关于.net 演示中tree懒加载的问题 - jQuery MiniUI

public void LoadNodes()
{
String id = Request["id"];
if (String.IsNullOrEmpty(id)) id = "-1";
//获取下一级节点
String sql = "select * from plus_file where pid = '" + id + "' order by updatedate";
ArrayList folders = DBUtil.Select(sql);
//判断节点，是否有子节点。如果有，则处理isLeaf和expanded。
for (int i = 0, l = folders.Count; i < l; i++)
{
Hashtable node = (Hashtable)folders[i];
String nodeId = node["id"].ToString();
String sql2 = "select * from plus_file where pid = '" + nodeId + "' order by updatedate";
ArrayList nodes = DBUtil.Select(sql2);
if (nodes.Count > 0)
{
node["isLeaf"] = false;
node["expanded"] = false;
}
}
//返回JSON
String json = PluSoft.Utils.JSON.Encode(folders);
Response.Write(json);
}

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