// 根据班级id，讨论课id，学生id，经度，纬度进行签到 在方法中通过班级id，讨论课id获取当堂课发起签到的位置
public void InsertAttendanceById(long classId, long seminarId, long userId, double longitude, double latitude)
{
if (seminarId.GetType().ToString() != "System.Int64" || classId.GetType().ToString() != "System.Int64" ||
userId.GetType().ToString() != "System.Int64")
{
throw new ArgumentException();//id格式错误
}
Location location = _userDao.FindTeacherLocation(classId, seminarId);
double tLongtitude = (double)location.Longitude;
double tLatitude = (double)location.Latitude;
double EARTH_RADIUS = 6378.137;//地球半径
double radLat1 = rad(tLatitude);
double radLat2 = rad(latitude);
double a = radLat1 - radLat2;
double b = rad(tLongtitude) - rad(longitude);
double s = 2 * Math.Asin(Math.Sqrt(Math.Pow(Math.Sin(a / 2), 2) +
Math.Cos(radLat1) * Math.Cos(radLat2) * Math.Pow(Math.Sin(b / 2), 2)));
s = s * EARTH_RADIUS;
s = Math.Round(s * 10000) / 10000;//s为经纬度换算出的实际距离（单位km）
Attendance attendance = new Attendance();
attendance.ClassInfo.Id = classId;
attendance.Seminar.Id = seminarId;
if (s < 0.1 && location.Status == 1)
{
attendance.AttendanceStatus = AttendanceStatus.Present;
}
else if (s < 0.1 && location.Status == 0)
{
attendance.AttendanceStatus = AttendanceStatus.Late;
}
_userDao.AddAttendance(attendance);
}
// 根据班级id，讨论课id，学生id，经度，纬度进行签到 在方法中通过班级id，讨论课id获取当堂课发起签到的位置
public void InsertAttendanceById(long classId, long seminarId, long userId, double longitude, double latitude)
{
if (seminarId.GetType().ToString() != "System.Int64" || classId.GetType().ToString() != "System.Int64" ||
userId.GetType().ToString() != "System.Int64")
{
throw new ArgumentException();//id格式错误
}
Location location = _userDao.FindTeacherLocation(classId, seminarId);
double tLongtitude = (double)location.Longitude;
double tLatitude = (double)location.Latitude;
if ((int)tLongtitude == (int)longitude && (int)tLatitude == (int)latitude)
{
Attendance attendance = new Attendance();
if (location.Status == 0)
{
attendance.AttendanceStatus = Shared.Models.AttendanceStatus.Late;
}
else
{
attendance.AttendanceStatus = Shared.Models.AttendanceStatus.Present;
}
attendance.Seminar = _userDao.GetSeminar(seminarId);
attendance.ClassInfo = _userDao.GetClass(classId);
attendance.Student = _userDao.Find(userId);
_userDao.AddAttendance(attendance);
}
}