private void SignUp()
{
if (DangNhapViewModel.User == null)
{
DangNhapWindow dangNhapWindow = new DangNhapWindow();
dangNhapWindow.Show();
this.Window.Close();
}
else
{
if (this.HoiNghi.SOLUONG >= this.SucChua)
{
MessageBox.Show("Số lượng tham gia hội nghị đã đạt giới hạn.");
return;
}
try
{
using (DBQuanLiHoiNghiEntities db = new DBQuanLiHoiNghiEntities())
{
DANGKITHAMGIA dktg = (from dk in db.DANGKITHAMGIAs
where dk.IDUSER == DangNhapViewModel.User.IDUSER && dk.IDHN == this.HoiNghi.IDHN
select dk).FirstOrDefault();
if (dktg != null && dktg.TRANGTHAI == 1)
{
MessageBox.Show("Bạn đã bị chặn.");
return;
}
DANGKITHAMGIA dangky = new DANGKITHAMGIA();
dangky.IDHN = this.HoiNghi.IDHN;
dangky.IDUSER = DangNhapViewModel.User.IDUSER;
dangky.TRANGTHAI = 0;
dangky.THOIGIANDK = DateTime.Now;
db.DANGKITHAMGIAs.Add(dangky);
db.SaveChanges();
}
Status = 1;
SignUpCommand = new RelayCommand(UnSignUp);
}
catch
{
MessageBox.Show("Đã có lỗi xảy ra.");
}
}
}
private void UnSignUp()
{
if (DangNhapViewModel.User == null)
{
DangNhapWindow dangNhapWindow = new DangNhapWindow();
dangNhapWindow.Show();
this.Window.Close();
}
else
{
try
{
using (DBQuanLiHoiNghiEntities db = new DBQuanLiHoiNghiEntities())
{
var dky = from dk in db.DANGKITHAMGIAs
where dk.IDHN == this.HoiNghi.IDHN && dk.IDUSER == DangNhapViewModel.User.IDUSER
select dk;
if (dky.Count() > 0)
{
if (dky.First().TRANGTHAI == 2)
{
HOINGHI hn = db.HOINGHIs.Where(o => o.IDHN == this.HoiNghi.IDHN).FirstOrDefault();
hn.SOLUONG -= 1;
}
db.DANGKITHAMGIAs.Remove(dky.First());
db.SaveChanges();
Status = 0;
SignUpCommand = new RelayCommand(SignUp);
}
}
}
catch
{
MessageBox.Show("Đã có lỗi xảy ra.");
}
}
}