经常在项目中遇到建立无限级树形菜单展示的效果,这里简单地做了一个,基本后台代码如下:
- private DataTable GetTable(int topid)
- {
- DataTable dt = null;
- try
- {
- string constr = "server=.;database=tqnpc;uid=sa;pwd=sa";
- string selstr = "select * from RW_工作关系 where main_id=" + topid + "";
- SqlConnection con = new SqlConnection(constr);
- SqlDataAdapter da = new SqlDataAdapter(selstr, con);
- dt = new DataTable();
- da.Fill(dt);
- }
- catch (Exception ex)
- {
- Response.Write(ex.Message);
- }
- return dt;
- }
- protected void MakeTree()
- {
- DataTable dt = GetTable(0);
- try
- {
- if (dt != null)
- {
- for (int i = 0; i < dt.Rows.Count; i++)
- {
- TreeNode tn = new TreeNode();
- tn.Text = dt.Rows[i]["MAIN_ID"].ToString();
- tn.Value = dt.Rows[i]["REF_ID"].ToString();
- tn.SelectAction = TreeNodeSelectAction.Select;
- TreeView1.Nodes.Add(tn);
- AddTreeNodes(int.Parse(dt.Rows[i]["REF_ID"].ToString()), int.Parse(dt.Rows[i]["REF_ID"].ToString()), tn);
- }
- }
- }
- catch (Exception ex)
- {
- Response.Write(ex.Message);
- }
- }
这个方法对数据库的结构也有一定的要求,数据库的设计如下:
