最近经常看到关于DataGridView的Cell背景色、合并的提问，发个源代码
源代码也在blog上发布，有什么问题可以留言
http://blog.csdn.net/Samen168/archive/2007/01/23/1491310.aspx

private void Form1_Load(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt.Columns.Add( "A ");
dt.Columns.Add( "B ");
dt.Columns.Add( "C ");
dt.Columns.Add( "D ");
dt.Rows.Add(new object[] { "A1 ", "B1 ", "C1 ", "D1 " });
dt.Rows.Add(new object[] { "A2 ", "B2 ", "C2 ", "D2 " });
dt.Rows.Add(new object[] { "A3 ", "B3 ", "C3 ", "D3 " });
this.dataGridView1.DataSource = dt;

}

private void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{

if (e.RowIndex < 0 || e.RowIndex > = this.dataGridView1.Rows.Count - 1 || e.ColumnIndex == -1)
{
return;
}

// 假定需要将C列值为C3的单元格与前一单元格合并
if (e.ColumnIndex == 1 && this.dataGridView1[e.RowIndex, e.ColumnIndex + 1].Value.ToString() == "C3 ")
{
e.Handled = true;
}
if (e.ColumnIndex == 2 && e.Value.ToString() == "C3 ")
{

DataGridViewCell preCell = this.dataGridView1[e.ColumnIndex -1, e.RowIndex];
Rectangle re = new Rectangle(e.CellBounds.Left - this.dataGridView1.Columns[e.ColumnIndex - 1].Width
, e.CellBounds.Top, e.CellBounds.Width + this.dataGridView1.Columns[e.ColumnIndex - 1].Width, e.CellBounds.Height);
e.Graphics.FillRectangle(Brushes.White, re);

Pen pen = new Pen(this.dataGridView1.BackgroundColor,1);
pen.DashStyle = System.Drawing.Drawing2D.DashStyle.Solid;
e.Graphics.DrawLine(pen, re.X, re.Y + re.Height-1, re.X + re.Width, re.Y + re.Height-1);
e.Graphics.DrawLine(pen, re.X + re.Width -1, re.Y , re.X + re.Width -1, re.Y + re.Height);

SizeF strSize = e.Graphics.MeasureString(e.Value.ToString(), this.dataGridView1.Font);
e.Graphics.DrawString(e.Value.ToString(), this.dataGridView1.Font
, Brushes.Black, re.X, re.Y + (re.Height - strSize.Height) / 2);

e.Handled = true;
}
}

private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
if(e.RowIndex != -1 && e.ColumnIndex == 1 && e.Value != null && e.Value.ToString() == "B1 ")
{
e.CellStyle.BackColor = Color.Red;

e.CellStyle.ForeColor = Color.Blue;
e.CellStyle.SelectionBackColor = Color.BlueViolet;
}
}

}

[解决办法]
呵呵,有意思,看看先:)
[解决办法]
lz辛苦了，研究一下
[解决办法]
to 楼主:
借宝地问个问题
winform中加了DataGridView等一些控件,
相於dephi,pb的datawindow,我老觉得窗口绘制的慢
[解决办法]
有点意思。。

[解决办法]
顶个先！
[解决办法]
刷新还是有点问题,不过还行:)
[解决办法]
先顶后看好习惯
[解决办法]
显示还是存在一些问题，当双击被合并的空白区域时,被隐藏的数据又显示出来了
还期待老大进一步完善

[解决办法]
jf先！