Windows Forms DataGridView 中合并单元格

Windows Forms DataGridView 没有提供合并单元格的功能，要实现合并单元格的功能就要在CellPainting事件中使用Graphics.DrawLine和 Graphics.DrawString 自己来“画”。

下面的代码可以对DataGridView第1列内容相同的单元格进行合并：

private  void dataGridView1_CellPainting( object  sender, DataGridViewCellPaintingEventArgs e)
        {
             //  对第1列相同单元格进行合并
             if  (e.ColumnIndex  ==   0   &&  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,
                            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（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 ;
                    }
                }
            }
        }

 
原文地址： http://hi.baidu.com/anymis/blog/item/e7ebc9544b871c58d00906f6.html