玩转DataGridView之行的展开与收缩

插入子节点：

 
string isEx=this.dataGridView1.Rows[e.RowIndex].Cells["IsEx"].Value.ToString();  
            if (this.dataGridView1.Columns[e.ColumnIndex].Name == "EX" && isEx=="false")  
            {  
                string id = this.dataGridView1.Rows[e.RowIndex].Cells["ID"].Value.ToString();  
                DataTable table = GetDataTable("select * from Department where DparentId="+id);  
                if (table.Rows.Count > 0)  
                {  
                    //插入行  
                    this.dataGridView1.Rows.Insert(e.RowIndex+1, table.Rows.Count);  
                    for (int i = 0; i < table.Rows.Count; i++)  
                    {  
                        DataGridViewRow row = this.dataGridView1.Rows[e.RowIndex + i+1];  
                        row.DefaultCellStyle.BackColor = Color.CadetBlue;  
                        row.Cells["ID"].Value = table.Rows[i]["ID"];  
                        row.Cells["DName"].Value = table.Rows[i]["DName"];  
                        row.Cells["Daddress"].Value = table.Rows[i]["Daddress"];  
                        row.Cells["Dtelphone"].Value = table.Rows[i]["Dtelphone"];  
                    }  
                }  
                //将IsEx设置为true，标明该节点已经展开  
                this.dataGridView1.Rows[e.RowIndex].Cells["IsEx"].Value = "true";  
                this.dataGridView1.Rows[e.RowIndex].Cells["EX"].Value = "-"; 

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