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
}
}