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for (int i = 1; i <= 20; i++)
{
count = count + 1;
dataGridView1.Rows[i - 1].HeaderCell.Value = count.ToString();
}
/// <summary>
/// 添加序号
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void dgvData_RowsAdded(object sender, DataGridViewRowsAddedEventArgs e)
{
for (int i = 0; i < dgvData.Rows.Count; i++)
{
dgvData.Rows[i].Cells[你要显示序号的单元格索引或名称].Value = (i + 1).ToString();
}
}