public void DeleteSubj()
{
using (StudentuConteiner db = new StudentuConteiner())
{
try
{
var res = db.Orderlines;
if (Subj.SubjectId != 1 && !CheckRecordBeforDelete(Subj))
{
if (dialogService.YesNoDialog("Точно нужно удалить эту запись?") == true)
{
//changing DB
//we find all the records in which we have the desired Id and make a replacement
foreach (OrderLine order in res)
{
if (order.Subject.SubjectId == Subj.SubjectId)
{
order.Subject = db.Subjects.Find(new Subject()
{
SubjectId = 1
}.SubjectId);
}
}
db.Subjects.Remove(db.Subjects.Find(Subj.SubjectId));
db.SaveChanges();
//changing collection
AuthorSubjects.Remove(Subj);
SubjRecords.Remove(Subj);
Subj = SubjRecords[0];
SelectedSubj2 = Subj;
}
}
else
{
dialogService.ShowMessage("Нельзя удалить эту запись");
}
}
catch (ArgumentNullException ex)
{
dialogService.ShowMessage(ex.Message);
}
catch (OverflowException ex)
{
dialogService.ShowMessage(ex.Message);
}
catch (System.Data.SqlClient.SqlException ex)
{
dialogService.ShowMessage(ex.Message);
}
catch (System.Data.Entity.Core.EntityCommandExecutionException ex)
{
dialogService.ShowMessage(ex.Message);
}
catch (System.Data.Entity.Core.EntityException ex)
{
dialogService.ShowMessage(ex.Message);
}
}
}
private void DelFromAuthorSubjects()
{
AuthorSubjects.Remove(AuthorSubjects[Index]);
}