/// <summary>
/// 根据学生的ID删除学生
/// </summary>
/// <param name="id">学生ID</param>
void DelStudentById(int id)
{
var model = StudentList.FirstOrDefault(s => s.Id == id);
if (model != null)
{
StudentList.Remove(model);
}
}
private async void ViewStudentEdit()
{
if (SelectedStudent == null)
{
await DialogHost.Show(new OkMessageDialog()
{
DataContext = "Please select a student!"
});
return;
}
await DialogHost.Show(new PleaseWaitView(), "RootDialog",
delegate(object sender, DialogOpenedEventArgs args)
{
Task.Run(() =>
{
//_oldRequirementStudents = Requirements;
AddRequirementsToStudent(SelectedStudent);
//Requirements = _context.RequirementStudents.AsNoTracking()
// .Where(c => c.StudentId == SelectedStudent.Id)
// .ToList();
Requirements = _context.RequirementStudents
.Where(c => c.StudentId == SelectedStudent.Id)
.ToList();
Thread.Sleep(1000);
}).ContinueWith((t, _) =>
{
//Requirements = SelectedStudent.RequirementStudents.ToList();
_oldRequirementStudents = Requirements;
SelectedYearLevel = SelectedStudent.YearLevel;
SelectedSection = SelectedStudent.Section;
YearLevels = _context.YearLevels.ToObservableCollection();
GenderList = Enum.GetNames(typeof(EnumGender)).ToList();
args.Session.UpdateContent(new StudentEditView()
{
DataContext = this
});
}, null, TaskScheduler.FromCurrentSynchronizationContext());
}, delegate(object sender, DialogClosingEventArgs args)
{
bool result = false;
if (Equals(args.Parameter, false))
{
return;
}
if (Equals(args.Parameter, "Close"))
{
try
{
_context.Entry(SelectedStudent).CurrentValues.SetValues(_context.Entry(SelectedStudent).OriginalValues);
foreach (var requirement in Requirements)
{
_context.Entry(requirement).CurrentValues.SetValues(_context.Entry(requirement).OriginalValues);
}
}
catch (Exception e)
{
Console.WriteLine(e);
}
Requirements = _oldRequirementStudents;
return;
}
if (_isOkMessageOpen && Equals(args.Parameter, "Cancel"))
{
_isOkMessageOpen = false;
args.Cancel();
args.Session.UpdateContent(_content);
}
if (Equals(args.Parameter, "Update"))
{
args.Cancel();
args.Session.UpdateContent(new PleaseWaitView());
Task.Run(() =>
{
Student student = null;
try
{
//using (var context = new MorenoContext())
//{
// foreach (var item in Requirements)
// {
// context.Entry(item).State = EntityState.Modified;
// }
// context.SaveChanges();
//}
////foreach (var requirement in Requirements)
////{
//// //_context.Entry(requirement).State = EntityState.Modified;
//// _context.RequirementStudents.Attach(requirement);
////}
////_context.SaveChanges();
SelectedStudent.YearLevel = SelectedYearLevel;
SelectedStudent.Section = SelectedSection;
student = StudentList.FirstOrDefault(c => c == SelectedStudent);
_context.SaveChanges();
result = true;
}
catch (Exception e)
{
Console.WriteLine(e.Message);
result = false;
}
return(student);
}).ContinueWith((t, _) =>
{
if (t.Result != null)
{
t.Result.RequirementStudents = Requirements;
}
LoadStudents();
var message = result ? "Update Successfull" : "Update Failed";
if (result)
{
LoadStudents();
}
args.Session.UpdateContent(new OkMessageDialog()
{
DataContext = message
});
}, null, TaskScheduler.FromCurrentSynchronizationContext());
}
if (Equals(args.Parameter, "Delete"))
{
_content = args.Session.Content;
args.Cancel();
_isOkMessageOpen = true;
args.Session.UpdateContent(new OkCancelMessageDialog()
{
DataContext = $"Are you sure you want to delete {SelectedStudent.FullName}?"
});
}
if (Equals(args.Parameter, "Ok") && _isOkMessageOpen)
{
_isOkMessageOpen = false;
args.Cancel();
args.Session.UpdateContent(new PleaseWaitView());
Task.Run(() =>
{
try
{
_context.Students.Remove(SelectedStudent);
_context.SaveChanges();
result = true;
}
catch (Exception e)
{
Console.WriteLine(e.Message);
result = false;
}
}).ContinueWith((t, _) =>
{
LoadStudents();
var message = result ? "Delete Successfull" : "Delete Failed";
_isOkMessageOpen = false;
args.Session.UpdateContent(new OkMessageDialog()
{
DataContext = message
});
}, null, TaskScheduler.FromCurrentSynchronizationContext());
}
});
//Requirements = _context.RequirementStudents.AsNoTracking().Where(c => c.StudentId == SelectedStudent.Id)
// .ToList();
//_oldRequirementStudents = Requirements;
//await AddRequirementsToStudentAsync(SelectedStudent);
//await DialogHost.Show(new StudentEditView() { DataContext = this }, "RootDialog", StudentEditClosingEventHandler);
}