如何将字符串Cooridnates经度和纬度转换为double

Question

我有这个功能

    public string getCoordinates(double latitude, double longitude)
    {
        int latSeconds = (int)Math.Round(latitude * 3600);
        int latDegrees = latSeconds / 3600;
        latSeconds = Math.Abs(latSeconds % 3600);
        int latMinutes = latSeconds / 60;
        latSeconds %= 60;

        int longSeconds = (int)Math.Round(longitude * 3600);
        int longDegrees = longSeconds / 3600;
        longSeconds = Math.Abs(longSeconds % 3600);
        int longMinutes = longSeconds / 60;
        longSeconds %= 60;

        string result = string.Format("{0}° {1}' {2}\" {3}, {4}° {5}' {6}\" {7}",
             Math.Abs(latDegrees),
             latMinutes,
             latSeconds,
             latDegrees >= 0 ? "N" : "S",
             Math.Abs(longDegrees),
             longMinutes,
             longSeconds,
             latDegrees >= 0 ? "E" : "W");

        return result;
    }

它从double转换为字符串纬度和经度我需要反转，我有这种格式的字符串纬度和经度，我想将它转换为双倍的任何想法

请帮助