DataGridView合并单元格（多行多列合并）
一、点击在拖入的显示控件（TreeList）右上方的箭头，在Treelist任务中选择数据源，添加项目数据源，依次选择数据库、数据集，新建连接，浏览选择数据库（*.mdb），依次点击 下一步，选择“表”，完成。
二、具体代码如下：
#region"合并单元格(多行多列)"
//需要(行、列)合并的所有列标题名
List<String> colsHeaderText_V = new List<String>();
List<String> colsHeaderText_H = new List<String>();
private void InitFormatColumns()
{
colsHeaderText_V.Add("PHONE1");
colsHeaderText_V.Add("PHONE2");
colsHeaderText_H.Add("IMAGEINDEX");
colsHeaderText_H.Add("PARENTID");
colsHeaderText_H.Add("DEPARTMENT");
colsHeaderText_H.Add("LOCATION");
}
//绘制单元格
private void dataGridView1_CellPainting(object sender, System.Windows.Forms.DataGridViewCellPaintingEventArgs e)
{
foreach (string fieldHeaderText in colsHeaderText_H)
{
//纵向合并
if (e.ColumnIndex >= 0 && this.dataGridView1.Columns[e.ColumnIndex].HeaderText == fieldHeaderText && 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);
/****** 绘制单元格相互间隔的区分线条，datagridview自己会处理左侧和上边缘的线条，因此只需绘制下边框和和右边框
DataGridView控件绘制单元格时，不绘制左边框和上边框，共用左单元格的右边框，上一单元格的下边框*****/
//不是最后一行且单元格的值不为null
if (e.RowIndex < this.dataGridView1.RowCount - 1 && this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value != null)
{
//若与下一单元格值不同
if (e.Value.ToString() != this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value.ToString())
{
//下边缘的线
e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1,
e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);
//绘制值
if (e.Value != null)
{
e.Graphics.DrawString(e.Value.ToString(), e.CellStyle.Font,
Brushes.Crimson, e.CellBounds.X + 2,
e.CellBounds.Y + 2, StringFormat.GenericDefault);
}
}
//若与下一单元格值相同
else
{
//背景颜色
//e.CellStyle.BackColor = Color.LightPink; //仅在CellFormatting方法中可用
this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Style.BackColor = Color.LightBlue;
this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Style.BackColor = Color.LightBlue;
//只读（以免双击单元格时显示值）
this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].ReadOnly = true;
this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].ReadOnly = true;
}
}
//最后一行或单元格的值为null
else
{
//下边缘的线
e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1,
e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);
//绘制值
if (e.Value != null)
{
e.Graphics.DrawString(e.Value.ToString(), e.CellStyle.Font,
Brushes.Crimson, e.CellBounds.X + 2,
e.CellBounds.Y + 2, StringFormat.GenericDefault);
}
}
////左侧的线（）
//e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left,
// e.CellBounds.Top, e.CellBounds.Left,
// e.CellBounds.Bottom - 1);
//右侧的线
e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1,
e.CellBounds.Top, e.CellBounds.Right - 1,
e.CellBounds.Bottom - 1);
//设置处理事件完成（关键点），只有设置为ture,才能显示出想要的结果。
e.Handled = true;
}
}
}
}
foreach (string fieldHeaderText in colsHeaderText_V)
{
//横向合并
if (e.ColumnIndex >= 0 && this.dataGridView1.Columns[e.ColumnIndex].HeaderText == fieldHeaderText && 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);
/****** 绘制单元格相互间隔的区分线条，datagridview自己会处理左侧和上边缘的线条，因此只需绘制下边框和和右边框
DataGridView控件绘制单元格时，不绘制左边框和上边框，共用左单元格的右边框，上一单元格的下边框*****/
//不是最后一列且单元格的值不为null
if (e.ColumnIndex < this.dataGridView1.ColumnCount - 1 && this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].Value != null)
{
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(e.Value.ToString(), e.CellStyle.Font,
Brushes.Crimson, e.CellBounds.X + 2,
e.CellBounds.Y + 2, StringFormat.GenericDefault);
}
}
//若与下一单元格值相同
else
{
//背景颜色
//e.CellStyle.BackColor = Color.LightPink; //仅在CellFormatting方法中可用
this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Style.BackColor = Color.LightPink;
this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].Style.BackColor = Color.LightPink;
//只读（以免双击单元格时显示值）
this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].ReadOnly = true;
this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].ReadOnly = true;
}
}
else
{
//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(e.Value.ToString(), 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
额外：
//添加序列号 private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e) { SolidBrush b = new SolidBrush(this.dataGridView1.RowHeadersDefaultCellStyle.ForeColor); e.Graphics.DrawString((e.RowIndex + 1).ToString(System.Globalization.CultureInfo.CurrentUICulture), this.dataGridView1.DefaultCellStyle.Font,b,e.RowBounds.Location.X + 20,e.RowBounds.Location.Y + 4); }
