如何仅绘制 DataGridView 的单元格背景而不绘制其内容？

Question

我只需要绘制 DataGridView 单元格的背景而不是其内容。但是当我在绘制时，它也会绘制其内容。请帮助我。

我的代码是这样的。

private void Daywisegrid_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
        {
            if (e.RowIndex == 0 )

            {
                using (Brush gridBrush = new SolidBrush(this.Daywisegrid.GridColor))
                {
                    using (Brush backColorBrush = new SolidBrush(e.CellStyle.BackColor))
                    {
                        using (Pen gridLinePen = new Pen(gridBrush))
                        {
                            // Clear cell 
                            e.Graphics.FillRectangle(backColorBrush, e.CellBounds);
                            //Bottom line drawing
                            e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom-1 , e.CellBounds.Right, e.CellBounds.Bottom-1);


                            e.Handled = true;
                        }
                    }
                }
            }

Answer 1

我不知道为什么你需要捕捉 CellPainting 事件来改变单元格背景颜色就这样做

Daywisegrid.Rows[RowIndex].Cells[columnIndex].Style.BackColor = Color.Red;

但是如果你想在绘画中这样做尝试这个

private void Daywisegrid_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
        {
            if (e.RowIndex == 0 )

            {
                using (Brush gridBrush = new SolidBrush(this.Daywisegrid.GridColor))
                {
                    using (Brush backColorBrush = new SolidBrush(e.CellStyle.BackColor))
                    {
                        using (Pen gridLinePen = new Pen(gridBrush))
                        {
                            // Clear cell 
                            e.Graphics.FillRectangle(backColorBrush, e.CellBounds);
                            //Bottom line drawing
                            e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom-1 , e.CellBounds.Right, e.CellBounds.Bottom-1);

                              // here you force paint of content
                             e.PaintContent( e.ClipBounds  );
                            e.Handled = true;
                        }
                    }
                }
            }

Answer 2

应该是

e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom-1 , e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);

e.CellBounds.Right，e.CellBounds.Bottom - 1 点将被下一个单元格擦除。