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最近项目中应用到　在一个主Datagridview嵌套另一个子DatagridView．

实现的思路: 在父 Datagridview 点击的当前行的下方，显示子Datagridview.

//Step 1        private void Form_Load(object sender, EventArgs e)        {            //dgv : Master grid            //dataGridView1: Detail grid                        dgv.Controls.Add(dataGridView1);            dataGridView1.Visible = false;        }        //Step 2        // text the rowheader of char '+' for each row in datagrid event: RowsAdded        private void dgv_RowsAdded(object sender, DataGridViewRowsAddedEventArgs e)        {            dgv.Rows[e.RowIndex].HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleLeft;            dgv.Rows[e.RowIndex].HeaderCell.Value = "+";        }        //Step 3        // set the position of the detail (sub) datagridview showing        private void dgv_RowHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)        {                       dgv.CurrentRow.HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleLeft;            dgv.CurrentRow.HeaderCell.Value = Convert.ToString(dgv.CurrentRow.HeaderCell.Value).Trim() == "+" ? "-" : "+"; // switch text the rowheader of char '+' or  '-'            int scrollRowIndex = dgv.FirstDisplayedScrollingRowIndex; // the first  row in the top of the  datagrid            if ((e.RowIndex - scrollRowIndex) > 10) // if the current row is the tenth row in the current page, set it to the top of the datagrid             {                dgv.FirstDisplayedScrollingRowIndex = e.RowIndex;            }                              //set the position of the detail (sub) datagridview"                    System.Drawing.Rectangle rect = dgv.GetCellDisplayRectangle(-1, e.RowIndex  , false);                    dataGridView1.Left = rect.Left;                    dataGridView1.Top = rect.Bottom ;                    dataGridView1.Width = dgv.Width ;                    dataGridView1.Height = dgv.Height;                    dataGridView1.Visible = Convert.ToString(dgv.CurrentRow.HeaderCell.Value).Trim() == "-" ? true : false; // show or hide the detail grid        }

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