如何用asp.net实现无限级分类目录树，包括DropDownList、TreeView和ListBox？

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本示例介绍了如何使用ASP.NET实现DropDownList、TreeView和ListBox的无限极分类目录树。分享给广大开发者和爱好者，以下是一些建议和代码示例：

1. 使用Repeater控件展示无限极分类目录树： '> '> '> '> '>

2. 在Page_Load事件中绑定数据：csharpprotected void Page_Load(object sender, EventArgs e){ if (!IsPostBack) { BindTreeData(); }}

private void BindTreeData(){ // 假设你有一个包含分类数据的列表 List treeNodes=GetTreeNodes();

rptTree.DataSource=treeNodes; rptTree.DataBind();}

3. 定义TreeNode类：csharppublic class TreeNode{ public string Name { get; set; } public string Url { get; set; } public List Children { get; set; }}

4. 获取分类数据的方法（示例）：csharpprivate List GetTreeNodes(){ // 这里根据实际情况获取分类数据 List treeNodes=new List();

// 添加一级分类 treeNodes.Add(new TreeNode { Name=一级分类1, Url=/category1, Children=GetChildren() });

// 添加更多一级分类...

return treeNodes;}

private List GetChildren(){ // 这里根据实际情况获取二级分类 List children=new List();

// 添加二级分类 children.Add(new TreeNode { Name=二级分类1-1, Url=/category1-1, Children=GetGrandChildren() });

// 添加更多二级分类...

return children;}

private List GetGrandChildren(){ // 这里根据实际情况获取三级分类 List grandChildren=new List();

// 添加三级分类 grandChildren.Add(new TreeNode { Name=三级分类1-1-1, Url=/category1-1-1 });

// 添加更多三级分类...

