Jnr Jnr - 22 days ago 9
C# Question

Datagridview checkbox checked when clicking the cell

I handle my checkbox click event with the CurrentCellDirtyStateChanged. What I want to be able to do is handle the same event when I click the cell that contains the checkbox too, i.e. when I click the cell, check the checkbox and call the DirtyStateChanged. Using the following code does not help much, it does not even call the CurrentCellDirtyStateChanged. I've run out of ideas.

private void dataGridView_CellClick(object sender, DataGridViewCellEventArgs e)
{
if(dataGridView.Columns[e.ColumnIndex].ReadOnly != true)
{
//option 1
(dataGridView.CurrentRow.Cells[e.ColumnIndex] as DataGridViewCheckBoxCell).Value = true;
//option 2
DataGridViewCheckBoxCell cbc = (dataGridView.CurrentRow.Cells[e.ColumnIndex] as DataGridViewCheckBoxCell);
cbc.Value = true;
//option 3
dataGridView.CurrentCell.Value = true;
}

}

Answer

As Bioukh points out, you must call NotifyCurrentCellDirty(true) to trigger your event handler. However, adding that line will no longer update your checked state. To finalize your checked state change on click we'll add a call to RefreshEdit. This will work to toggle your cell checked state when the cell is clicked, but it will also make the first click of the actual checkbox a bit buggy. So we add the CellContentClick event handler as shown below and you should be good to go.


private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
{
  DataGridViewCheckBoxCell cell = this.dataGridView1.CurrentCell as DataGridViewCheckBoxCell;

  if (cell != null && !cell.ReadOnly)
  {
    cell.Value = cell.Value == null || !((bool)cell.Value);
    this.dataGridView1.RefreshEdit();
    this.dataGridView1.NotifyCurrentCellDirty(true);
  }
}

private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
  this.dataGridView1.RefreshEdit();
}