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            1、递归函数 //  '递归遍历自建目录树＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝   private void ShowDir(string sZml,string sIndex)   {    System.Data.SqlClient.SqlConnection sqlCon=new System.Data.SqlClient.SqlConnection(connectionString);    string sqlStr="select * from mltable where mlzml=N'"+ sZml +"'";    System.Data.SqlClient.SqlDataAdapter sqlAda=new System.Data.SqlClient.SqlDataAdapter(sqlStr,sqlCon);    System.Data.DataTable Dt=new DataTable();    sqlAda.Fill(Dt);    Microsoft.Web.UI.WebControls.TreeNode Node1;    string sIndex0;    string sIndex2;    int theId;    int sIndex1=0;//记录树的最后一位值    foreach(System.Data.DataRow DtDataRow in Dt.Rows)    {     theId=Convert.ToInt32(DtDataRow["mlid"]);     Node1=new Microsoft.Web.UI.WebControls.TreeNode();     Node1.Text=DtDataRow["mlmc"].ToString();     Node1.ImageUrl="images/trees/folder.gif";     Node1.ExpandedImageUrl="images/trees/folderopen.gif";     Node1.Expanded=false;     Node1.NavigateUrl="Admin_Tree_Show.aspx?theid=" + theId +"&sIndex="+ sIndex+"."+sIndex1.ToString();     Node1.ID="";     Node1.Target="main";     if(sIndex=="")     {      sIndex2=TreeView1.Nodes.IndexOf(Node1).ToString();      sIndex0=sIndex2;     }     else     {      Microsoft.Web.UI.WebControls.TreeNode pNode=TreeView1.GetNodeFromIndex(sIndex);      pNode.Nodes.Add(Node1);      sIndex2=pNode.Nodes.IndexOf(Node1).ToString();      sIndex0=sIndex + "." + sIndex2;      sIndex1++;//记录当前树下叶子的个数，即当前叶子的号     }     ShowDir(DtDataRow["mlid"].ToString(),sIndex0);        }    sqlCon.Close();   } 

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