TreeView绑定数据库 （非递归）

公司：id(int) company(varchar(50)

部门：id(int) deid(int) department(varchar(50))

班组：id(int) coid(int) class(varchar(50))

非递归实现

string strConn
= System.Configuration.ConfigurationManager.ConnectionStrings["rizhi"].ConnectionString;

protected
void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

DataSet ds =
new DataSet();

SqlConnection conn =
new SqlConnection(strConn);

using (conn)

{

SqlDataAdapter sda_Company =
new SqlDataAdapter("select [id],[company] from [company]",
conn);

sda_Company.Fill(ds, "company");

TreeNode tn_Company;

TreeNode tn_Department;

TreeNode tn_Class;

foreach (DataRow company_row
in ds.Tables["company"].Rows)

{

tn_Company =
new TreeNode();

tn_Company.Text = company_row["company"].ToString();

tn_Company.Value = company_row["id"].ToString();

TreeView1.Nodes.Add(tn_Company);

SqlDataAdapter sda_Department =
new SqlDataAdapter("select [id],[department] from [department] where coid="
+ tn_Company.Value, conn);

sda_Department.Fill(ds, "department");

if (ds.Tables["department"].Rows.Count
> 0)

{

foreach (DataRow department_row
in ds.Tables["department"].Rows)

{

tn_Department =
new TreeNode();

tn_Department.Text = department_row["department"].ToString();

tn_Department.Value = department_row["id"].ToString();

tn_Company.ChildNodes.Add(tn_Department);

SqlDataAdapter sda_Class =
new SqlDataAdapter("select [id],[class] from [class] where deid="
+ tn_Department.Value, conn);

sda_Class.Fill(ds, "class");

if (ds.Tables["class"].Rows.Count
> 0)

{

foreach (DataRow class_row
in ds.Tables["class"].Rows)

{

tn_Class =
new TreeNode();

tn_Class.Text = class_row["class"].ToString();

tn_Class.Value = class_row["id"].ToString();

tn_Department.ChildNodes.Add(tn_Class);

}

ds.Tables["class"].Clear();

}

sda_Class.Dispose();

}

ds.Tables["department"].Clear();

}

sda_Department.Dispose();

}

sda_Company.Dispose();

}

}

}