c# - 如何将具有水平合并单元格的行添加到 DataGridView

Question

我正在使用 WinForms。如何将具有水平合并单元格的行添加到 DataGridView？下图中的 WorkingTime和Touchdown Count单元格：

标签： c#winformsdatagridview

Answer 1

这是第一行水平合并的工作代码（用于居中单元格内容和正确的边框绘制），初始代码在 MSDN 上找到：

private void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
    //mering all cells in a first row
    if (e.RowIndex == 0)
    {
        if (e.ColumnIndex == 0)
        {
            e.PaintBackground(e.ClipBounds, true);
            Rectangle r = e.CellBounds;

            for (int i = 1; i < (sender as DataGridView).ColumnCount; i++)
                r.Width += (sender as DataGridView).GetCellDisplayRectangle(i, 0, true).Width;

            r.Width -= 1;
            r.Height -= 1;

            using (SolidBrush brBk = new SolidBrush(e.CellStyle.BackColor))
            using (SolidBrush brFr = new SolidBrush(e.CellStyle.ForeColor))
            {
                e.Graphics.FillRectangle(brBk, r);
                StringFormat sf = new StringFormat();
                sf.Alignment = StringAlignment.Center;
                sf.LineAlignment = StringAlignment.Center;
                e.Graphics.TextRenderingHint = TextRenderingHint.AntiAliasGridFit;
                e.Graphics.DrawString(e.Value.ToString(), e.CellStyle.Font, brFr, r, sf);
            }

            e.Handled = true;
       }
       else
            if (e.ColumnIndex > 0)
            {
                using (Pen p = new Pen((sender as DataGridView).GridColor))
                {
                    //bottom line of a cell 
                    e.Graphics.DrawLine(p, e.CellBounds.Left, e.CellBounds.Bottom - 1, e.CellBounds.Right, e.CellBounds.Bottom - 1);
                    //right vertical line of a last cell in a row
                    if (e.ColumnIndex == (sender as DataGridView).ColumnCount - 1)
                        e.Graphics.DrawLine(p, e.CellBounds.Right - 1, e.CellBounds.Top, e.CellBounds.Right - 1, e.CellBounds.Bottom);
                }

                e.Handled = true;
            }
     }
}


private void dataGridView1_Scroll(object sender, ScrollEventArgs e)
{
     //force redraw first row when scrolling
     for (int i = 0; i < (sender as DataGridView).ColumnCount; i++)
         (sender as DataGridView).InvalidateCell(i, 0);
}