本文實(shí)例講述了asp.net實(shí)現(xiàn)DropDownList,TreeView,ListBox的無限極分類目錄樹。分享給大家供大家參考,具體如下:
#region DropDownList無限遞歸顯示層次關(guān)系
/// summary>
/// 創(chuàng)建無限分級(jí)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>
/// 遞歸綁定子節(jié)點(diǎn)
/// /summary>
/// param name="dt">源DataTable/param>
/// param name="items">數(shù)組/param>
/// param name="parentRow">當(dāng)前節(jié)點(diǎn)/param>
/// param name="curHeader">前綴/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 無限遞歸顯示層次關(guān)系目錄樹
/// summary>
/// 創(chuàng)建無限分級(jí)目錄樹TreeView
/// /summary>
/// param name="treeview">TreeView空間/param>
/// param name="dt">數(shù)據(jù)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>
/// 遞歸綁定子節(jié)點(diǎn)
/// /summary>
/// param name="dv">源DataView/param>
/// param name="parentNode">當(dāng)前節(jié)點(diǎn)/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>
/// 創(chuàng)建無限分級(jí)目錄樹TreeView
/// /summary>
/// param name="treeview">TreeView空間/param>
/// param name="dt">數(shù)據(jù)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>
/// 遞歸綁定子節(jié)點(diǎn)
/// /summary>
/// param name="dv">源DataView/param>
/// param name="parentNode">當(dāng)前節(jié)點(diǎn)/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 創(chuàng)建無限分級(jí)ListBox
/// summary>
/// 創(chuàng)建無限分級(jí)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>
/// 遞歸綁定子節(jié)點(diǎn)
/// /summary>
/// param name="dt">源DataTable/param>
/// param name="items">數(shù)組/param>
/// param name="parentRow">當(dāng)前節(jié)點(diǎn)/param>
/// param name="curHeader">前綴/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
更多關(guān)于asp.net相關(guān)內(nèi)容感興趣的讀者可查看本站專題:《asp.net操作json技巧總結(jié)》、《asp.net字符串操作技巧匯總》、《asp.net操作XML技巧總結(jié)》、《asp.net文件操作技巧匯總》、《asp.net ajax技巧總結(jié)專題》及《asp.net緩存操作技巧總結(jié)》。