ASP.NET中基于JQUERY的高性能的TreeView补充

代码如下：

<script src="js/jquery-1.4.2.min.js" type="text/javascript"></script> 
<script src="js/jquery.mytree.js" type="text/javascript"></script> 
<link href="second.css" rel="stylesheet" type="text/css" /> 
<script type="text/javascript"> 
$(function(){ 
var o = { showcheck: true}; 
o.data =<%=treeNodes %>; 
$("#tree").treeview(o); 
}) 
</script>

代码如下：

public string GetFirJson() 
{ 
string mystr = "["; 
DataTable dt = DBUtility.db.ExecuteTable("select * from class where parientid=0"); 
int a = dt.Rows.Count; 
for (int i = 0; i <= dt.Rows.Count - 1; i++) 
{ 
mystr += GetOtherJson(Convert.ToInt32(dt.Rows[i]["classid"].ToString())) + ","; 
} 
mystr = mystr.Substring(0, mystr.Length - 1); 
mystr += "]"; 
mystr = mystr.Replace("'", "\""); 
return mystr; 
} 
//递归 
private string GetOtherJson(int pid) 
{ 
DataTable dt = DBUtility.db.ExecuteTable("select * from class where classid=" + pid); 
string strjson = ""; 
bool haschild = IsHasChild(pid); 
strjson = "{"; 
strjson += "'id':'" + pid + "',"; 
strjson += "'text':'" + dt.Rows[0]["classname"].ToString() + "',"; 
strjson += "'value':'" + dt.Rows[0]["classid"].ToString() + "',"; 
strjson += " 'showcheck':true,"; 
strjson += " 'complete':true,"; 
strjson += "'checktate':0,"; 
strjson += "'hasChildren':" + haschild.ToString().ToLower() + ","; 
strjson += "'ChildNodes':"; 
if (!IsHasChild(pid)) 
{ 
strjson += "null}"; 
} 
else 
{ 
strjson += "["; 
DataTable mydt = DBUtility.db.ExecuteTable("select * from class where parientid=" + pid); 
for (int i = 0; i <= mydt.Rows.Count - 1; i++) 
{ 
strjson += GetOtherJson(Convert.ToInt32(mydt.Rows[i]["classid"].ToString())) + ","; 
} 
strjson = strjson.Substring(0, strjson.Length - 1); 
strjson += "]}"; 
} 
return strjson; 
} 
private bool IsHasChild(int pid) 
{ 
DataTable dt = DBUtility.db.ExecuteTable("select * from class where parientid=" + pid); 
if (dt.Rows.Count == 0) 
{ 
return false; 
} 
else 
{ 
return true; 
} 
}