方法一：

View Code 本文轉載：http://dengzebo.blog.163.com/blog/static/18867406201032141742168/


#region?"讀取樹結點從Datatable"

????????///?<summary>

????????///?讀取樹結點從Datatable"

????????///?</summary>

????????///?<param?name="TreeView1">在填充的TreeView控件</param>

????????///?<param?name="DT">數(shù)據(jù)源DataTable</param>

????????///?<param?name="IsAppendNode">是在現(xiàn)有TreeView控件上添加結點，還是清空再添加</param>

????????///?<param?name="ParentNumberColumnIndex">在DataTable中，代表父節(jié)點編號的列索引</param>

????????///?<param?name="NumberColumnIndex">在DataTable中，代表當前節(jié)點編號的列索引</param>

????????///?<param?name="NameColumnIndex">在DataTable中，代表當前節(jié)點名稱的列索引</param>

????????///?<returns>True/False</returns>

????????public?bool?ReadNodesFromDataTable(TreeView?TreeView1,?DataTable?DT,?bool?IsAppendNode,?int?ParentNumberColumnIndex,?int?NumberColumnIndex,?int?NameColumnIndex)

????????{

????????????try

????????????{

????????????????if?(IsAppendNode?==?false)

????????????????{

????????????????????TreeView1.Nodes.Clear();

????????????????}

????????????????if?(DT?!=?null?&&?DT.Rows.Count?>?0)

????????????????{

????????????????????DataRow[]?DR?=?null;

????????????????????DR?=?DT.Select(DT.Columns[ParentNumberColumnIndex].ColumnName?+?"=''?or?"?+?DT.Columns[ParentNumberColumnIndex].ColumnName?+?"='0'?or?"?+?DT.Columns[ParentNumberColumnIndex].ColumnName?+?"?is?null");//先將頂級的查出來
????????????????????for?(int?I?=?0;?I?<=?DR.Length?-?1;?I++)//先將頂級的加入到TreeView中
????????????????????{

????????????????????????TreeNode?TNode?=?new?TreeNode(DR[I][DT.Columns[NameColumnIndex].ColumnName].ToString());

????????????????????????TNode.Tag?=?DR[I][DT.Columns[NumberColumnIndex].ColumnName].ToString();

????????????????????????TNode.Name?=?DR[I][DT.Columns[NameColumnIndex].ColumnName].ToString();

????????????????????????TreeView1.Nodes.Add(TNode);

????????????????????}

????????????????????for?(int?I?=?0;?I?<=?TreeView1.Nodes.Count?-?1;?I++)//再遞歸遍歷結點
????????????????????{

????????????????????????ForTreeNodeFormDT(TreeView1.Nodes[I],?DT,?ParentNumberColumnIndex,?NumberColumnIndex,?NameColumnIndex);

????????????????????}

????????????????}

????????????????return?false;

????????????}

????????????catch

????????????{

????????????????return?true;

????????????}

????????}

?

????????///?<summary>

????????///?從DT中遞歸遍歷出結點
????????///?</summary>

????????///?<param?name="TempNode">傳入的頂級結點</param>

????????///?<param?name="DT">保存TreeView結構的DataTable</param>

????????///?<param?name="ParentNumberColumnIndex">在DataTable中，代表父節(jié)點編號的列索引</param>

????????///?<param?name="NumberColumnIndex">在DataTable中，代表當前節(jié)點編號的列索引</param>

????????///?<param?name="NameColumnIndex">在DataTable中，代表當前節(jié)點名稱的列索引</param>

????????private?void?ForTreeNodeFormDT(TreeNode?TempNode,?DataTable?DT,?int?ParentNumberColumnIndex,?int?NumberColumnIndex,?int?NameColumnIndex)

????????{

????????????string?TTag?=?null;

????????????TTag?=?TempNode.Tag.ToString();

????????????DataRow[]?DR?=?null;

????????????DR?=?DT.Select(DT.Columns[ParentNumberColumnIndex].ColumnName?+?"='"?+?TTag?+?"'");

?

