Implementation of C TreeView Infinite Directory Tree

This paper describes the implementation method of C # TreeView infinite directory tree with examples. Share it for your reference, as follows:

#region  Bind client tree 
protected void bindTreeView()
{
  TreeView1.Nodes.Clear();
  string userid = Session["UserID"].ToString();
  string sqlwr = new SY_ADMINUSER().GetUserIDListByLoginUser(userid, "CUSTOMERSERVICE", false);
  DataTable dt = Maticsoft.DBUtility.DbHelperOra.Query("Select PARENTID,CUSTOMERID,CUSTOMERSHORT,CUSTOMERSERVICE from CU_CUSTOMER where ISDELETE='0' " + sqlwr + " order by CUSTOMERSHORT ").Tables[0];
  // Define temporary tree nodes 
  TreeNode tmpNd;
  // Special treatment 
  foreach (DataRow dr in dt.Rows)
  {
    DataRow[] drs = dt.Select("CUSTOMERID='" + dr["PARENTID"] + "'");
    if (drs.Length == 0) // No superior node 
    {
      dr["PARENTID"] = "0";
    }
  }
  dt.AcceptChanges();
  // From DataTable All parent nodes are obtained in null Adj. DataRow Formed array 
  DataRow[] rows = dt.Select("PARENTID='0'");
  // Traversing the root node array 
  foreach (DataRow row in rows)
  {
    tmpNd = new TreeNode();
    // Assign a value to the root node 
    tmpNd.Value = row["CUSTOMERID"].ToString();
    tmpNd.Text = row["CUSTOMERSHORT"].ToString();
    tmpNd.Expanded = true;
    // Add nodes to the tree 
    TreeView1.Nodes.Add(tmpNd);
    AddTree(dt, TreeView1, tmpNd, row["CUSTOMERID"].ToString());
  }
}
public void AddTree(DataTable dt, TreeView tv, TreeNode pNode, string CUSTOMERID)
{
  DataRow[] rows = dt.Select("PARENTID='" + CUSTOMERID + "'");
  TreeNode tmpNd;
  foreach (DataRow row in rows)
  {
    tmpNd = new TreeNode();
    // Assign a value to the root node 
    tmpNd.Value = row["CUSTOMERID"].ToString();
    tmpNd.Text = row["CUSTOMERSHORT"].ToString();
    tmpNd.Expanded = true;
    pNode.ChildNodes.Add(tmpNd);
    // Add nodes to the tree 
    //TreeView1.Nodes.Add(pNode);
    AddTree(dt, TreeView1, tmpNd, row["CUSTOMERID"].ToString());
  }
}
#endregion

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