asp.net实现DropDownList,TreeView,ListBox的无限极分类目录树

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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