C# 里TreeView绑定数据库实现分类

codes=c#]

//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)

{[/codes][codes=c#]

foreach (DataRow dr in ds.Tables[0].Rows)

{

tn = new TreeNode();

tn.Text = dr["Product"].ToString();

tn.Name = dr["CateID"].ToString();//Name作为CateID

tn.Tag = dr["RootID"].ToString();//Tag作为RootID

tn.ImageIndex = 1;

tn.SelectedImageIndex = 1;

//判断是否为主节点

if (dr["CateID"].ToString() == dr["RootID"].ToString())

{

//主节点

tv.SelectedNode = tv.TopNode;

}

else

{

//其他节点

if (tv.SelectedNode.Name != dr["ParentID"].ToString())

{

TreeNode[] tn_temp = tv.Nodes.Find(dr["ParentID"].ToString(), true); //通过ParentID查找父节点

if (tn_temp.Length > 0)

{

tv.SelectedNode = tn_temp[0]; //选中查找到的节点

}

}

}

tv.SelectedNode.Nodes.Add(tn);

}

//tv.ExpandAll();//展开TreeView

tv.SelectedNode = tv.TopNode; //最顶端节点选中

}

[/codes]