本文共 1223 字，大约阅读时间需要 4 分钟。
经度是分和秒是按60进位，如果要做运算第一步就是转换成浮点数，之后就是计算和还原。
- using System.Text.RegularExpressions;
- public static double DegreeFromString(string str)
- {
- Match match = Regex.Match(str,
- @"(?<hour>[0-9]+)°(?<minute>[0-9]+)(′|')(?<second>[0-9]+(/.[0-9]+)?)(″|""|'')");
- if (match.Success)
- {
- double hour = 0, minute = 0, second = 0;
- double.TryParse(match.Result("${hour}"), out hour);
- double.TryParse(match.Result("${minute}"), out minute);
- double.TryParse(match.Result("${second}"), out second);
- return hour + minute / 60 + second / 3600;
- }
- else return 0;
- }
- public static string DegreeToString(double degree)
- {
- double minute = (degree - (int)degree) * 60;
- double second = (minute - (int)minute) * 60;
- return string.Format("{0:#}°{1:#}′{2:#.00}″", degree, Math.Abs(minute), Math.Abs(second));
- }
- private void button1_Click(object sender, EventArgs e)
- {
- Console.WriteLine(DegreeToString(DegreeFromString("20°53'41''")));
- Console.WriteLine(DegreeToString(DegreeFromString("10°11'20.5''")));
- Console.WriteLine(DegreeToString(DegreeFromString("20°53'41''") - DegreeFromString("10°11'20.5''")));
- Console.WriteLine(DegreeToString(DegreeFromString("10°11'20.5''") - DegreeFromString("20°53'41''")));
- }
输出：
- 21°54′41.00″
- 10°11′20.50″
- 11°42′20.50″
- -11°42′20.50″
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