http://www.cnblogs.com/neuhawk/archive/2006/09/28/517507.html
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,DataGridViewCellPaintingEventArgse)
{
if (e.RowIndex == - 1 )
{
// intw=dataGridView1.HorizontalScrollingOffset+dataGridView1.TopLeftHeaderCell.Size.Width+dataGridView1.Columns[0].Width+10;
RectanglenewRect = new Rectangle(e.CellBounds.X + 1 ,
e.CellBounds.Y + 1 ,e.CellBounds.Width - 4 ,
e.CellBounds.Height - 4 );
using (
BrushgridBrush = new SolidBrush( this .GridColor),
backColorBrush = new SolidBrush(e.CellStyle.BackColor))
{
using (PengridLinePen = new Pen(gridBrush))
{
// Erasethecell.
e.Graphics.FillRectangle(backColorBrush,e.CellBounds);
// Drawthegridlines(onlytherightandbottomlines;
// DataGridViewtakescareoftheothers).
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.Top + e.ClipBounds.Height / 2 ,
e.CellBounds.Bottom);
}
else
{
e.Graphics.DrawLine(gridLinePen,
e.CellBounds.Top,
e.CellBounds.Bottom);
}
// DrawtheinsethighlightBox.
// 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.Bottom - e.CellBounds.Height / 2 ,e.CellBounds.Right,e.CellBounds.Bottom - e.CellBounds.Height / 2 );
}
// Drawthetextcontentofthecell,ignoringalignment.
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 )
@H_771_502@{
RectanglerecCell = new Rectangle(e.CellBounds.X - 1 - topRow.Cells[e.ColumnIndex].SpanRowWith,topRow.Cells[e.ColumnIndex].SpanRowWith,
e.CellBounds.Height / 2 );
StringFormatsf = new StringFormat();
sf.Alignment = StringAlignment.Center;
e.Graphics.DrawString(topRow.Cells[e.ColumnIndex].Text,Brushes.Crimson,recCell,sf);
}
e.Handled = true ;
}
}
}
}
{
if (e.RowIndex == - 1 )
{
// intw=dataGridView1.HorizontalScrollingOffset+dataGridView1.TopLeftHeaderCell.Size.Width+dataGridView1.Columns[0].Width+10;
RectanglenewRect = new Rectangle(e.CellBounds.X + 1 ,
e.CellBounds.Y + 1 ,e.CellBounds.Width - 4 ,
e.CellBounds.Height - 4 );
using (
BrushgridBrush = new SolidBrush( this .GridColor),
backColorBrush = new SolidBrush(e.CellStyle.BackColor))
{
using (PengridLinePen = new Pen(gridBrush))
{
// Erasethecell.
e.Graphics.FillRectangle(backColorBrush,e.CellBounds);
// Drawthegridlines(onlytherightandbottomlines;
// DataGridViewtakescareoftheothers).
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.Top + e.ClipBounds.Height / 2 ,
e.CellBounds.Bottom);
}
else
{
e.Graphics.DrawLine(gridLinePen,
e.CellBounds.Top,
e.CellBounds.Bottom);
}
// DrawtheinsethighlightBox.
// 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.Bottom - e.CellBounds.Height / 2 ,e.CellBounds.Right,e.CellBounds.Bottom - e.CellBounds.Height / 2 );
}
// Drawthetextcontentofthecell,ignoringalignment.
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 )
@H_771_502@{
RectanglerecCell = new Rectangle(e.CellBounds.X - 1 - topRow.Cells[e.ColumnIndex].SpanRowWith,topRow.Cells[e.ColumnIndex].SpanRowWith,
e.CellBounds.Height / 2 );
StringFormatsf = new StringFormat();
sf.Alignment = StringAlignment.Center;
e.Graphics.DrawString(topRow.Cells[e.ColumnIndex].Text,Brushes.Crimson,recCell,sf);
}
e.Handled = true ;
}
}
}
}
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 ;
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。