我要评论效果：
数据库：
思路：
利用for遍历，然后创建父节点，再根据父节点创建出子节点。
代码：
using system;
using system.collections.generic;
using system.linq;
using system.web;
using system.web.ui;
using system.web.ui.webcontrols;
using system.data;
using system.collections;
using system.configuration;
using system.data.sqlclient;
namespace treeview
{
public partial class treeview : system.web.ui.page
{
string connection = configurationmanager.connectionstrings["sqlconnection"].tostring();
protected void page_load(object sender, eventargs e)
{
select();
createtree();
}
dataset ds = new dataset();
public dataset datas(string sql, string tablename)
{
sqlconnection con = new sqlconnection(connection);
sqldataadapter sqlda = new sqldataadapter(sql, con);
sqlda.fill(ds, tablename);
return ds;
}
//parentmenu:父节点,
//grade:标识这是第几级节点,
//flag:标识是不是尾结点，1是 0 不是,
//href:指向的链接
public void select()
{
string sql = "select * from treeview";
ds = datas(sql, "test");
}
public void createtree()
{
try
{
datatable dt = ds.tables["test"];
sortedlist sl = new sortedlist();
treenode tn = new treenode();
if (dt.rows.count <= 0)
{
tn.text = "空";
tn.value = "";
tn.navigateurl = "";
tn.target = "";
tn.expanded = false;
tn.selectaction = treenodeselectaction.selectexpand;
}
else
{
for (int i = 0; i < dt.rows.count; i++)
{
//创建父节点
if (dt.rows[i]["grade"].tostring() == "1")
{
treenode node = new treenode();
node.text = dt.rows[i]["menuname"].tostring();
node.value = dt.rows[i]["menuid"].tostring();
if (dt.rows[i]["flag"].tostring() == "1")
{
node.navigateurl = dt.rows[i]["href"].tostring();
tn.target = "_bank";
}
node.expanded = false;
node.selectaction = treenodeselectaction.expand;
sl.add(node.value, node);
tv_method.nodes.add(node);
}
else
{
//查找父节点
treenode parentnod = (treenode)sl.getbyindex(sl.indexofkey(dt.rows[i]["parentmenu"].tostring()));
//创建子节点
treenode tnchild = new treenode();
tnchild.text = dt.rows[i]["menuname"].tostring();
tnchild.value = dt.rows[i]["menuid"].tostring();
if (dt.rows[i]["flag"].tostring() == "1")
{
tnchild.navigateurl = dt.rows[i]["href"].tostring();
tnchild.target = "_bank";
}
tnchild.expanded = false;
tnchild.selectaction = treenodeselectaction.expand;
sl.add(tnchild.value, tnchild);
parentnod.childnodes.add(tnchild);
}
}
}
}
catch (exception ex)
{
throw ex;
}
}
}
}
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