以编程方式更改DatagridView(.NET)上的选择

dataGridView1.CurrentCell = dataGridView1.Rows[rowIndex].Cells[columnIndex];

dataGridView1.Rows[rowIndex].Cells[columnIndex].Selected = true;

dataGridView1.ClearSelection();

foreach (DataGridViewRow row in dataGridView1.SelectedRows)
{
    // 处理选定的行
}

foreach (DataGridViewColumn column in dataGridView1.SelectedColumns)
{
    // 处理选定的列
}

dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;