C# winform combobox 在绑定数据之后插入一项选择项

 1          /**/ /// 

 2        /// 填充comboboxB超医师 [email protected] 涂聚文
 3        ///2009-02-16
 4        /// 

 5          private   void  setDBPyhNameComboBox()
 6          {
 7
 8            this.combPhy.DataSource = null;
 9
10            DBConnectioin dbc = new DBConnectioin();
11            SqlConnection conn = new SqlConnection(DBConnectioin.conStr);
12            conn.Open();
13            //DbHelperSQL.setComboList(combPhy, "select PhyID,PhyName  from Physician", "Physician", "PhyName", "PhyID");
14            string sSQL = "select PhyID,PhyName  from Physician";
15            string sTable = "Physician";
16
17 
18            DataSet dsCourtesy = new DataSet();
19            SqlDataAdapter daCourtesy = new SqlDataAdapter();
20            DbHelperSQL.setCommand(dsCourtesy, daCourtesy, sSQL, sTable);
21            daCourtesy.Fill(dsCourtesy);
22            combPhy.DataSource = dsCourtesy.Tables[0].DefaultView;              
23            DataRow dr = dsCourtesy.Tables[0].NewRow();
24            combPhy.DisplayMember = "PhyName";
25            combPhy.ValueMember = "PhyID";            
26            dr["PhyName"] = "全部";  
27            dr["PhyID"] = -1;  
28            dsCourtesy.Tables[0].Rows.InsertAt(dr, 0);
29            //combPhy.Text = "全部";
30
31
32        }

 ProductCatalogListBLL productCatalogListBLL = new ProductCatalogListBLL();
        /// 

        /// 
        /// 
        /// 
        /// 
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                BindClass();
            }
        }
        /// 

        /// 
        /// 
        void BindClass()
        {
            List list = productCatalogListBLL.get_List();
            foreach (ProductCatalogListInfo model in list)
            {
                ListItem li = new ListItem();
                li.Text = "╋" + model.ProductCatalogName;
                li.Value = model.ProductCatalogId.ToString();
                DropDownList1.Items.Add(li);
                BindChild(model.ProductCatalogId.ToString(), "├──");
            }
        }
        /// 

        /// 
        /// 
        /// 
        /// 
        void BindChild(string ParentID, string separator)
        {
            List list = productCatalogListBLL.get_List(ParentID);
            foreach (ProductCatalogListInfo model in list)
            {
                ListItem li = new ListItem();
                li.Text = separator + model.ProductCatalogName;
                li.Value = model.ProductCatalogId.ToString();
                DropDownList1.Items.Add(li);
                string separator_ = separator + "───";
                BindChild(model.ProductCatalogId.ToString(), separator_);
            }
        }

　　

 /// 

        /// 
        /// 
        /// 
        public List get_List()
        {
            List List = new List();
            DataTable dt = DBHelper.getDataSet("select * from ProductCatalogList where ProductCatalogParent=0 order by ProductCatalogId desc").Tables[0];
            foreach (DataRow dr in dt.Rows)
            {
                ProductCatalogListInfo model = new ProductCatalogListInfo();
                model.ProductCatalogId = Convert.ToInt32(dr["ProductCatalogId"]);
                model.ProductCatalogName = dr["ProductCatalogName"].ToString();
                model.ProductCatalogParent = Convert.ToInt32(dr["ProductCatalogParent"]);
                List.Add(model);
            }
            return List;
        }
        /// 

        /// 
        /// 
        /// 
        /// 
        public List get_List(string ParentID)
        {
            List List = new List();
            DataTable dt = DBHelper.getDataSet("select * from ProductCatalogList where ProductCatalogParent=" + ParentID + " order by ProductCatalogId desc").Tables[0];
            foreach (DataRow dr in dt.Rows)
            {
                ProductCatalogListInfo model = new ProductCatalogListInfo();
                model.ProductCatalogId = Convert.ToInt32(dr["ProductCatalogId"]);
                model.ProductCatalogName = dr["ProductCatalogName"].ToString();
                model.ProductCatalogParent = Convert.ToInt32(dr["ProductCatalogParent"]);
                List.Add(model);
            }
            return List;
        }