这个问题有两种方法 第一种是用DataGridview中自带的DataGridViewTextBoxColumn 控件，第二种是动态添加combobox控件
方法一：
首先 窗体上拖拽一个 DataGridview
然后在这个DataGridview中添加两列DataGridViewTextBoxColumn （第一列叫A，第二列叫B）
然后绑定A代码
A.DataSource = ds.Tables[].DefaultView;
A.DisplayMember = "table_name";
A.ValueMember = "table_name";
((DataGridViewComboBoxColumn)dataGridView1.Columns[]).DefaultCellStyle.NullValue = "--请选择--"; //默认值
其次是绑定B代码
//当前选中行的第二列赋值
((DataGridViewComboBoxCell)dataGridView1.Rows[dataGridView1.CurrentCell.RowIndex].Cells[]).DataSource = ds.Tables[].DefaultView;
((DataGridViewComboBoxCell)dataGridView1.Rows[dataGridView1.CurrentCell.RowIndex].Cells[]).DisplayMember = "comments";
((DataGridViewComboBoxCell)dataGridView1.Rows[dataGridView1.CurrentCell.RowIndex].Cells[]).ValueMember = "column_name";
((DataGridViewComboBoxColumn)dataGridView1.Columns[]).DefaultCellStyle.NullValue = "--请选择--";
然后添加SelectedIndexChanged事件代码
private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
DataGridView dgv = (DataGridView)sender;
if (dgv.CurrentCell.OwningColumn.Name == "A")
{
ComboBox cb = (ComboBox)e.Control;
cb.SelectedIndexChanged += new EventHandler(comboBox_SelectedIndexChanged);
}
}
SelectedIndexChanged事件代码
public void comboBox_SelectedIndexChanged(object sender, EventArgs e)
{
ComboBox comboBox = (ComboBox)sender;
if (dataGridView1.CurrentCell.OwningColumn.Name == "表名")
{
if (comboBox.Text != "")
{
//这是绑定B的方法
DBFieldNote(comboBox.Text);
}
}
}
方法二：
首先实例化combobox对象
private ComboBox comboBox = new ComboBox();
private ComboBox cb = new ComboBox();
其次：
this.dataGridView1.Controls.Add(comboBox);//将控件添加到DataGridview中
DBTableName();//绑定comboBox
comboBox.Visible = false;
comboBox.SelectedIndexChanged += new EventHandler(comboBox_SelectedIndexChanged);//添加事件
private void comboBox_SelectedIndexChanged(object sender, EventArgs e)
{
string name = ((ComboBox)sender).Text;
dataGridView1.CurrentCell.Value = name;//将选中的值添加到DataGridview当前选中的单元格里
DBFieldNote(name);//绑定第二个combobox（也就是cb）
}
public void DBFieldNote(string tablename)
{
this.dataGridView1.Controls.Add(cb);
cb.Visible = false;
cb.SelectedIndexChanged += new EventHandler(cb_SelectedIndexChanged);
......
}
private void cb_SelectedIndexChanged(object sender, EventArgs e)
{
dataGridView1.CurrentCell.Value = cb.Text;
}
private void dataGridView1_CurrentCellChanged(object sender, EventArgs e)
{
if (dataGridView1.CurrentCell != null)
{
if (dataGridView1.CurrentCell.ColumnIndex == )//如果选中的是第一列 就显示第一个combobox
{
System.Drawing.Rectangle rect = dataGridView1.GetCellDisplayRectangle(dataGridView1.CurrentCell.ColumnIndex, dataGridView1.CurrentCell.RowIndex ，false);//获取当前选中的单元格的属性（宽 ，高等）
comboBox.Left = rect.Left;
comboBox.Top = rect.Top;
comboBox.Width = rect.Width;
comboBox.Height = rect.Height;
comboBox.Visible = true;
}
else if (dataGridView1.CurrentCell.ColumnIndex==)//如果是选中第二列就显示cb
{
System.Drawing.Rectangle rect1 = dataGridView1.GetCellDisplayRectangle(comboxIndex + , dataGridView1.CurrentCell.RowIndex, false);
cb.Left = rect1.Left;
cb.Top = rect1.Top;
cb.Width = rect1.Width;
cb.Height = rect1.Height;
cb.Visible = true;
}
}
else
{
comboBox.Visible = false;
}
}