调试易

这是我以前写的代码，你可以看看在Load里面要先把需要显示到DataGridView的ComboBox Add到DataGridView里面参数说明currentCell:要显示ComboBox的DataGridViewCell （单元格）
cmb：要显示的ComboBox控件
private void DisplayComboBox(DataGridViewCell currentCell, ComboBox cmb)
        {
            Rectangle rect = dgvInputData.GetCellDisplayRectangle(currentCell.ColumnIndex, currentCell.RowIndex, false);
            cmb.Width = rect.Width;
            cmb.Height = rect.Height;
            cmb.Top = rect.Top;
            cmb.Left = rect.Left;
            cmb.Visible = true;
            if (currentCell.Value != null)
                cmb.Text = currentCell.Value.ToString();
        }

那个combobox私有成员可以去掉了。  
 private void Form1_Load(object sender, EventArgs e)
        {
            this.dataGridView1.DataSource =DataGridBindData();
       
        DataTable dtSex = new DataTable();
            dtSex.Columns.Add("Value");
            dtSex.Columns.Add("Name");
            DataRow drSex;
            drSex = dtSex.NewRow();
            drSex[0] = "1";
            drSex[1] = "男";
            dtSex.Rows.Add(drSex);
            drSex = dtSex.NewRow();
            drSex[0] = "0";
            drSex[1] = "女";
            dtSex.Rows.Add(drSex);
             ///
            DataGridViewComboBoxColumn cbx = new DataGridViewComboBoxColumn();
            cbx.DataSource = dtSex.DefaultView;
            cbx.ValueMember = "Value";
            cbx.DisplayMember = "Name";
            cbx.HeaderText = "Sex";
            this.dataGridView1.Columns.Add(cbx); }

用DataGridViewComboBoxColumn 的话 很多ComboBox特有的功能无法使用，用ComboBox的话，可以很好的对ComboBox进行控制，这是个很好的办法，一般的话，我觉得还是不用DataGridViewComboBoxColumn比较好。呵呵。

