C# と VB.NET の質問掲示板

■No55231 (DD. さん) に返信
> SelectionModeにRowHeaderSelectとColumnHeaderSelectを同時指定するような動作は可能なのでしょうか？

private void Form1_Load(object sender, EventArgs e)
{
    dataGridView1.DataSource = null;
    dataGridView1.AllowUserToAddRows = false;
    dataGridView1.ColumnCount = 5;
    dataGridView1.RowCount = 20;
    dataGridView1.Dock = DockStyle.Fill;

    dataGridView1.SelectionMode = DataGridViewSelectionMode.CellSelect;
    dataGridView1.MultiSelect = true;

    dataGridView1.Tag = null;
    dataGridView1.SelectionChanged += delegate
    {
        if (dataGridView1.Tag == null)
        {
            dataGridView1.Tag = new object();
            Point pt = dataGridView1.CurrentCellAddress;
            dataGridView1.ClearSelection();
            for (int c = 0; c < dataGridView1.ColumnCount; c++)
            {
                dataGridView1[c, pt.Y].Selected = true;
            }
            for (int r = 0; r < dataGridView1.RowCount; r++)
            {
                dataGridView1[pt.X, r].Selected = true;
            }
            dataGridView1.Tag = null;
        }
    };
}