Triggering a checkbox value changed event in DataGridView

Question

I have a grid view that has a check box column, and I want to trigger a drawing event as soon as the value of the cell is toggled. I tried the ValueChaged and the CellEndEdit and BeginEdit, and chose the selection mode as CellSelect. As for the the first 2 events, the event was triggered upon the finishing of the edit mode, like moving out of the current cell, or going back and forth. It's just a weird behavior.

Is there anything that triggers the event on the grid view as soon as the cell value is changed?

Solution 1

A colleague of mine recommends trapping the CurrentCellDirtyStateChanged event. See http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.currentcelldirtystatechanged.aspx.

Solution 2

I use the CellContentClick event, which makes sure the user clicked the checkbox. It DOES fire multiple times even if the user stays in the same cell. The one issue is that the Value does not get updated, and always returns "false" for unchecked. The trick is to use the .EditedFormattedValue property of the cell instead of the Value property. The EditedFormattedValue will track with the check mark and is what one wishes the Value had in it when the CellContentClick is fired.

No need for a timer, no need for any fancy stuff, just use CellContentClick event and inspect the EditedFormattedValue to tell what state the checkbox is going into / just went into. If EditedFormattedValue = true, the checkbox is getting checked.

Solution 3

Another way is to handle the CellContentClick event (which doesn't give you the current value in the cell's Value property), call grid.CommitEdit(DataGridViewDataErrorContexts.Commit) to update the value which in turn will fire CellValueChanged where you can then get the actual (i.e. correct) DataGridViewCheckBoxColumn value.

private void grid_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
   grid.CommitEdit(DataGridViewDataErrorContexts.Commit);
}

private void grid_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
    // do something with grid.Rows[e.RowIndex].Cells[e.ColumnIndex].Value
}

Target .NET framework: 2.0

Solution 4

I had the same issue, but came up with a different solution:

If you make the column or the whole grid "Read Only" so that when the user clicks the checkbox it doesn't change value.

Fortunately, the DataGridView.CellClick event is still fired. In my case I do the following in the cellClick event:

if (jM_jobTasksDataGridView.Columns[e.ColumnIndex].CellType.Name == "DataGridViewCheckBoxCell")

But you could check the column name if you have more than one checkbox column.

I then do all the modification / saving of the dataset myself.

Solution 5

I finally implemented it this way

  private void dataGridView1_CellMouseClick(object sender, DataGridViewCellMouseEventArgs e)
    {

        if (e.ColumnIndex >= 0 && e.RowIndex >= 0)
        {
            if (dataGridView1[e.ColumnIndex, e.RowIndex].GetContentBounds(e.RowIndex).Contains(e.Location))
            {
                cellEndEditTimer.Start();
            }
        }

    }

    private void dataGridView1_CellEndEdit(object sender, DataGridViewCellEventArgs e)
    { /*place your code here*/}


    private void cellEndEditTimer_Tick(object sender, EventArgs e)
    {
        dataGridView1.EndEdit();
        cellEndEditTimer.Stop();
    }

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