3楼的前辈！照你的方法！在第三列只有选择了之后才能出现下拉内容！并不是在load完了就显示！

2楼的前辈！在From_load事件里应该如何调用！那我怎么又绑定到第三列里

4楼前辈 DataGridViewComboBoxColumn 应该怎么用！

参考我上面发的链接是将time控件加到datagridview上面,同样你将它换成ComboBox一样可以用

我发的连接你看不懂?照上面的做就是啦,将time控件换成ComboBox就是了

在GridView控件的数据绑定时间里加上就行了。

这是在DataGridView的第一列添加ComboBox的：
        string str2 = "SELECT Top 10 Title, EmployeeID, ReportsTo, PostalCode FROM Employees";
        private DataTable GetData(string strSQl)
        {
            DataTable dtData = new DataTable();
            using (SqlConnection thisConnection = new SqlConnection(
               @"Data Source=.;Initial Catalog=Northwind;Integrated Security=True"))
            {
                using (SqlDataAdapter thisAdapter = new SqlDataAdapter(
                    strSQl, thisConnection))
                {
                    thisAdapter.Fill(dtData);
                }
                thisConnection.Close();
            }
            return dtData;
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            DataTable dtSource = GetData(str2);
            this.dataGridView1.Columns.Add("Title", "Title");
            this.dataGridView1.Columns.Add("EmployeeID", "EmployeeID");
            this.dataGridView1.Columns.Add("ReportsTo", "ReportsTo");
            this.dataGridView1.Columns.Add("PostalCode", "PostalCode");
            this.dataGridView1.Columns[0].Width = 200;            foreach (DataRow dr in dtSource.Rows)
            {
                this.dataGridView1.Rows.Add(dr[0], dr[1], dr[2], dr[3]);
            }            ExDataGridView exDgv = new ExDataGridView(this.dataGridView1, dtSource);
            exDgv.BindControl();
        }    /// <summary>
    /// DataGridView的扩展: 在DataGridView上添加子控件
    /// </summary>
    public class ExDataGridView
    {
        private ComboBox cbTitle = new ComboBox();        private DataGridView dtModel;                           // DataGridView实例
        private DataTable dtSource = null;                      // 数据表
        private BindingSource tBindingSource = null;            // 绑定源        public ExDataGridView(DataGridView model,DataTable source)
        {
            this.dtModel = model;
            this.dtSource = source;
        }        /// <summary>
        ///  在DataGridView上绑定控件
        /// </summary>
        public void BindControl()
        {
            this.tBindingSource = new BindingSource();
            this.tBindingSource.DataSource = this.dtSource.DefaultView;            this.cbTitle.Visible = false;          //置控件为不可见属性
            this.dtModel.Controls.Add(cbTitle);            this.cbTitle.DisplayMember = "Title";
            this.cbTitle.DataSource = tBindingSource.DataSource;
            this.cbTitle.DropDownStyle = ComboBoxStyle.DropDown;
            this.cbTitle.SelectedIndexChanged += new EventHandler(Combox_SelectedIndexChanged);            this.dtModel.ReadOnly = true;
            this.dtModel.CurrentCellChanged += new EventHandler(DataGridView_CurrentCellChanged);
            this.dtModel.Scroll += new ScrollEventHandler(DataGridView_Scroll);
            this.dtModel.ColumnWidthChanged += new DataGridViewColumnEventHandler(DataGridView_ColumnWidthChanged);
        }        #region 私有的方法
        //隐藏指定控件
        private void HideControl()
        {
            this.cbTitle.Visible = false;
        }
        // 当用户单击至指定位置时显示相应控件
        private void DataGridView_CurrentCellChanged(object sender, EventArgs e)
        {
            HideControl();            //得到单元格表示区域的矩形
            if (this.dtModel.CurrentCell == null)
                return;
            Rectangle rect = this.dtModel.GetCellDisplayRectangle(this.dtModel.CurrentCell.ColumnIndex,
                this.dtModel.CurrentCell.RowIndex, false);            string cellValue = (this.dtModel.CurrentCell.Value == null) ? string.Empty :
            this.dtModel.CurrentCell.Value.ToString();            if (this.dtModel.CurrentCell.ColumnIndex == 0)         // 单击第一列时显示列表控件
            {
                this.cbTitle.Location = new Point(rect.Left, rect.Top);
                this.cbTitle.Size = new Size(rect.Width, rect.Height);
                this.cbTitle.BackColor = Color.Yellow;
                this.cbTitle.Visible = true;
                this.cbTitle.Text = cellValue;
            }
        }
        //  滚动DataGridView时将下拉列表框设为不可见
        private void DataGridView_Scroll(object sender, ScrollEventArgs e)
        {
            HideControl();
        }
        //  改变DataGridView列宽时将下拉列表框设为不可见
        private void DataGridView_ColumnWidthChanged(object sender, DataGridViewColumnEventArgs e)
        {
            HideControl();
        }
        //  当用户选择下拉列表框时改变DataGridView单元格的内容
        private void Combox_SelectedIndexChanged(object sender, EventArgs e)
        {
            this.dtModel.CurrentCell.Value = ((ComboBox)sender).Text;
        }
        #endregion
    }

不知道是不是你要的。
        DataGridViewComboBoxColumn cmb_Temp = new DataGridViewComboBoxColumn();
        DataGridViewTextBoxColumn text1 = new DataGridViewTextBoxColumn();
        DataGridViewTextBoxColumn text2 = new DataGridViewTextBoxColumn();
        //这里是绑定ComboBox的值
        DataTable BindSex()
        {
            DataTable dtSex = new DataTable();
            dtSex.Columns.Add("Value");
            dtSex.Columns.Add("Name");
            DataRow drSex;
            drSex = dtSex.NewRow();
            drSex[0] = "1";
            drSex[1] = "男";
            dtSex.Rows.Add(drSex);
            drSex = dtSex.NewRow();
            drSex[0] = "0";
            drSex[1] = "女";
            dtSex.Rows.Add(drSex);
            return dtSex;
        }
        //这里绑定DataGrideView的值
        DataTable DataGridBindData()
        {
            DataTable dtData = new DataTable();
            dtData.Columns.Add("ID");
            dtData.Columns.Add("Name");
            dtData.Columns.Add("Sex");
            DataRow drData;
            drData = dtData.NewRow();
            drData[0] = 1;
            drData[1] = "张三";
            drData[2] = "1";
            dtData.Rows.Add(drData);
            drData = dtData.NewRow();
            drData[0] = 2;
            drData[1] = "李四";
            drData[2] = "1";
            dtData.Rows.Add(drData);
            drData = dtData.NewRow();
            drData[0] = 3;
            drData[1] = "王五";
            drData[2] = "1";
            dtData.Rows.Add(drData);
            drData = dtData.NewRow();
            drData[0] = 4;
            drData[1] = "小芳";
            drData[2] = "0";
            dtData.Rows.Add(drData);
            drData = dtData.NewRow();
            drData[0] = 5;
            drData[1] = "小娟";
            drData[2] = "0";
            dtData.Rows.Add(drData);
            drData = dtData.NewRow();
            drData[0] = 6;
            drData[1] = "赵六";
            drData[2] = "1";
            dtData.Rows.Add(drData);
            return dtData;
        }        private void Form2_Load(object sender, EventArgs e)
        {
            text1.DataPropertyName = "ID";
            text1.HeaderText = "ID";
            text2.DataPropertyName = "Name";
            text2.HeaderText = "Name";
            cmb_Temp.DataPropertyName = "Sex";
            cmb_Temp.DisplayMember = "Name";
            cmb_Temp.ValueMember = "Value";
            cmb_Temp.HeaderText = "Sex";
            cmb_Temp.DataSource = BindSex();            dataGridView1.Columns.AddRange(new DataGridViewColumn[] { text1, text2, cmb_Temp });
            dataGridView1.DataSource = DataGridBindData();
        }

