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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(), , true), parentRow[value].ToString());

    items.Add(newItem);

    DataRow[] rows = dt.Select(parentid + "=" + newItem.Value);

    for (int i = ; i < rows.Length - ; i++)

        CreateLevelDropDownAssistant(dt, ref   items, rows[i], curHeader.Replace("┣", "┃").Replace("┗", "┣") + "┣", text, value, parentid);  

    if (rows.Length > )

        CreateLevelDropDownAssistant(dt, ref   items, rows[rows.Length - ], 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(), , true), parentRow[value].ToString());

    items.Add(newItem);

    DataRow[] rows = dt.Select(parentid + "=" + newItem.Value);

    for (int i = ; i < rows.Length - ; i++)

        CreateLevelListBoxAssistant(dt, ref   items, rows[i], curHeader.Replace("┣", "┃").Replace("┗", "┣") + "┣", text, value, parentid);  

    if (rows.Length > )

        CreateLevelListBoxAssistant(dt, ref   items, rows[rows.Length - ], curHeader.Replace("┣", "┃").Replace("┗", "┣") + "┗", text, value, parentid);

}

#endregion