private bool Add_Student(Student std, string pass = "")
{
try
{
string password = "******";
if (pass.Length > 0)
{
password = pass;
}
if (!SettingDatabase.Add_New_Student(std, password))
{
MessageBox.Show("Some Error accure to create new user for this student");
return(false);
}
DbContextDal dal = new DbContextDal();
//User UserStudent = dal.users.Find(std.ID);
User UserStudent = dal.users.Find(std.ID);
if (UserStudent != null)
{
std.user = UserStudent;
dal.students.Add(std);
dal.SaveChanges();
MessageBox.Show("The Student " + std.ID + " Added!");
return(true);
}
else
{
MessageBox.Show("Error to add student, because the user of this student deosnt created!");
}
}
catch (DbEntityValidationException ex)
{
//MessageBox.Show("Db Entity Validation Exception");
string str = "" + ex.Source + " : " + ex.GetType() + "\n-----------------------------------------------------------------------------------------------------\n" +
"Message: " + ex.Message + "\n\nExplain & solution:\nThe problem is that you try to insert an object with data that does not fit the limitations of the data base to these object fields.\n\nThe following is a list of the incorrect features:\n";
foreach (var entityValidationErrors in ex.EntityValidationErrors)
{
foreach (var validationError in entityValidationErrors.ValidationErrors)
{
str += ("Property: " + validationError.PropertyName + " Error: " + validationError.ErrorMessage + "\n");
}
}
MessageBox.Show(str);
}
catch (DbUnexpectedValidationException ex)
{
//MessageBox.Show("Db Unexpected Validation Exception");
string str = "" + ex.Source + " : " + ex.GetType() + "\n-----------------------------------------------------------------------------------------------------\n" +
"Message: " + ex.Message;
MessageBox.Show(str);
}
catch (DbUpdateException ex)
{
//MessageBox.Show("Db Update Exception");
string str = "" + ex.Source + " : " + ex.GetType() + "\n-----------------------------------------------------------------------------------------------------\n" +
"Message: " + ex.Message + "\n\nExplain & solution:\nThe problem is that you are trying to insert an object that already exists in the system with the same key, or perform object updates with invalid variables in a database. You must enter differentiated data.";
MessageBox.Show(str);
}
catch (InvalidOperationException ex)
{
//MessageBox.Show("Invalid Operation Exception");
string str = "" + ex.Source + " : " + ex.GetType() + "\n-----------------------------------------------------------------------------------------------------\n" +
"Message: " + ex.Message + "\n\nExplain & solution:\nThe problem is that the database is formatted differently from what is currently in your class code. You must do 'add-migration update_i' to changes made during code writing in the class code, and then perform a 'update-database' in your PM.";
MessageBox.Show(str);
}
catch (Exception ex)
{
//MessageBox.Show("Exception");
string str = "" + ex.Source + " : " + ex.GetType() + "\n-----------------------------------------------------------------------------------------------------\n" +
"Message: " + ex.Message;
MessageBox.Show(str);
}
return(false);
}
public bool addNewStudent(Student s, string password, string email)
{
return(SettingDatabase.Add_New_Student(s, password, email));
}
