</param>

        /// <return>度分秒经纬度</return>

        static public string ConvertDigitalToDegrees(double digitalDegree)

        {

            const double num = 60;

            int degree = (int)digitalDegree;

            double tmp = (digitalDegree - degree) * num;

            int minute = (int)tmp;

            double second = (tmp - minute) * num;

            string degrees = "" + degree + "°" + minute + "′" + second + "″";

            return degrees;

        }

        /// <summary>

        /// 度分秒经纬度(必须含有'°')和数字经纬度转换

        /// </summary>

        /// <param name="digitalDegree">度分秒经纬度</param>

        /// <return>数字经纬度</return>

        static public double ConvertDegreesToDigital(string degrees)

        {

            const double num = 60;

            double digitalDegree = 0.0;

            int d = degrees.IndexOf('°');           //度的符号对应的 Unicode 代码为：00B0[1]（六十进制），显示为°。

            if (d < 0)

            {

                return digitalDegree;

            }

            string degree = degrees.Substring(0, d);

            digitalDegree += Convert.ToDouble(degree);

            int m = degrees.IndexOf('′');           //分的符号对应的 Unicode 代码为：2032[1]（六十进制），显示为′。

            if (m < 0)

            {

                return digitalDegree;

            }

            string minute = degrees.Substring(d + 1, m - d - 1);

            digitalDegree += ((Convert.ToDouble(minute)) / num);

            int s = degrees.IndexOf('″');           //秒的符号对应的 Unicode 代码为：2033[1]（六十进制），显示为″。

            if (s < 0)

            {

                return digitalDegree;

            }

            string second = degrees.Substring(m + 1, s - m - 1);

            digitalDegree += (Convert.ToDouble(second) / (num * num));

            return digitalDegree;

        }

        /// <summary>

        /// 度分秒经纬度(必须含有'/')和数字经纬度转换

        /// </summary>

        /// <param name="digitalDegree">度分秒经纬度</param>

        /// <param name="cflag">分隔符</param>

        /// <return>数字经纬度</return>

        static public double ConvertDegreesToDigital_default(string degrees)

        {

            char ch = '/';

            return ConvertDegreesToDigital(degrees, ch);

        }

        /// <summary>

        /// 度分秒经纬度和数字经纬度转换

        /// </summary>

        /// <param name="digitalDegree">度分秒经纬度</param>

        /// <param name="cflag">分隔符</param>

        /// <return>数字经纬度</return>

        static public double ConvertDegreesToDigital(string degrees, char cflag)

        {

            const double num = 60;

            double digitalDegree = 0.0;

            int d = degrees.IndexOf(cflag);

            if (d < 0)

            {

                return digitalDegree;

            }

            string degree = degrees.Substring(0, d);

            digitalDegree += Convert.ToDouble(degree);

            int m = degrees.IndexOf(cflag, d + 1);

            if (m < 0)

            {

                return digitalDegree;

            }

            string minute = degrees.Substring(d + 1, m - d - 1);

            digitalDegree += ((Convert.ToDouble(minute)) / num);

            int s = degrees.Length;

            if (s < 0)

            {

                return digitalDegree;

            }

            string second = degrees.Substring(m + 1, s - m - 1);

            digitalDegree += (Convert.ToDouble(second) / (num * num));

            return digitalDegree;

        }

        #endregion

    }

}