这里有一个对我有用的解决方案。最后的方法就是我在添加/删除行时刷新数据网格的方法。

private void btnUkloniStavku_Click(object sender, EventArgs e)
{
    string connectionString = ConfigurationManager.ConnectionStrings["MariaDBConnectionString"].ConnectionString;
    if (drvniSortimentGridView.SelectedRows.Count > 0)
    {
        using (MySqlConnection konekcija = new MySqlConnection(connectionString))
        {
            konekcija.Open();
            int odabraniIndex = drvniSortimentGridView.SelectedRows[0].Index;
            int redID = int.Parse(drvniSortimentGridView[0, odabraniIndex].Value.ToString());
            string upit = "DELETE FROM drvnisortiment WHERE sortimentID=@SortimentID";
            using (MySqlCommand cmd = new MySqlCommand(upit, konekcija))
            {
                MySqlParameter RowParameter = new MySqlParameter();
                RowParameter.ParameterName = "@SortimentID";
                RowParameter.MySqlDbType = MySqlDbType.Int32;
                RowParameter.IsNullable = false;
                RowParameter.Value = redID;

                cmd.Parameters.Add(RowParameter);
                cmd.ExecuteNonQuery();
            }
        }
    }
    OsvjeziGrid();
}

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