转：打造DropDownList,TreeView,ListBox无限极分类目录树

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#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  

原文地址：http://blog.csdn.net/smartsmile2012/article/details/7998590