private void dataGridView1_CellValueNeeded(object sender, DataGridViewCellValueEventArgs e)
{
// If this is the row for new records, no values are needed
if (e.RowIndex == dataGridView1.RowCount - 1)
{
return;
}
// Store a reference to the TestCustomer object for the row being painted
TestCustomer customer = e.RowIndex == _rowInEdit ? _customerInEdit : _customers[e.RowIndex];
// Set the cell value to paint using the TestCustomer object retrieved
switch (dataGridView1.Columns[e.ColumnIndex].Name)
{
case "personNameColumn":
e.Value = customer.Name;
break;
case "ageColumn":
e.Value = customer.Age;
break;
case "hasAJobColumn":
e.Value = customer.HasAJob;
break;
case "genderColumn":
e.Value = customer.Gender;
break;
}
}
private void dataGridView1_NewRowNeeded(object sender, DataGridViewRowEventArgs e)
{
// Create a new TestCustomer object when the user edits
// the row for new records
_customerInEdit = new TestCustomer();
_rowInEdit = dataGridView1.Rows.Count - 1;
}
private void dataGridView1_CancelRowEdit(object sender, QuestionEventArgs e)
{
if (_rowInEdit == dataGridView1.Rows.Count - 2 && _rowInEdit == _customers.Count)
{
// If the user has canceled the edit of a newly created row,
// replace the corresponding TestCustomer object with a new, empty one
_customerInEdit = new TestCustomer();
}
else
{
// If the user has canceled the edit of an existing row,
// release the corresponding TestCustomer object
_customerInEdit = null;
_rowInEdit = -1;
}
}
private void dataGridView1_UserDeletingRow(object sender, DataGridViewRowCancelEventArgs e)
{
if (e.Row.Index < _customers.Count)
{
// If the user has deleted an existing row, remove the
// corresponding TestCustomer object from the data store
_customers.RemoveAt(e.Row.Index);
}
if (e.Row.Index == _rowInEdit)
{
// If the user has deleted a newly created row, release
// the corresponding TestCustomer object
_rowInEdit = -1;
_customerInEdit = null;
}
}
private void dataGridView1_CellValuePushed(object sender, DataGridViewCellValueEventArgs e)
{
// Store a reference to the TestCustomer object for the row being edited
if (e.RowIndex < _customers.Count)
{
// If the user is editing a new row, create a new TestCustomer object
TestCustomer customer = _customers[e.RowIndex];
_customerInEdit ??= new TestCustomer(customer.Name, customer.Age, customer.HasAJob, customer.Gender);
_rowInEdit = e.RowIndex;
}
// Set the appropriate TestCustomer property to the cell value entered
object newValue = e.Value;
switch (dataGridView1.Columns[e.ColumnIndex].Name)
{
case "personNameColumn":
_customerInEdit.Name = newValue.ToString();
break;
case "ageColumn":
if (int.TryParse(newValue.ToString(), out int result))
{
_customerInEdit.Age = result;
}
break;
case "hasAJobColumn":
_customerInEdit.HasAJob = (bool)newValue;
break;
case "genderColumn":
_customerInEdit.Gender = newValue.ToString();
break;
}
}
private void dataGridView1_RowValidated(object sender, DataGridViewCellEventArgs e)
{
// Save row changes if any were made and release the edited
// TestCustomer object if there is one.
if (e.RowIndex >= _customers.Count && e.RowIndex != dataGridView1.Rows.Count - 1)
{
// Add the new TestCustomer object to the data store
_customers.Add(_customerInEdit);
_customerInEdit = null;
_rowInEdit = -1;
}
else if (_customerInEdit != null && e.RowIndex < _customers.Count)
{
// Save the modified TestCustomer object in the data store
_customers[e.RowIndex] = _customerInEdit;
_customerInEdit = null;
_rowInEdit = -1;
}
else if (dataGridView1.ContainsFocus)
{
_customerInEdit = null;
_rowInEdit = -1;
}
}