C# 里TreeView绑定数据库实现分类

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1. //从数据库中读取数据   
2.             SqlConnection con = new SqlConnection("server=127.0.0.1\\sqlexpress;uid=sa;");   
3.             con.Open();   
4.             con.ChangeDatabase("STggggg");   
5.             SqlCommand cmd = new SqlCommand("select * from 产品树 where NodeType='f'", con);   
6.             //cmd.CommandType = CommandType.StoredProcedure;   
7.             SqlDataAdapter sda = new SqlDataAdapter(cmd);   
8.             DataSet ds = new DataSet();   
9.             try  
10.             {   
11.                 sda.Fill(ds);   
12.             }   
13.             catch  
14.             {   
15.             }   
16.             finally  
17.             {   
18.                 cmd = null;   
19.                 con.Close();   
20.             }   
21.             //往TreeView中添加树节点   
22.             //添加根节点   
23.             TreeNode tn = new TreeNode();   
24.             tn.Text = "所有产品";   
25.             tn.Name = "0";//Name作为ID   
26.             tn.Tag = "0";//Tag作为RootID   
27.             tn.ImageIndex = 0;   
28.             tn.SelectedImageIndex = 0;   
29.             tv.Nodes.Add(tn);//该TreeView命名为tv   
30.             tv.SelectedNode = tv.TopNode;   
31.             //把其他节点加上去   
32.             if (ds != null)   
33.             {  

//从数据库中读取数据             SqlConnection con = new SqlConnection("server=127.0.0.1\\sqlexpress;uid=sa;");             con.Open();             con.ChangeDatabase("STggggg");             SqlCommand cmd = new SqlCommand("select * from 产品树 where NodeType='f'", con);             //cmd.CommandType = CommandType.StoredProcedure;             SqlDataAdapter sda = new SqlDataAdapter(cmd);             DataSet ds = new DataSet();             try             {                 sda.Fill(ds);             }             catch             {             }             finally             {                 cmd = null;                 con.Close();             }             //往TreeView中添加树节点             //添加根节点             TreeNode tn = new TreeNode();             tn.Text = "所有产品";             tn.Name = "0";//Name作为ID             tn.Tag = "0";//Tag作为RootID             tn.ImageIndex = 0;             tn.SelectedImageIndex = 0;             tv.Nodes.Add(tn);//该TreeView命名为tv             tv.SelectedNode = tv.TopNode;             //把其他节点加上去             if (ds != null)             {

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1.                 foreach (DataRow dr in ds.Tables[0].Rows)   
2.                 {   
3.                     tn = new TreeNode();   
4.                     tn.Text = dr["Product"].ToString();   
5.                     tn.Name = dr["CateID"].ToString();//Name作为CateID   
6.                     tn.Tag = dr["RootID"].ToString();//Tag作为RootID   
7.                     tn.ImageIndex = 1;   
8.                     tn.SelectedImageIndex = 1;   
9.                     //判断是否为主节点   
10.                     if (dr["CateID"].ToString() == dr["RootID"].ToString())   
11.                     {   
12.                         //主节点   
13.                         tv.SelectedNode = tv.TopNode;   
14.                     }   
15.                     else  
16.                     {   
17.                         //其他节点   
18.                         if (tv.SelectedNode.Name != dr["ParentID"].ToString())   
19.                         {   
20.                             TreeNode[] tn_temp = tv.Nodes.Find(dr["ParentID"].ToString(), true); //通过ParentID查找父节点   
21.                             if (tn_temp.Length > 0)   
22.                             {   
23.                                 tv.SelectedNode = tn_temp[0]; //选中查找到的节点   
24.                             }   
25.                         }   
26.                     }   
27.                     tv.SelectedNode.Nodes.Add(tn);   
28.                 }   
29.                 //tv.ExpandAll();//展开TreeView   
30.                 tv.SelectedNode = tv.TopNode; //最顶端节点选中   
31.