DataGridView合并单元格

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:

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