DataGridView多维表头设置

通过：dataGridView1.TopLeftHeaderCell.Value = "表头\n回车";设置表头。
DataGridView实现多维表头

在做信息管理系统时，很多中式报表都是多维的，要实现报表数据显示，通常要用到多维表头。然而，非常遗憾的是，Winform中DataGrid、DataGridView本身不提供多维表头设计，要实现多维报表只好利用第三方的控件。通过对DataGridView的扩展，利用标题行进行重绘，可实现多维表头的友好界面。下面是对多维表头的探讨和实现。

1、常用多表头制作方法

     a.第三方控件实现多维表头:FlexGrid--展示效果很好，就是数据量大加载时显示速度较慢。

     b.报表方式实现多维表头：CrystalReport、Grid++Report--通过预览方式实现数据显示

     c、DataGridView实现多维表头

2、DataGridView多维表头实现原理

     通过重绘标题栏进行多栏实现,通过RowSpan和ColSpan来进行合并，类似Html的Table实现方式。

3、调用方法

       private void Form1_Load(object sender, EventArgs e)
        {
            InitDataTable();
            InitDataGridView();
        }

        DataTable table = new DataTable();

        private void InitDataTable()
        {          

            DataColumn col;

            col = new DataColumn();
            col.ColumnName = "客户名称";
            table.Columns.Add(col);

            col = new DataColumn();
            col.ColumnName = "产品名称";
            table.Columns.Add(col);

            col = new DataColumn();
            col.ColumnName = "规格";
            table.Columns.Add(col);

            col = new DataColumn();
            col.ColumnName = "单位";
            table.Columns.Add(col);

            col = new DataColumn();
            col.ColumnName = "期初存货数量";
            col.DataType = System.Type.GetType("System.Decimal");
            table.Columns.Add(col);

            col = new DataColumn();
            col.ColumnName = "期初货款";
            col.DataType = System.Type.GetType("System.Decimal");
            table.Columns.Add(col);

            col = new DataColumn();
            col.ColumnName = "期初帐款";
            col.DataType = System.Type.GetType("System.Decimal");
            table.Columns.Add(col);

            col = new DataColumn();
            col.ColumnName = "发货数量";
            col.DataType = System.Type.GetType("System.Decimal");
            table.Columns.Add(col);

            col = new DataColumn();
            col.ColumnName = "发货金额";
            col.DataType = System.Type.GetType("System.Decimal");
            table.Columns.Add(col);

            col = new DataColumn();
            col.ColumnName = "开票数量";
            col.DataType = System.Type.GetType("System.Decimal");
            table.Columns.Add(col);

            col = new DataColumn();
            col.ColumnName = "开票金额";
            col.DataType = System.Type.GetType("System.Decimal");
            table.Columns.Add(col);

            col = new DataColumn();
            col.ColumnName = "回款数量";
            col.DataType = System.Type.GetType("System.Decimal");
            table.Columns.Add(col);

            col = new DataColumn();
            col.DataType = System.Type.GetType("System.Decimal");
            col.ColumnName = "回款金额";
            table.Columns.Add(col);

            col = new DataColumn();
            col.DataType = System.Type.GetType("System.Decimal");
            col.ColumnName = "未开票回款数量";
            table.Columns.Add(col);

            col = new DataColumn();
            col.DataType = System.Type.GetType("System.Decimal");
            col.ColumnName = "未开票回款金额";
            table.Columns.Add(col);

            col = new DataColumn();
            col.DataType = System.Type.GetType("System.Decimal");
            col.ColumnName = "期末存货数量";
            table.Columns.Add(col);

            col = new DataColumn();
            col.DataType = System.Type.GetType("System.Decimal");
            col.ColumnName = "期末应收货款";
            table.Columns.Add(col);

            col = new DataColumn();
            col.DataType = System.Type.GetType("System.Decimal");
            col.ColumnName = "期末应收帐款";
            table.Columns.Add(col);
        }

        private void  InitDataGridView()
        {
            MutilGridHeader topRow = new MutilGridHeader();
            topRow.SetRowCol(3, 18);

            //第一行
            topRow.Cells[0][0].Value = "客户";
            topRow.Cells[0][0].RowSpan = 3;

            topRow.Cells[0][1].Value = "产品名称";
            topRow.Cells[0][1].RowSpan = 3;

            topRow.Cells[0][2].Value = "规格";
            topRow.Cells[0][2].RowSpan = 3;

            topRow.Cells[0][3].Value = "单位";
            topRow.Cells[0][3].RowSpan = 3;

            topRow.Cells[0][4].Value = "期初";
            topRow.Cells[0][4].ColSpan = 3;

            topRow.Cells[0][7].Value = "本期";
            topRow.Cells[0][7].ColSpan = 8;

            topRow.Cells[0][15].Value = "期末";
            topRow.Cells[0][15].ColSpan = 3;


            //第二行
            topRow.Cells[1][4].Value = "存货数量";
            topRow.Cells[1][4].RowSpan = 2;

            topRow.Cells[1][5].Value = "应收货款";
            topRow.Cells[1][5].RowSpan = 2;

            topRow.Cells[1][6].Value = "应收帐款";
            topRow.Cells[1][6].RowSpan = 2;

            topRow.Cells[1][7].Value = "发货";
            topRow.Cells[1][7].ColSpan = 2;

            topRow.Cells[1][9].Value = "开票";
            topRow.Cells[1][9].ColSpan = 2;

            topRow.Cells[1][11].Value = "回款";
            topRow.Cells[1][11].ColSpan = 2;

            topRow.Cells[1][13].Value = "未开票回款";
            topRow.Cells[1][13].ColSpan = 2;

            topRow.Cells[1][15].Value = "存货数量";
            topRow.Cells[1][15].RowSpan = 2;

            topRow.Cells[1][16].Value = "应收货款";
            topRow.Cells[1][16].RowSpan = 2;

            topRow.Cells[1][17].Value = "应收票款";
            topRow.Cells[1][17].RowSpan = 2;

