ASP.NET递归添加树节点

表设计如图:

id        title         parentid

1         asp.net   0

2         c#           0

3         c#_0       2

4         c#_1       3

5         c#_2       4

页面中添加一个TreeView控件

写添加节点方法:

private void AddNode(int id, TreeNode parentnode)

{

string sql = "select * from menu";//sql 语句

DataTable table = DB.GetDB(sql);//获取数据

DataView view = new DataView(table);//把表数据添加到自定义视图中

view.RowFilter = "parentid="+id;//设置视图查询条件

foreach (DataRowView row in view)//遍历视图中数据

　　 {              TreeNode node = new TreeNode();

　　　　 node.Text = row[1].ToString();

int newid = Convert.ToInt32(row[0]);

if (parentnode != null)            
                    {

node.Expanded = false;

parentnode.ChildNodes.Add(node);

AddNode(newid, node);//递归查找节点

}

else

{

TreeView1.Nodes.Add(node);

AddNode(newid, node);

}

}

}

DB类中GetDB()方法:

public static SqlConnection sqlconn()

{         string sqlconnstr = "database=menutree;data source=.;uid=sa;pwd=123";

SqlConnection conn = new SqlConnection(sqlconnstr);         return conn;     }

public static DataTable GetDB(string sql)

{         SqlConnection connection = sqlconn();

SqlCommand comm = new SqlCommand(sql, connection);

SqlDataAdapter ad = new SqlDataAdapter(comm);

DataTable table = new DataTable();

ad.Fill(table);

return table;     }

调用代码:

protected void Page_Load(object sender, EventArgs e)

{                if (!IsPostBack)

{             TreeView1.Nodes.Clear();

AddNode(0, (TreeNode)null);        
}     }

完成!