asp.net TreeView 的使用

protected void CreateNode()
{
DataTable d = new DataTable();
using (SqlConnection sql = new SqlConnection(ConnectionString))
{
SqlCommand sq = new SqlCommand("select [name] as 表名,[type] from [sysobjects]", sql);
SqlDataAdapter sda = new SqlDataAdapter();
sda.SelectCommand = sq;
sda.Fill(d);
}
DataRow[] dr = d.Select("[type] = 'u'", "表名");
if (dr.Length > 0)
{
foreach (DataRow drr in dr)
{
TreeNode tn = new TreeNode();
tn.Value = drr["表名"].ToString();
tn.Text = drr["表名"].ToString();
tn.Expanded = false;
tn.SelectAction = TreeNodeSelectAction.Expand;
TreeView1.Nodes.Add(tn);
CreateChild(tn, dts);
}
}
else
{
TreeNode t = new TreeNode();
t.Value = "空";
t.Text = "空";
t.Expanded = false;
t.SelectAction = TreeNodeSelectAction.Expand;
TreeView1.Nodes.Add(t);
}
}

protected void CreateChild(TreeNode tnn, DataTable dtt)
{
DataRow[] dr = dtt.Select("表名='" + tnn.Value + "'", "表名");
if (dr.Length > 0)
{
foreach (DataRow drw in dr)
{
TreeNode ts = new TreeNode();
ts.Value = drw["列名"].ToString();
ts.Text = drw["列名"].ToString() + "(" + drw["类型"].ToString() + "," + drw["长度"].ToString() + ")";
ts.SelectAction = TreeNodeSelectAction.Expand;
//ts.Expanded = false;
tnn.ChildNodes.Add(ts);
CreateChild(ts, dtt);
}
}
}

protected DataTable CreateTable()
{
DataTable d = new DataTable();
using (SqlConnection sql = new SqlConnection(ConnectionString))
{
SqlCommand sq = new SqlCommand("select a.[name] as 表名 ,b.name as 列名,type_name(b.system_type_id)as 类型,b.max_length as 长度 from [sysobjects] a ,sys.columns b where a.[type] = 'u' and object_id=object_id(a.[name])", sql);
SqlDataAdapter sda = new SqlDataAdapter();
sda.SelectCommand = sq;
sda.Fill(d);
}
return d;
}