????????????for?(int?I?=?0;?I?<=?DR.Length?-?1;?I++)

????????????{

????????????????TreeNode?TNode?=?new?TreeNode(DR[I][DT.Columns[NameColumnIndex].ColumnName].ToString());

????????????????TNode.Tag?=?DR[I][DT.Columns[NumberColumnIndex].ColumnName].ToString();

????????????????TNode.Name?=?DR[I][DT.Columns[NameColumnIndex].ColumnName].ToString();

????????????????TempNode.Nodes.Add(TNode);

????????????}

?

????????????foreach?(TreeNode?aNode?in?TempNode.Nodes)

????????????{

????????????????ForTreeNodeFormDT(aNode,?DT,?ParentNumberColumnIndex,?NumberColumnIndex,?NameColumnIndex);

????????????}

????????}

????????#endregion

?

?

方法二：

?

做分類 經(jīng)常會用到無限級別的分類? 先介紹一下數(shù)據(jù)庫的表結構

tid? 類別編號

tname 類別名稱

pid 父類編號

測試數(shù)據(jù)就不寫了，大家可以自己插入一下試試

查詢制定類別的 所有的子類?? sql 的 代碼

with as 遞歸查詢 alter proc proc_chaxun (@tid int ) as begin with tt as (select tid,tname,pid from dbo.t_goodsType where tid=@tidunion allselect t.tid,t.tname,t.pid from dbo.t_goodsType t inner join tton t.pid=tt.tid)select * from tt end

查詢之后獲取記錄集?? 綁定到前臺的 TreeView 上面

遞歸進行添加 /// <summary>/// 給Tree 綁定數(shù)據(jù) 遞歸添加子節(jié)點/// </summary>/// <param name="dv">數(shù)據(jù)視圖</param>/// <param name="tnOld">添加數(shù)據(jù)的節(jié)點</param>public void TreeDataBind(DataView dv,TreeNode tnOld){TreeNode tnNew; //創(chuàng)建一個新的節(jié)點foreach (DataRowView drv in dv){//為新的借點設置屬性 tnNew = tnOld.Nodes.Add(drv["tname"].ToString());tnNew.Tag = drv["tid"];//過濾數(shù)據(jù)視圖 父類id = 上一級的tiddv.RowFilter = "pid=" + drv["tid"].ToString();//自己調用自己 TreeDataBind(dv, tnNew);}}

調用的方法很簡單

調用 DataTable dtRet = (DataTable)dh.ExecProcRetObj(ep); DataView dv = new DataView(dtRet);dv.RowFilter = "pid=0"; TreeDataBind(dv, this.treeView1.Nodes.Add("商品類別"));

效果

?

[知識分享] LINQ TO SQL 實現(xiàn)無限遞歸查詢

本文轉載：http://blog.csdn.net/q107770540/article/details/7708418

List<DetptInfo> lstDept = new List<DetptInfo> { new DetptInfo {ID=1,DeptName="公司",ParentID=0}, new DetptInfo {ID=10,DeptName="軟件中心",ParentID=1}, new DetptInfo {ID=11,DeptName="綜合辦公室",ParentID=1}, new DetptInfo {ID=100,DeptName="人力資源部",ParentID=11}, new DetptInfo {ID=101,DeptName="行政部",ParentID=11}, };public static List<DetptInfo> GetSonID(List<DetptInfo> lstDept, int p_id) { var query = from c in lstDept where c.ParentID == p_id select c;return query.Concat(query.SelectMany(t => GetSonID(lstDept, t.ID))).ToList(); }--調用：var query = GetSonID(lstDept, 0); Console.WriteLine("Id\tName\tParent");query.ToList().ForEach(q => Console.WriteLine("{0}\t{1}\t{2}", q.ID, q.DeptName, q.ParentID));

　　

總結

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