How to hide checkbox in few rows of datagridview

Question

_{Sunday, February 23, 2020 7:53 AM}

i have to show data by datagridview and i each row checkbox is coming. some time it is checked and some time unchecked. but in few cases i need to hide checkbox & cell will be blank. how can i achieve it ?

https://stackoverflow.com/questions/14124033/hide-some-datagridview-checkbox-cell

thanks

All replies (1)

_{Sunday, February 23, 2020 4:46 PM ✅Answered}

Hello,

Although hiding a DataGridViewCheckBoxCell is possible does not mean it's a good idea for this degrades the user experience. A better approach is to custom paint the cell.

In the image below the top image is what you are asking for while the second as stated provides a clear understanding to the majority of users the check box cell is not available.

Note I used the following to set cells to read only so there is no concrete logic.

for (var rowIndex = 0; rowIndex < dataGridView1.Rows.Count -1; rowIndex++)
{
    if (rowIndex % 2 == 0)
    {
        dataGridView1.Rows[rowIndex].Cells[0].ReadOnly = true;
    }
}

Events to handle read-only cells in column zero.

dataGridView1.CellPainting += DataGridView1_CellPainting;
dataGridView1.CellContentClick += DataGridView1_CellContentClick;

Handling cell click

private void DataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
    if (e.ColumnIndex != 0) return;
    if (dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].ReadOnly)
    {
        return;
    }
}

In CellPainting use one of the paths laid out in the inner if statement.

private void DataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
    if (e.ColumnIndex > -1 && e.RowIndex > -1 && dataGridView1.Columns[e.ColumnIndex] is DataGridViewCheckBoxColumn && dataGridView1[e.ColumnIndex, e.RowIndex].ReadOnly)
    {
        var checkSize = CheckBoxRenderer.GetGlyphSize(e.Graphics, CheckBoxState.CheckedNormal);
        e.Handled = true;
        e.PaintBackground(e.CellBounds, true);
        if (e.Value != null)
        {
            // best
            CheckBoxRenderer.DrawCheckBox(e.Graphics, 
                new Point(e.CellBounds.X + e.CellBounds.Width / 2 - checkSize.Width / 2, e.CellBounds.Y + e.CellBounds.Height / 2 - checkSize.Height / 2),
                (bool)e.Value ? System.Windows.Forms.VisualStyles.CheckBoxState.CheckedDisabled : CheckBoxState.UncheckedDisabled);

            // works but not intuitive 
            //e.Paint(e.ClipBounds, DataGridViewPaintParts.Border | DataGridViewPaintParts.Background);  //put what to draw
            //e.Handled = true;
        }
    }
}

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