C#: 数字经纬度和度分秒经纬度间的转换

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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     } }