The value of the CheckBox in the DataGridView control in Winform is always read as False, which has been resolved

        private void DGV_DetailsViewer_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            if (e.ColumnIndex.Equals(5))
            {
                DataGridViewCheckBoxCell cbx = (DataGridViewCheckBoxCell)this.DGV_DetailsViewer.Rows[e.RowIndex].Cells[e.ColumnIndex];

                MessageBox.Show(cbx.FormattedValue.ToString());
            }
        }

The value of checkBoxCell read out by the above code is always False for unknown reasons.

 

The reason is: the CellContentClick event does not modify the value of CheckBoxCell, and this event does not work.

 

The correct approach should be to use a combination of the CurrentCellDirtyStateChanged event and the CellValueChanged event to accomplish this. code show as below:

// This event is executed first, even if the content of the modified checkboxcell takes effect immediately, otherwise it will only take effect when the cell is left.     
   private  void DGV_DetailsViewer_CurrentCellDirtyStateChanged( object sender, EventArgs e)
        {
            if (DGV_DetailsViewer.IsCurrentCellDirty)
            {
                DGV_DetailsViewer.CommitEdit(DataGridViewDataErrorContexts.Commit);
            }
        }

// After the value is modified, execute this event. The function you want to implement is implemented in this event 
 private  void DGV_DetailsViewer_CellValueChanged( object sender, DataGridViewCellEventArgs e)
        {
            if (e.RowIndex >= 0 && e.RowIndex != -1 && !this.DGV_DetailsViewer.Rows[e.RowIndex].IsNewRow)
            {

                if (e.ColumnIndex.Equals(5))
                {
                    DataGridViewCheckBoxCell cbx = (DataGridViewCheckBoxCell)this.DGV_DetailsViewer.Rows[e.RowIndex].Cells[e.ColumnIndex];

                    MessageBox.Show(cbx.FormattedValue.ToString());
                }
            }
        }