这里使用TreeNodePopulate事件加载各个节点，下面列出步骤：
1.假设有一个下面类似的类，一个简单的无限极分类的结构：
class Category
{
public string id { get; set; }
public string name { get; set; }
public string parentid { get; set; }
}
为了演示方便，列出一些模拟数据；
List<Category> list = null;
Category c1 = new Category { id = "1", name = "设计部门", parentid = "0" };
Category c2 = new Category { id = "2", name = "薪酬部门", parentid = "1" };
Category c3 = new Category { id = "3", name = "后勤部门", parentid = "1" };
Category c4 = new Category { id = "4", name = "会计部门", parentid = "0" };
Category c5 = new Category { id = "5", name = "慧眼部门", parentid = "4" };
Category c6 = new Category { id = "6", name = "模特部门", parentid = "4" };
Category c7 = new Category { id = "7", name = "交流中心", parentid = "0" };
Category c8 = new Category { id = "8", name = "会议交流", parentid = "0" };
list = new List<Category>
{
c1,c2,c3,c4,c5,c6,c7,c8
};
假设我们页面上要使用的控件ID为TreeView1;
在页面加载时候为其注册事件：
TreeView1.TreeNodePopulate += new TreeNodeEventHandler(TreeView1_TreeNodePopulate);
接下来我们手动写上树的根节点：
TreeNode tn = new TreeNode();
tn.Text = "公司栏目";
tn.Value = "0";
TreeNodeEventArgs args = new TreeNodeEventArgs(tn);
TreeView1_TreeNodePopulate(TreeView1, args);//这里去调用事件绑定节点
TreeView1.Nodes.Add(tn);
/////////
void TreeView1_TreeNodePopulate(object sender, TreeNodeEventArgs e)
{
List<Category> li = list.Where(x => x.parentid == e.Node.Value).ToList();
foreach (Category c in li)
{
TreeNode n = new TreeNode();
n.Text = c.name;
n.Value = c.id;
n.PopulateOnDemand = true;//注意这个属性设置
n.NavigateUrl = "files.aspx?folder;
n.SelectAction = TreeNodeSelectAction.Expand;
e.Node.ChildNodes.Add(n);
}
}
OK了。当然也完全可以递归去append各个节点。