问Datagridview cell.value =DatagridviewComboboxCell.value

EN

public class Item
        {
            public string Name { get; set; }
            public int Id { get; set; }
        }

private void Form1_Load(object sender, EventArgs e)
        {
            dataGridView1.Columns.Add("test1", "test1");
            DataGridViewComboBoxColumn testCol = new DataGridViewComboBoxColumn();
            testCol.HeaderText = "comboValues";
            dataGridView1.Columns.Add(testCol);
            dataGridView1.Columns.Add("test2", "test1");
            List<Item> items = new List<Item>();
            items.Add(new Item() { Name = "One", Id = 1 });
            items.Add(new Item() { Name = "Two", Id = 2 }); // created two Items 
            var cbo = dataGridView1.Columns[1] as DataGridViewComboBoxColumn; // index of 1 is the comboboxColumn
            cbo.DataSource = items; // setting datasource 
            cbo.ValueMember = "Id";
            cbo.DisplayMember = "Name";
            dataGridView1.Rows.Add("", items[1].Id, "test1");
            dataGridView1.Rows.Add("", items[0].Id, "test2");
            dataGridView1.Rows.Add("", items[1].Id, "test3"); // and test rows
        }

int previousRowIndex = 0; // a variable to keep the index of row
        private void dataGridView1_RowLeave(object sender, DataGridViewCellEventArgs e)
        {
            previousRowIndex = e.RowIndex;
        }

private void dataGridView1_SelectionChanged(object sender, EventArgs e)
        {
            dataGridView1.Rows[previousRowIndex].Cells[0].Value = ""; // first set the previous row's first cell value empty string.
            DataGridViewComboBoxCell comboCell = dataGridView1.CurrentRow.Cells[1] as DataGridViewComboBoxCell; 
            dataGridView1.CurrentRow.Cells[0].Value = comboCell.EditedFormattedValue; // then set the first cell's value as the combobox's selected value.
        }