treeview 的层次显示

treeview 的层次显示 [无满意答案结贴,结贴人:sssjjjpppsjp]

sssjjjpppsjp
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发表于：2008-05-22 17:21:13 楼主

加了个treeview，开始是显示两层的，后来想改为四层，但是改了以后还是只能显示两层，这是怎么回事，treeview最多支持几层？

代码发上来，希望各位高手帮我检查检查

ASPX页面：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="left.aspx.cs" Inherits="left" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页 </title>

</head>
<body bgcolor="#fbf2ea" style="font-size:12px;">
<form id="form1" runat="server">

<asp:TreeView ID="trvleft" runat="server" MaxDataBindDepth="4" OnSelectedNodeChanged="trvleft_SelectedNodeChanged"
OnTreeNodePopulate="trvleft_TreeNodePopulate" BackColor="#FBF2EA" ShowLines="True" NodeIndent="10">
<Nodes>
<asp:TreeNode PopulateOnDemand="True" Text="大鲵信息库" Value="大鲵信息库"> </asp:TreeNode>
</Nodes>
<NodeStyle BackColor="WhiteSmoke" BorderColor="WhiteSmoke" BorderStyle="Solid" BorderWidth="1px"
ChildNodesPadding="2px" />
<LeafNodeStyle NodeSpacing="2px" />
</asp:TreeView>

</form>
</body>
</html>

CS页面：

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

public partial class left : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}

void PopulateCategories(TreeNode node)
{
SqlCommand sqlQuery = new SqlCommand("Select className,classID From daniclass where bigclassID=@bigclassid");
sqlQuery.Parameters.Add("@bigclassid", SqlDbType.Int).Value =node.Value;

DataSet resultSet= RunQuery(sqlQuery);

if (resultSet.Tables.Count > 0)
{
foreach (DataRow row in resultSet.Tables[0].Rows)
{
TreeNode NewNode = new
TreeNode(" <a href='classcontent.aspx?classid="+row["classID"]+"' target='right'>" + row["className"]+" </a>".ToString(),
row["classID"].ToString());
NewNode.PopulateOnDemand = true;
NewNode.SelectAction = TreeNodeSelectAction.Expand;
node.ChildNodes.Add(NewNode);

}
}
}

void Populatedani(TreeNode node)
{
SqlCommand sqlQuery = new SqlCommand();
sqlQuery.CommandText = "Select daniID,name From dani Where classID=@categoryid";
sqlQuery.Parameters.Add("@categoryid", SqlDbType.Int).Value =
node.Value;
DataSet ResultSet = RunQuery(sqlQuery);

if (ResultSet.Tables.Count > 0)
{
foreach (DataRow row in ResultSet.Tables[0].Rows)
{

TreeNode NewNode = new
TreeNode(" <a href='content.aspx?msgid=" + row["daniID"] + "' target='right'>" + row["name"].ToString() + " </a>", row["daniID"].ToString());
NewNode.PopulateOnDemand = false;
NewNode.SelectAction = TreeNodeSelectAction.None;
node.ChildNodes.Add(NewNode);

}
}

}

void bigclassbind(TreeNode node)
{
SqlCommand sqlQuery = new SqlCommand();
sqlQuery.CommandText = "Select bigclassID,bigclassName From bigclass Where topclassID=@topclassid";
sqlQuery.Parameters.Add("@topclassid", SqlDbType.Int).Value =node.Value;
DataSet ResultSet = RunQuery(sqlQuery);

if (ResultSet.Tables.Count > 0)
{
foreach (DataRow row in ResultSet.Tables[0].Rows)
{

TreeNode NewNode = new
TreeNode(" <a href='mnueclass.aspx?dbname=bigclass&id=" + row["bigclassID"] + "' target='right'>" + row["bigclassName"].ToString() + " </a>", row["bigclassID"].ToString());
NewNode.PopulateOnDemand = true;
NewNode.SelectAction = TreeNodeSelectAction.Expand;
node.ChildNodes.Add(NewNode);

}
}

}

void topmnuebind(TreeNode node)
{
SqlCommand sqlQuery = new SqlCommand();
sqlQuery.CommandText = "Select topclassID,topclassName From topclass";
DataSet ResultSet = RunQuery(sqlQuery);

if (ResultSet.Tables.Count > 0)
{
foreach (DataRow row in ResultSet.Tables[0].Rows)
{

TreeNode NewNode = new
TreeNode(" <a href='mnueclass.aspx?dbname=topclass&id=" + row["topclassID"] + "' target='right'>" + row["topclassName"].ToString() + " </a>", row["topclassID"].ToString());
NewNode.PopulateOnDemand = true;
NewNode.SelectAction = TreeNodeSelectAction.Expand;
node.ChildNodes.Add(NewNode);

}
}

}

private DataSet RunQuery(SqlCommand sqlQuery)
{

SqlConnection DBConnection = all.createcon();

SqlDataAdapter dbAdapter = new SqlDataAdapter();
dbAdapter.SelectCommand = sqlQuery;
sqlQuery.Connection = DBConnection;
DataSet resultsDataSet = new DataSet();
try
{
dbAdapter.Fill(resultsDataSet);
}
catch
{
Response.Write("不能连接数据库。");
}
return resultsDataSet;
}

protected void trvleft_SelectedNodeChanged(object sender, EventArgs e)
{

}
protected void trvleft_TreeNodePopulate(object sender, TreeNodeEventArgs e)
{
if (e.Node.ChildNodes.Count == 0)
{
switch (e.Node.Depth)
{
case 0:
topmnuebind(e.Node);
break;
case 1:
bigclassbind(e.Node);
break;
case 2:
Populatedani(e.Node);
break;
case 3:
　PopulateCategories(e.Node);
break;
}
}

}
}

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