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：
#regionDropDownList无限递归显示层次关系
///<summary>
///创建无限分级下拉列表框
///</summary>
///<paramname="ddlst">下拉控件</param>
///<paramname="dt">源DataTable</param>
///<paramname="text">text字段</param>
///<paramname="value">value字段</param>
///<paramname="parentid">深度字段例如parentid</param>
publicstaticvoidCreateLevelDropDown(DropDownListddlst,DataTabledt,stringtext,stringvalue,stringparentid)
{
ArrayListallItems=newArrayList();
DataRow[]rows=dt.Select(parentid+"=0");
foreach(DataRowrowinrows)
CreateLevelDropDownAssistant(dt,refallItems,row,string.Empty,text,value,parentid);
ListItem[]items=newListItem[allItems.Count];
allItems.CopyTo(items);
ddlst.Items.AddRange(items);
}
///<summary>
///递归绑定子节点
///</summary>
///<paramname="dt">源DataTable</param>
///<paramname="items">数组</param>
///<paramname="parentRow">当前节点</param>
///<paramname="curHeader">前缀</param>
///<paramname="text">text字段</param>
///<paramname="value">value字段</param>
///<paramname="parentid">深度字段例如parentid</param>
privatestaticvoidCreateLevelDropDownAssistant(DataTabledt,refArrayListitems,DataRowparentRow,stringcurHeader,stringtext,stringvalue,stringparentid)
{
ListItemnewItem=newListItem(curHeader+Until.CutString(parentRow[text].ToString(),18,true),parentRow[value].ToString());
items.Add(newItem);
DataRow[]rows=dt.Select(parentid+"="+newItem.Value);
for(inti=0;i<rows.Length-1;i++)
CreateLevelDropDownAssistant(dt,refitems,rows[i],curHeader.Replace("┣","┃").Replace("┗","┣")+"┣",text,value,parentid);
if(rows.Length>0)
CreateLevelDropDownAssistant(dt,refitems,rows[rows.Length-1],curHeader.Replace("┣","┃").Replace("┗","┣")+"┗",text,value,parentid);
}
#endregion
#regionTreeView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>
///<paramname="treeview">TreeView空间</param>
///<paramname="dt">数据源DataTable</param>
///<paramname="text">text字段</param>
///<paramname="value">value字段</param>
///<paramname="parentid">深度字段例如parentid</param>
publicstaticvoidCreateLevelTreeView(TreeViewtreeview,DataTabledt,stringtext,stringvalue,stringparentid)
{
DataViewdv=dt.DefaultView;
dv.RowFilter=parentid+"=0";
foreach(DataRowViewdrvindv)
{
TreeNodenode=newTreeNode();
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>
///<paramname="dv">源DataView</param>
///<paramname="parentNode">当前节点</param>
///<paramname="text">text字段</param>
///<paramname="value">value字段</param>
///<paramname="parentid">深度字段例如parentid</param>
privatestaticvoidCreatTreeViewChildNode(DataViewdv,TreeNodeparentNode,stringtext,stringvalue,stringparentid)
{
dv.RowFilter=parentid+"="+parentNode.Value;
foreach(DataRowViewrowindv)
{
TreeNodereplyNode=newTreeNode();
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>
///<paramname="treeview">TreeView空间</param>
///<paramname="dt">数据源DataTable</param>
///<paramname="text">text字段</param>
///<paramname="value">value字段</param>
///<paramname="url">url字段</param>
///<paramname="parentid">深度字段例如parentid</param>
publicstaticvoidCreateLevelTreeView(TreeViewtreeview,DataTabledt,stringtext,stringvalue,stringurl,stringparentid)
{
DataViewdv=dt.DefaultView;
dv.RowFilter=parentid+"=0";
foreach(DataRowViewdrvindv)
{
TreeNodenode=newTreeNode();
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>
///<paramname="dv">源DataView</param>
///<paramname="parentNode">当前节点</param>
///<paramname="text">text字段</param>
///<paramname="value">value字段</param>
///<paramname="url">url字段</param>
///<paramname="parentid">深度字段例如parentid</param>
privatestaticvoidCreatTreeViewChildNode(DataViewdv,TreeNodeparentNode,stringtext,stringvalue,stringurl,stringparentid)
{
dv.RowFilter=parentid+"="+parentNode.Value;
foreach(DataRowViewrowindv)
{
TreeNodereplyNode=newTreeNode();
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>
///<paramname="ddlst">ListBox控件</param>
///<paramname="dt">源DataTable</param>
///<paramname="text">text字段</param>
///<paramname="value">value字段</param>
///<paramname="parentid">深度字段例如parentid</param>
publicstaticvoidCreateLevelListBox(ListBoxddlst,DataTabledt,stringtext,stringvalue,stringparentid)
{
ArrayListallItems=newArrayList();
DataRow[]rows=dt.Select(parentid+"=0");
foreach(DataRowrowinrows)
CreateLevelListBoxAssistant(dt,refallItems,row,string.Empty,text,value,parentid);
ListItem[]items=newListItem[allItems.Count];
allItems.CopyTo(items);
ddlst.Items.AddRange(items);
}
///<summary>
///递归绑定子节点
///</summary>
///<paramname="dt">源DataTable</param>
///<paramname="items">数组</param>
///<paramname="parentRow">当前节点</param>
///<paramname="curHeader">前缀</param>
///<paramname="text">text字段</param>
///<paramname="value">value字段</param>
///<paramname="parentid">深度字段例如parentid</param>
privatestaticvoidCreateLevelListBoxAssistant(DataTabledt,refArrayListitems,DataRowparentRow,stringcurHeader,stringtext,stringvalue,stringparentid)
{
ListItemnewItem=newListItem(curHeader+Until.CutString(parentRow[text].ToString(),18,true),parentRow[value].ToString());
items.Add(newItem);
DataRow[]rows=dt.Select(parentid+"="+newItem.Value);
for(inti=0;i<rows.Length-1;i++)
CreateLevelListBoxAssistant(dt,refitems,rows[i],curHeader.Replace("┣","┃").Replace("┗","┣")+"┣",text,value,parentid);
if(rows.Length>0)
CreateLevelListBoxAssistant(dt,refitems,rows[rows.Length-1],curHeader.Replace("┣","┃").Replace("┗","┣")+"┗",text,value,parentid);
}
#endregion
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