return grandChildren;}

以上示例仅供参考，实际开发中请根据需求进行调整。希望对大家有所帮助！

本文实例讲述了asp.net实现DropDownList,TreeView,ListBox的无限极分类目录树。分享给大家供大家参考，具体如下：

#region DropDownList无限递归显示层次关系 /// <summary> /// 创建无限分级下拉列表框 /// </summary> /// <param name="ddlst">下拉控件</param> /// <param name="dt">源DataTable</param> /// <param name="text">text字段</param> /// <param name="value">value字段</param> /// <param name="parentid">深度字段 例如parentid</param> public static void CreateLevelDropDown(DropDownList ddlst, DataTable dt, string text, string value, string parentid) { ArrayList allItems = new ArrayList(); DataRow[] rows = dt.Select(parentid + "=0"); foreach (DataRow row in rows) CreateLevelDropDownAssistant(dt, ref allItems, row, string.Empty, text, value, parentid); ListItem[] items = new ListItem[allItems.Count]; allItems.CopyTo(items); ddlst.Items.AddRange(items); } /// <summary> /// 递归绑定子节点 /// </summary> /// <param name="dt">源DataTable</param> /// <param name="items">数组</param> /// <param name="parentRow">当前节点</param> /// <param name="curHeader">前缀</param> /// <param name="text">text字段</param> /// <param name="value">value字段</param> /// <param name="parentid">深度字段 例如parentid</param> private static void CreateLevelDropDownAssistant(DataTable dt, ref ArrayList items, DataRow parentRow, string curHeader, string text, string value, string parentid) { ListItem newItem = new ListItem(curHeader + Until.CutString(parentRow[text].ToString(), 18, true), parentRow[value].ToString()); items.Add(newItem); DataRow[] rows = dt.Select(parentid + "=" + newItem.Value); for (int i = 0; i < rows.Length - 1; i++) CreateLevelDropDownAssistant(dt, ref items, rows[i], curHeader.Replace("┣", "┃").Replace("┗", "┣") + "┣", text, value, parentid); if (rows.Length > 0) CreateLevelDropDownAssistant(dt, ref items, rows[rows.Length - 1], curHeader.Replace("┣", "┃").Replace("┗", "┣") + "┗", text, value, parentid); } #endregion #region TreeView 无限递归显示层次关系目录树 /// <summary> /// 创建无限分级目录树TreeView /// </summary> /// <param name="treeview">TreeView空间</param> /// <param name="dt">数据源DataTable</param> /// <param name="text">text字段</param> /// <param name="value">value字段</param> /// <param name="parentid">深度字段 例如parentid</param> public static void CreateLevelTreeView(TreeView treeview, DataTable dt, string text, string value, string parentid) { DataView dv = dt.DefaultView; dv.RowFilter = parentid + "=0"; foreach (DataRowView drv in dv) { TreeNode node = new TreeNode(); node.Text = drv[text].ToString(); node.Value = drv[value].ToString(); node.Expanded = false; treeview.Nodes.Add(node); CreatTreeViewChildNode(dv, node, text, value, parentid); } } /// <summary> /// 递归绑定子节点 /// </summary> /// <param name="dv">源DataView</param> /// <param name="parentNode">当前节点</param> /// <param name="text">text字段</param> /// <param name="value">value字段</param> /// <param name="parentid">深度字段 例如parentid</param> private static void CreatTreeViewChildNode(DataView dv, TreeNode parentNode, string text, string value, string parentid) { dv.RowFilter = parentid + "=" + parentNode.Value; foreach (DataRowView row in dv) { TreeNode replyNode = new TreeNode(); replyNode.Text = row[text].ToString(); replyNode.Value = row[value].ToString(); replyNode.Expanded = false; parentNode.ChildNodes.Add(replyNode); CreatTreeViewChildNode(dv, replyNode, text, value, parentid); } } /// <summary> /// 创建无限分级目录树TreeView /// </summary> /// <param name="treeview">TreeView空间</param> /// <param name="dt">数据源DataTable</param> /// <param name="text">text字段</param> /// <param name="value">value字段</param> /// <param name="url">url字段</param> /// <param name="parentid">深度字段 例如parentid</param> public static void CreateLevelTreeView(TreeView treeview, DataTable dt, string text, string value, string url, string parentid) { DataView dv = dt.DefaultView; dv.RowFilter = parentid + "=0"; foreach (DataRowView drv in dv) { TreeNode node = new TreeNode(); node.Text = drv[text].ToString(); node.Value = drv[value].ToString(); node.NavigateUrl = drv[url].ToString(); node.Expanded = false; treeview.Nodes.Add(node); CreatTreeViewChildNode(dv, node, text, value, url, parentid); } } /// <summary> /// 递归绑定子节点 /// </summary> /// <param name="dv">源DataView</param> /// <param name="parentNode">当前节点</param> /// <param name="text">text字段</param> /// <param name="value">value字段</param> /// <param name="url">url字段</param> /// <param name="parentid">深度字段 例如parentid</param> private static void CreatTreeViewChildNode(DataView dv, TreeNode parentNode, string text, string value, string url, string parentid) { dv.RowFilter = parentid + "=" + parentNode.Value; foreach (DataRowView row in dv) { TreeNode replyNode = new TreeNode(); replyNode.Text = row[text].ToString(); replyNode.Value = row[value].ToString(); replyNode.NavigateUrl = row[url].ToString(); replyNode.Expanded = false; parentNode.ChildNodes.Add(replyNode); CreatTreeViewChildNode(dv, replyNode, text, value, url, parentid); } } #endregion #region 创建无限分级ListBox /// <summary> /// 创建无限分级ListBox /// </summary> /// <param name="ddlst">ListBox控件</param> /// <param name="dt">源DataTable</param> /// <param name="text">text字段</param> /// <param name="value">value字段</param> /// <param name="parentid">深度字段 例如parentid</param> public static void CreateLevelListBox(ListBox ddlst, DataTable dt, string text, string value, string parentid) { ArrayList allItems = new ArrayList(); DataRow[] rows = dt.Select(parentid + "=0"); foreach (DataRow row in rows) CreateLevelListBoxAssistant(dt, ref allItems, row, string.Empty, text, value, parentid); ListItem[] items = new ListItem[allItems.Count]; allItems.CopyTo(items); ddlst.Items.AddRange(items); } /// <summary> /// 递归绑定子节点 /// </summary> /// <param name="dt">源DataTable</param> /// <param name="items">数组</param> /// <param name="parentRow">当前节点</param> /// <param name="curHeader">前缀</param> /// <param name="text">text字段</param> /// <param name="value">value字段</param> /// <param name="parentid">深度字段 例如parentid</param> private static void CreateLevelListBoxAssistant(DataTable dt, ref ArrayList items, DataRow parentRow, string curHeader, string text, string value, string parentid) { ListItem newItem = new ListItem(curHeader + Until.CutString(parentRow[text].ToString(), 18, true), parentRow[value].ToString()); items.Add(newItem); DataRow[] rows = dt.Select(parentid + "=" + newItem.Value); for (int i = 0; i < rows.Length - 1; i++) CreateLevelListBoxAssistant(dt, ref items, rows[i], curHeader.Replace("┣", "┃").Replace("┗", "┣") + "┣", text, value, parentid); if (rows.Length > 0) CreateLevelListBoxAssistant(dt, ref items, rows[rows.Length - 1], curHeader.Replace("┣", "┃").Replace("┗", "┣") + "┗", text, value, parentid); } #endregion

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