private void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
// 对第1，2列相同单元格进行合并
if ((e.ColumnIndex == 0 ||e.ColumnIndex==1)&& e.RowIndex != -1)
{
using
(
Brush gridBrush = new SolidBrush(this.dataGridView1.GridColor),
backColorBrush = new SolidBrush(e.CellStyle.BackColor)
)
{
using (Pen gridLinePen = new Pen(gridBrush))
{
// 清除单元格
e.Graphics.FillRectangle(backColorBrush, e.CellBounds);
// 画 Grid 边线（仅画单元格的底边线和右边线）
// 如果下一行和当前行的数据不同，则在当前的单元格画一条底边线
if (e.RowIndex < dataGridView1.Rows.Count - 1 &&
dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value.ToString() !=
e.Value.ToString())
e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left + 2,
e.CellBounds.Bottom - 1, e.CellBounds.Right - 1,
e.CellBounds.Bottom - 1);
//画最后一条记录的底线
if (e.RowIndex == dataGridView1.Rows.Count - 1)
e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left + 2,
e.CellBounds.Bottom - 1, e.CellBounds.Right - 1,
e.CellBounds.Bottom - 1);
// 画右边线
e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1,
e.CellBounds.Top, e.CellBounds.Right - 1,
e.CellBounds.Bottom);
//// 画左边线
//e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left + 2,
//e.CellBounds.Top, e.CellBounds.Left + 2,
//e.CellBounds.Bottom);
// 画（填写）单元格内容，相同的内容的单元格只填写第一个
if (e.Value != null)
{
if (e.RowIndex > 0 &&
dataGridView1.Rows[e.RowIndex - 1].Cells[e.ColumnIndex].Value.ToString() ==
e.Value.ToString())
{
}
else
{
e.Graphics.DrawString((String)e.Value, e.CellStyle.Font,
Brushes.Black, e.CellBounds.X + 2,
e.CellBounds.Y + 5, StringFormat.GenericDefault);
}
}
e.Handled = true;
}
}
}
}
