使用递归方法为TreeView添加数据

使用递归方法为TreeView添加数据

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
bindTree();
}
}

protected DataTable GetTreeData()
{
string sql = ConfigurationManager.ConnectionStrings["sql"].ConnectionString;
using (SqlConnection conn = new SqlConnection(sql))
{
SqlCommand comm = conn.CreateCommand();
comm.CommandText = "select * from MenuTree order by ParentID,MenuOrder";
SqlDataAdapter da = new SqlDataAdapter(comm);
DataSet ds = new DataSet();
da.Fill(ds);
return ds.Tables[0];
}
}
private void bindTree()
{
DataTable dt = GetTreeData();
this.fillNode(dt, null);
}
private void fillNode(DataTable dt, TreeNode node)
{
DataView dv = new DataView(dt);
if (node == null)
{
dv.RowFilter = "parentID='0'"; //为根节点的子节点
}
else
{
dv.RowFilter = "parentID='" + node.Value + "'";//对应节点的子节点
}
//遍历填充节点的所有子节点，如果传入的节点node为叶子节点，遍历要退出，不再进行递归
foreach (DataRowView drv in dv)
{
TreeNode no = new TreeNode(drv["MenuName"].ToString(), drv["MenuID"].ToString());
fillNode(dt, no); //填充no节点的子节点
if (node == null)
{
this.TreeView1.Nodes.Add(no);
}
Else
{
node.ChildNodes.Add(no);
}
}
}