How to detect DataGridView CheckBox event change?

Question

I have a winforms app and want to trigger some code when a checkbox embedded in a DataGridView control is checked / unchecked. Every event I have tried either

Answer 1

I have found a simpler answer to this problem. I simply use reverse logic. The code is in VB but it is not much different than C#.

 Private Sub DataGridView1_CellContentClick(sender As Object, e As 
 DataGridViewCellEventArgs) Handles DataGridView1.CellContentClick

    Dim _ColumnIndex As Integer = e.ColumnIndex
    Dim _RowIndex As Integer = e.RowIndex

    'Uses reverse logic for current cell because checkbox checked occures 
     'after click
    'If you know current state is False then logic dictates that a click 
     'event will set it true
    'With these 2 check boxes only one can be true while both can be off

    If DataGridView1.Rows(_RowIndex).Cells("Column2").Value = False And 
       DataGridView1.Rows(_RowIndex).Cells("Column3").Value = True Then
        DataGridView1.Rows(_RowIndex).Cells("Column3").Value = False
    End If

    If DataGridView1.Rows(_RowIndex).Cells("Column3").Value = False And 
    DataGridView1.Rows(_RowIndex).Cells("Column2").Value = True Then
        DataGridView1.Rows(_RowIndex).Cells("Column2").Value = False
    End If


End Sub

One of the best things about this is no need for multiple events.

Answer 2

I found @Killercam's solution to work but was a bit dodgy if the user double clicked too fast. Not sure if other's found that the case either. I found a another solution here.

It uses the datagrid's CellValueChanged and CellMouseUp. Changhong explains that

"The reason for that is OnCellvalueChanged event won’t fire until the DataGridView thinks you have completed editing. This makes senses for a TextBox Column, as OnCellvalueChanged wouldn’t [bother] to fire for each key strike, but it doesn’t [make sense] for a CheckBox."

Here it is in action from his example:

private void myDataGrid_OnCellValueChanged(object sender, DataGridViewCellEventArgs e)
{
    if (e.ColumnIndex == myCheckBoxColumn.Index && e.RowIndex != -1)
    {
        // Handle checkbox state change here
    }
}

And the code to tell the checkbox it is done editing when it is clicked, instead of waiting till the user leaves the field:

private void myDataGrid_OnCellMouseUp(object sender,DataGridViewCellMouseEventArgs e)
{
    // End of edition on each click on column of checkbox
    if (e.ColumnIndex == myCheckBoxColumn.Index && e.RowIndex != -1)
    {
        myDataGrid.EndEdit();
    }
}

Edit: A DoubleClick event is treated separate from a MouseUp event. If a DoubleClick event is detected, the application will ignore the first MouseUp event entirely. This logic needs to be added to the CellDoubleClick event in addition to the MouseUp event:

private void myDataGrid_OnCellDoubleClick(object sender,DataGridViewCellEventArgs e)
{
    // End of edition on each click on column of checkbox
    if (e.ColumnIndex == myCheckBoxColumn.Index && e.RowIndex != -1)
    {
        myDataGrid.EndEdit();
    }
}

Answer 3

In the event CellContentClick you can use this strategy:

private void myDataGrid_CellContentClick(object sender, DataGridViewCellEventArgs e)
{    
    if (e.ColumnIndex == 2)//set your checkbox column index instead of 2
    {   //When you check
        if (Convert.ToBoolean(myDataGrid.Rows[e.RowIndex].Cells[2].EditedFormattedValue) == true)
        {
            //EXAMPLE OF OTHER CODE
            myDataGrid.Rows[e.RowIndex].Cells[5].Value = DateTime.Now.ToShortDateString();

            //SET BY CODE THE CHECK BOX
            myDataGrid.Rows[e.RowIndex].Cells[2].Value = 1;
        }
        else //When you decheck
        {
            myDataGrid.Rows[e.RowIndex].Cells[5].Value = String.Empty;

            //SET BY CODE THE CHECK BOX
            myDataGrid.Rows[e.RowIndex].Cells[2].Value = 0;
        }
    }
}

Answer 4

To do this when using the devexpress xtragrid, it is necessary to handle the EditValueChanged event of a corresponding repository item as described here. It is also important to call the gridView1.PostEditor() method to ensure the changed value has been posted. Here is an implementation:

        private void RepositoryItemCheckEdit1_EditValueChanged(object sender, System.EventArgs e)
        {
            gridView3.PostEditor();

            var isNoneOfTheAboveChecked = false;

            for (int i = 0; i < gridView3.DataRowCount; i++)
            {
                if ((bool) (gridView3.GetRowCellValue(i, "NoneOfTheAbove")) && (bool) (gridView3.GetRowCellValue(i, "Answer")))
                {
                    isNoneOfTheAboveChecked = true;
                    break;
                }
            }

            if (isNoneOfTheAboveChecked)
            {
                for (int i = 0; i < gridView3.DataRowCount; i++)
                {
                    if (!((bool)(gridView3.GetRowCellValue(i, "NoneOfTheAbove"))))
                    {
                        gridView3.SetRowCellValue(i, "Answer", false);
                    }
                }
            }
        }

Note that because the xtragrid doesnt provide an enumerator it is necessary to use a for loop to iterate over rows.

Answer 5

Ben Voigt found the best solution in a comment-reply above:

private void dgvStandingOrder_CurrentCellDirtyStateChanged(object sender, EventArgs e)
{
    if (dgvStandingOrder.CurrentCell is DataGridViewCheckBoxCell)
        dgvStandingOrder.CommitEdit(DataGridViewDataErrorContexts.Commit);
}

Seriously, that's ALL you need.

Answer 6

It's all about editing the cell, the problem that is the cell didn't edited actually, so you need to save The changes of the cell or the row to get the event when you click the check box so you can use this function:

datagridview.CommitEdit(DataGridViewDataErrorContexts.CurrentCellChange)

with this you can use it even with a different event.