纵向合并效果如下:
横向合并效果如下:
以下是设计思路:因为代码比较简单,所以这里不多加解释.只说下遗憾,运行以下的代码时,发现在整个DATAGRID的列完全能显示的时候,绘制背景色没有问题,但,当有一部分行或列被挡住时,使用滚动条来移动,却发现有些DATAGRIDCELL的背景色被绘制窜行了,或者丢失了.而你左右多移动几下滚动条绘制又没有问题了,估计这是因为DATAGRIDVIEW本身绘制的机制问题,刷新的比较慢.所以在这里也只是提到这种简单的实现方法,如果有些朋友需要更高级的控制或更高级的要求,我想简单地通过这种在DATAGRIDVIEW里写代码的方式是行不通了.建议使用第3方控件或者干脆自己来做一个GRID吧!(呵呵,当然,做一个GRID是一个不小的工程,不过总觉得一旦能用代码实现它将是一劳永逸的,有时间一定要尝试下!呵呵!)
以下是源代码:
#region"合并单元格的测试" private int? nextrow = null; private int? nextcol = null; private void dataGridView1_CellFormatting(object sender, System.Windows.Forms.DataGridViewCellFormattingEventArgs e) { if (this.dataGridView1.Columns["description"].Index == e.ColumnIndex && e.RowIndex >= 0) { if (this.nextcol != null & e.ColumnIndex == this.nextcol) { e.CellStyle.BackColor = Color.LightBlue; this.nextcol = null; } if (this.nextrow != null & e.RowIndex == nextrow) { e.CellStyle.BackColor = Color.LightPink; this.nextrow = null; } if (e.RowIndex != this.dataGridView1.RowCount - 1) { if (e.Value.ToString() == this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value.ToString()) { e.CellStyle.BackColor = Color.LightPink; nextrow = e.RowIndex + 1; } } } if (this.dataGridView1.Columns["name"].Index == e.ColumnIndex && e.RowIndex >= 0) { if (e.Value.ToString() == this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].Value.ToString()) { e.CellStyle.BackColor = Color.LightBlue; nextcol = e.ColumnIndex + 1; } } } //========================== //绘制单元格 private void dataGridView1_CellPainting(object sender, System.Windows.Forms.DataGridViewCellPaintingEventArgs e) { //纵向合并 if (this.dataGridView1.Columns["description"].Index == e.ColumnIndex && e.RowIndex >= 0) { using ( Brush gridBrush = new SolidBrush(this.dataGridView1.GridColor), backColorBrush = new SolidBrush(e.CellStyle.BackColor)) { using (Pen gridLinePen = new Pen(gridBrush)) { // 擦除原单元格背景 e.Graphics.FillRectangle(backColorBrush, e.CellBounds); ////绘制线条,这些线条是单元格相互间隔的区分线条, ////因为我们只对列name做处理,所以datagridview自己会处理左侧和上边缘的线条 if (e.RowIndex != this.dataGridView1.RowCount - 1) { if (e.Value.ToString() != this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value.ToString()) { e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1, e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);//下边缘的线 //绘制值 if (e.Value != null) { e.Graphics.DrawString((String)e.Value, e.CellStyle.Font, Brushes.Crimson, e.CellBounds.X + 2, e.CellBounds.Y + 2, StringFormat.GenericDefault); } } } else { e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1, e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);//下边缘的线 //绘制值 if (e.Value != null) { e.Graphics.DrawString((String)e.Value, e.CellStyle.Font, Brushes.Crimson, e.CellBounds.X + 2, e.CellBounds.Y + 2, StringFormat.GenericDefault); } } //右侧的线 e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1, e.CellBounds.Top, e.CellBounds.Right - 1, e.CellBounds.Bottom - 1); e.Handled = true; } } } //横向合并 if (this.dataGridView1.Columns["name"].Index == e.ColumnIndex && e.RowIndex >= 0) { using ( Brush gridBrush = new SolidBrush(this.dataGridView1.GridColor), backColorBrush = new SolidBrush(e.CellStyle.BackColor)) { using (Pen gridLinePen = new Pen(gridBrush)) { // 擦除原单元格背景 e.Graphics.FillRectangle(backColorBrush, e.CellBounds); if (e.Value.ToString() != this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].Value.ToString()) { //右侧的线 e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1, e.CellBounds.Top, e.CellBounds.Right - 1, e.CellBounds.Bottom - 1); //绘制值 if (e.Value != null) { e.Graphics.DrawString((String)e.Value, e.CellStyle.Font, Brushes.Crimson, e.CellBounds.X + 2, e.CellBounds.Y + 2, StringFormat.GenericDefault); } } //下边缘的线 e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1, e.CellBounds.Right - 1, e.CellBounds.Bottom - 1); e.Handled = true; } } } } #endregion