要么用combox列好么

        public Form1()
        {
            InitializeComponent();            this.dataGridView1.DataSource = DataGridBindData();
            this.dataGridView1.EditingControlShowing += new DataGridViewEditingControlShowingEventHandler(dataGridView1_EditingControlShowing);
            cmb_Temp.KeyPress += new KeyPressEventHandler(cmb_Temp_KeyPress);
            cmb_Temp.FlatStyle = FlatStyle.Flat;
        }        void cmb_Temp_KeyPress(object sender, KeyPressEventArgs e)
        {
            DataGridView DGV = (DataGridView)sender;            DGV.CurrentCell.Value = cmb_Temp.Text;
        }        void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
        {
            DataGridView DGV=(DataGridView )sender ;            if (DGV.Columns [ DGV.CurrentCell.ColumnIndex].DataPropertyName =="Sex")
            {
                cmb_Temp.Text = e.Control.Text;                cmb_Temp.Parent = DGV.EditingPanel;
                cmb_Temp.Size = DGV.GetCellDisplayRectangle(DGV.CurrentCell.ColumnIndex,
                    DGV.CurrentCell.RowIndex, false).Size;
                cmb_Temp.BringToFront();                BindSex();
            }
        }

#15楼前辈~  您的代码我能通过验证！但是DataGrideView一加载显示的sex是0、1这样的项！
当点击一下才出来下拉框男、女！

我不一定非得用ComboBox是下拉框就行！我要的结果如下示例：
id  Name  Sex
1    张三   男(下拉)
2    李四   男(下拉)
3    王五   男(下拉)
4    小芳   女(下拉)也就是这样的结果！

#14楼的前辈您的代码可以用！但是有一个小小的问题！这里绑定的DataGrideView下面还有空行，空行里也有一个下拉框能去掉吗！因为DataTable里有六条数据，DataGrideView总富余出来一行怎么办！

加一句   
dataGridView1.AllowUserToAddRows = false;

哦~~行了！那您的意思就是每一列都得指定它的类型了！
DataGridViewComboBoxColumn cmb_Temp = new DataGridViewComboBoxColumn();
        DataGridViewTextBoxColumn text1 = new DataGridViewTextBoxColumn();
        DataGridViewTextBoxColumn text2 = new DataGridViewTextBoxColumn();

可以不用text1和text2
dataGridView1.Columns.AddRange(new DataGridViewColumn[] { cmb_Temp });

那要加个事件了，而且其它部分也要改
public Form1()
        {
            InitializeComponent();            this.dataGridView1.DataSource = DataGridBindData();
            this.dataGridView1.EditingControlShowing += new DataGridViewEditingControlShowingEventHandler(dataGridView1_EditingControlShowing);
            cmb_Temp.DropDownClosed += new EventHandler(cmb_Temp_DropDownClosed);
            cmb_Temp.FlatStyle = FlatStyle.Flat;            cmb_Temp.Parent = this; // 让绑定起作用，第一次SelectedValue才有效
            cmb_Temp.Visible = false;
            BindSex();            this.dataGridView1.CellFormatting += new DataGridViewCellFormattingEventHandler(dataGridView1_CellFormatting);
        }        void cmb_Temp_DropDownClosed(object sender, EventArgs e)
        {
            this.dataGridView1.CurrentCell.Value = cmb_Temp.SelectedValue;
        }        void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
            DataGridView DGV = (DataGridView)sender;            if (DGV.Columns[e.ColumnIndex].DataPropertyName == "Sex")
                if (e.Value != null)
                    if (e.Value.ToString() == "1")
                        e.Value = "男";
                    else if (e.Value.ToString() == "0")
                        e.Value = "女";        }        void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
        {
            DataGridView DGV = (DataGridView)sender;            cmb_Temp.Visible = true;            if (DGV.Columns[DGV.CurrentCell.ColumnIndex].DataPropertyName == "Sex")
            {
                if (e.Control.Text == "男")
                    cmb_Temp.SelectedValue = 1;
                else if (e.Control.Text == "女")
                    cmb_Temp.SelectedValue = 0;                cmb_Temp.Parent = DGV.EditingPanel;
                cmb_Temp.Size = DGV.GetCellDisplayRectangle(DGV.CurrentCell.ColumnIndex,
                    DGV.CurrentCell.RowIndex, false).Size;
                cmb_Temp.BringToFront();
            }
        }

把DataGrideView的　AllowUserToAddRows　属性设置为　False　就行了。