c#datagridview第一行前两列合并单元格

要将 C# DataGridView 中的第一行前两列合并为一个单元格，可以使用以下代码：

dataGridView1.Rows[0].Cells[0].Value = "合并单元格";
dataGridView1.Rows[0].Cells[1].Value = "";
dataGridView1.Rows[0].Cells[1].Style.BackColor = Color.White;
dataGridView1.Rows[0].Cells[1].Style.SelectionBackColor = Color.White;
dataGridView1.Rows[0].Cells[1].ReadOnly = true;
dataGridView1.Rows[0].Cells[1].Style.NullValue = null;
dataGridView1.Rows[0].Cells[1].Style.ForeColor = Color.White;
dataGridView1.Rows[0].Cells[1].Style.SelectionForeColor = Color.White;
dataGridView1.Rows[0].Cells[2].Selected = false;
dataGridView1.Rows[0].Cells[3].Selected = false;
dataGridView1.Rows[0].Cells[1].Selected = false;
dataGridView1.Rows[0].Cells[0].Selected = false;
dataGridView1.Rows[0].Height = 35;
dataGridView1.Rows[0].Cells[0].Style.Alignment = DataGridViewContentAlignment.MiddleCenter;
dataGridView1.Rows[0].Cells[1].Style.Alignment = DataGridViewContentAlignment.MiddleCenter;
dataGridView1.Rows[0].Cells[0].Style.Font = new Font(DataGridView.DefaultFont, FontStyle.Bold);
dataGridView1.Rows[0].Cells[1].Style.Font = new Font(DataGridView.DefaultFont, FontStyle.Bold);
dataGridView1.Rows[0].Cells[0].Style.BackColor = Color.LightGray;
dataGridView1.Rows[0].Cells[0].Style.SelectionBackColor = Color.LightGray;
dataGridView1.Rows[0].Cells[1].Style.BackColor = Color.LightGray;
dataGridView1.Rows[0].Cells[1].Style.SelectionBackColor = Color.LightGray;
dataGridView1.Rows[0].Cells[0].Style.SelectionForeColor = Color.Black;

这段代码将第一行第一列和第二列合并，并将单元格的背景颜色设置为灰色，文本居中，字体加粗，并禁止编辑。