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

///

/// 创建无限分级下拉列表框

///

/// 下拉控件

/// 源DataTable

/// text字段

/// value字段

/// 深度字段 例如parentid

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);

}

///

/// 递归绑定子节点

///

/// 源DataTable

/// 数组

/// 当前节点

/// 前缀

/// text字段

/// value字段

/// 深度字段 例如parentid

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

///

/// 创建无限分级目录树TreeView

///

/// TreeView空间

/// 数据源DataTable

/// text字段

/// value字段

/// 深度字段 例如parentid

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);

}

}

///

/// 递归绑定子节点

///

/// 源DataView

/// 当前节点

/// text字段

/// value字段

/// 深度字段 例如parentid

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);

}

}

///

/// 创建无限分级目录树TreeView

///

/// TreeView空间

/// 数据源DataTable

/// text字段

/// value字段

/// url字段

/// 深度字段 例如parentid

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);

}

}

///

/// 递归绑定子节点

///

/// 源DataView

/// 当前节点

/// text字段

/// value字段

/// url字段

/// 深度字段 例如parentid

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

///

/// 创建无限分级ListBox

///

/// ListBox控件

/// 源DataTable

/// text字段

/// value字段

/// 深度字段 例如parentid

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);

}

///

/// 递归绑定子节点

///

/// 源DataTable

/// 数组

/// 当前节点

/// 前缀

/// text字段

/// value字段

/// 深度字段 例如parentid

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

希望本文所述对大家asp.net程序设计有所帮助。