获取datagridview列中button点击事件

        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            if (e.ColumnIndex == 0)
            {
                string str = dataGridView1.Rows[e.RowIndex].Cells[0].Value.ToString();
                MessageBox.Show(str);
            }
        }