C# DataGridView中创建可编辑下拉框

在DataGridView中创建下拉框，可直接选择备选值。源码已经上传，有需要可以下载参考。
真实显示效果如下图：

一. 先创建一个datagridview参数列表

                ParaTb = new DataTable();
                //添加列
                DataColumn[] Col = new DataColumn[2];
                for (ushort i = 0; i < Col.Length; i++)
                    Col[i] = new DataColumn();
                Col[0].ColumnName = "参数名称";
                Col[1].ColumnName = "参数值";
                ParaTb.Columns.AddRange(Col);

二. 设置创建的参数列表显示效果

                //设置行高
                for (byte i = 0; i < dataGridView1.Rows.Count; i++)
                    dataGridView1.Rows[i].Height = 25;
                //设置列宽
                int wd = (dataGridView1.Width - 10) / 3;
                dataGridView1.Columns[0].Width = wd * 2;
                dataGridView1.Columns[1].Width = wd;
                dataGridView1.Columns[0].ReadOnly = true;
                dataGridView1.Columns[1].ReadOnly = false;
                dataGridView1.Columns[0].SortMode = DataGridViewColumnSortMode.NotSortable;
                dataGridView1.Columns[1].SortMode = DataGridViewColumnSortMode.NotSortable;

                dataGridView1.ColumnHeadersDefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
                dataGridView1.ColumnHeadersDefaultCellStyle.Font = new Font("黑体", 9);
                dataGridView1.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
                dataGridView1.DefaultCellStyle.Font = new Font("黑体", 9);

                dataGridView1.RowHeadersVisible = false;
                dataGridView1.AllowUserToAddRows = false;
                dataGridView1.AllowUserToDeleteRows = false;
                dataGridView1.AllowUserToResizeColumns = false;
                dataGridView1.AllowUserToResizeRows = false;

                dataGridView1.MultiSelect = false;

三. 创建一个Combox下拉框控件

            cbbItemsList = new List<string>();
            cbb = new ComboBox();
            cbb.DropDownStyle = ComboBoxStyle.DropDown;
            cbb.BackColor = Color.LightGreen;
            cbb.ForeColor = Color.Black;
            cbb.Visible = false;

四. 将创建的Combox控件加入列表中

dataGridView1.Controls.Add(cbb);

五. 设置Combox下拉框控件的事件

1. 选中项索引变更事件

        private void cbb_SelectIndexChanged(object sender, EventArgs e)
        {
            ComboBox cbb = sender as ComboBox;
            cbb.Visible = false;
        }
        private void cbb_Leave(object sender, EventArgs e)
        {
            ComboBox cbb = sender as ComboBox;
            cbb.Visible = false;
        }

2. 可见性变更事件

        private void cbb_VisibleChanged(object sender, EventArgs e)
        {
            ComboBox cbb = sender as ComboBox;
            if (cbb.Visible == false)
            {
                if (dataGridView1.Contains(cbb))
                    dataGridView1.CurrentCell.Value = ((ComboBox)sender).Text;
                else
                    dataGridView1.CurrentCell.Value = ((ComboBox)sender).Text;
            }
        }

3. 下拉框有键盘输入事件

        private void cbb_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.D0 || e.KeyCode == Keys.NumPad0)
            {
                ComboBox cbb = sender as ComboBox;
                cbb.Visible = true;
                cbb.Focus();
                if (cbb.Text.Contains("*"))
                {
                    cbb.Text = "";
                    cbb.SelectionStart = 0;
                }
                else
                {
                    cbb.SelectionStart = cbb.Text.Length;
                }
            }
        }

六. 双击列表时，弹出Combox下拉框

                    Rectangle rectangle = dataGridView1.GetCellDisplayRectangle(dataGridView1.CurrentCell.ColumnIndex, dataGridView1.CurrentCell.RowIndex, false);
                    string value = dataGridView1.CurrentCell.Value.ToString();
                    cbb.Text = value;
                    cbb.Left = rectangle.Left;
                    cbb.Top = rectangle.Top;
                    cbb.Width = rectangle.Width;
                    cbb.Height = rectangle.Height;

                    cbb.Items.Clear();
                    cbbItemsList.Clear();
                    int rowIndex = e.RowIndex;

                    if (dataGridView1[0, rowIndex].Value.ToString().Contains("速度"))
                    {
                        cbbItemsList.Add("1000");
                        cbbItemsList.Add("2000");
                        cbbItemsList.Add("3000");
                        cbbItemsList.Add("5000");
                        cbb.Items.AddRange(cbbItemsList.ToArray());
                        cbb.Visible = true;
                        cbb.Focus();
                    }