问行数有限的DataGridView

EN

    int maxNumberOfRows = 6;

    private void dgv1_RowsAdded(object sender, DataGridViewRowsAddedEventArgs e)
    {
        CheckRowCount();
    }

    private void dgv1_RowsRemoved(object sender, DataGridViewRowsRemovedEventArgs e)
    {
        CheckRowCount();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        if (dgv1.Rows.Count < maxNumberOfRows)
            dgv1.Rows.Add("Row added by button");
        else
            dgv1.Rows[dgv1.CurrentCell.RowIndex].Cells[0].Value = "Row added by button";
    }

    private void CheckRowCount()
    {
        if (dgv1.Rows.Count <= maxNumberOfRows)
            dgv1.AllowUserToAddRows = true;
        else
            dgv1.AllowUserToAddRows = false;
    }