最近发现这方面在社区内提问的不少，发个源代码，嘿嘿
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;
}
}
}