            //第三行
            topRow.Cells[2][7].Value = "数量";
            topRow.Cells[2][8].Value = "金额";
            topRow.Cells[2][9].Value = "数量";
            topRow.Cells[2][10].Value = "金额";
            topRow.Cells[2][11].Value = "数量";
            topRow.Cells[2][12].Value = "金额";
            topRow.Cells[2][13].Value = "数量";
            topRow.Cells[2][14].Value = "金额";


            dataGridViewEx1.Header = topRow;
            dataGridViewEx1.DataSource = table;
            table.DefaultView.AllowNew = false;

            dataGridViewEx1.Columns[0].Width = 120;
            dataGridViewEx1.Columns[1].Width = 100;
            dataGridViewEx1.Columns[2].Width = 80;
            for(int i = 2;i<18;i++)
                dataGridViewEx1.Columns[i].Width = 60;

        }

Datagridview 实现二维表头
      最近把我们的b/s系统,增加智能客户端的功能。确实智能客户端是非常好用的东西。可惜winform的控件功能不怎么强大,相比vb差很多啊。比如DataGridView不支持二维表头,不支持表尾合计,相比之下 web的好办多了（还是喜欢Web的排版、导航，但喜欢Win的操作性，希望WPF早日流行）。

       但是 MIS系统没有二维表头确实是客户不能接受的,尝试了com控件flexgrid或者开源的SourceGrid3，但都不怎么好用,于是想改造一下DataGridView。我的做法是在CellPainting做手脚。花了一天时间尝试，只是做出原型，还没有完善，希望有需要的朋友少走弯路。

  1,继承DataGridView，添加表头信息类。
  2，添加CellPainting，代码如下：

  private void DataGridViewEx_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
        {
            if (e.RowIndex == -1)
            {
             //   int w = dataGridView1.HorizontalScrollingOffset + dataGridView1.TopLeftHeaderCell.Size.Width + dataGridView1.Columns[0].Width + 10;


                Rectangle newRect = new Rectangle(e.CellBounds.X + 1,
               e.CellBounds.Y + 1, e.CellBounds.Width - 4,
               e.CellBounds.Height - 4);

                using (
                    Brush gridBrush = new SolidBrush(this.GridColor),
                    backColorBrush = new SolidBrush(e.CellStyle.BackColor))
                {
                    using (Pen gridLinePen = new Pen(gridBrush))
                    {
                        // Erase the cell.
                        e.Graphics.FillRectangle(backColorBrush, e.CellBounds);

                        // Draw the grid lines (only the right and bottom lines;
                        // DataGridView takes care of the others).
                        e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left,
                            e.CellBounds.Bottom - 1, e.CellBounds.Right - 1,
                            e.CellBounds.Bottom - 1);
                        if (e.ColumnIndex > -1 && topRow!=null&&topRow.Cells[e.ColumnIndex].ColSpan>1)
                        {
                            e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1,
                                e.CellBounds.Top + e.ClipBounds.Height / 2, e.CellBounds.Right - 1,
                                e.CellBounds.Bottom);
                        }
                        else
                        {
                            e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1,
                                                          e.CellBounds.Top, e.CellBounds.Right - 1,
                                                          e.CellBounds.Bottom);
                        }

                        // Draw the inset highlight box.
                        //   e.Graphics.DrawRectangle(Pens.Blue, newRect);

                        int scale = e.CellBounds.Height/3;
                        if (e.ColumnIndex > -1 && topRow.Cells[e.ColumnIndex].Text != null)
                        {
                            scale= e.CellBounds.Height / 2;
                            e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - e.CellBounds.Height / 2, e.CellBounds.Right, e.CellBounds.Bottom - e.CellBounds.Height / 2);
                        }
                        // Draw the text content of the cell, ignoring alignment.

                      

                        if (e.Value != null)
                        {
                            e.Graphics.DrawString(e.Value.ToString(), e.CellStyle.Font,
                                Brushes.Crimson, e.CellBounds.X + 2,
                                e.CellBounds.Y + scale+ 2, StringFormat.GenericDefault);



                        }




                        if (e.ColumnIndex > -1 &&  topRow.Cells[e.ColumnIndex].RelateIndex > -1 && topRow.Cells[e.ColumnIndex].Text!=null)
                    
                        {
                            Rectangle recCell = new Rectangle(e.CellBounds.X - 1 - topRow.Cells[e.ColumnIndex].SpanRowWith,
           e.CellBounds.Y + 1, topRow.Cells[e.ColumnIndex].SpanRowWith,
           e.CellBounds.Height / 2);


                            StringFormat sf = new StringFormat();

                            sf.Alignment = StringAlignment.Center;


                            e.Graphics.DrawString(topRow.Cells[e.ColumnIndex].Text, e.CellStyle.Font, Brushes.Crimson, recCell, sf);

                        }
               
                        e.Handled = true;
                    }
                }
            }

        }

3，调用方法

  dataGridViewEx1.TopRow.Cells[2].Text = "入库";
            dataGridViewEx1.TopRow.Cells[2].ColSpan = 2;


            dataGridViewEx1.TopRow.Cells[4].Text = "出库";
            dataGridViewEx1.TopRow.Cells[4].ColSpan = 2;

4，效果图

至于表尾合计，也做出了原型。二维表头+表尾合计，基本上满足需求了。
url: http://greatverve.cnblogs.com/archive/2012/07/17/TopLeftHeaderCell.html