TreeView加载数据库数据的三种方法实现三级联动

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<span style="font-size:18px;">方法一：.将所有节点加载到目录树上：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data;

using System.Data.SqlClient;

using System.Configuration;

public partial class TreeView将所有节点加载到目录树上 : System.Web.UI.Page

{

string sqlstr=ConfigurationManager.ConnectionStrings["sqlstr"].ConnectionString;

protected void Page_Load(object sender, EventArgs e)

{

GetData();

if (!IsPostBack)

{

LoadTreeview(this.TreeView1,null,0);

}

}

DataTable dt;

private void GetData()

{

using (SqlConnection sqlcnn=new SqlConnection(sqlstr))

{

using (SqlCommand sqlcmm=sqlcnn.CreateCommand())

{

sqlcmm.CommandText = "select * from T_Xzqh";

sqlcnn.Open();

dt = new DataTable();

SqlDataAdapter adapt = new SqlDataAdapter(sqlcmm);

adapt.Fill(dt);

sqlcmm.Dispose();

sqlcnn.Dispose();

}

}

}

private void LoadTreeview(TreeView tv, TreeNode tn, int ParentBh)

{

DataRow[] rows = dt.Select("ParentBh=" + ParentBh);

foreach (DataRow row in rows)

{

TreeNode node = new TreeNode();

node.Text = Convert.ToString(row["XzName"]);

node.Value = Convert.ToString(row["Xzbh"]);

if (tn == null)

{

tv.Nodes.Add(node);

}

else

{

tn.ChildNodes.Add(node);

}

LoadTreeview(this.TreeView1, node, Convert.ToInt32(row["Xzbh"]));

}

}

}

方法二：动态填充节点：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data;

using System.Data.SqlClient;

using System.Configuration;

public partial class TreeView动态填充节点 : System.Web.UI.Page

{

string sqlstr=ConfigurationManager.ConnectionStrings["sqlstr"].ConnectionString;

protected void Page_Load(object sender, EventArgs e)

{ GetData();

if (!IsPostBack)

{

LoadTreeView();

}

}

DataTable dt;

private void GetData()

{

using (SqlConnection sqlcnn=new SqlConnection(sqlstr))

{

using (SqlCommand sqlcmm=sqlcnn.CreateCommand())

{

sqlcmm.CommandText = "select * from T_Xzqh";

SqlDataAdapter adapter = new SqlDataAdapter(sqlcmm);

dt = new DataTable();

adapter.Fill(dt);

sqlcmm.Dispose();

sqlcnn.Dispose();

}

}

}

//获取顶级节点

private void LoadTreeView()

{

DataRow[] rows = dt.Select("parentbh="+0);

foreach (DataRow row in rows)

{

TreeNode node = new TreeNode();

node.Text = Convert.ToString(row["XzName"]);

node.Value = Convert.ToString(row["Xzbh"]);

node.PopulateOnDemand = true;

this.TreeView1.Nodes.Add(node);

}

}

protected void TreeView1_TreeNodePopulate(object sender, TreeNodeEventArgs e)

{

DataRow[] rows = dt.Select("parentbh="+e.Node.Value);

foreach (DataRow row in rows)

{

TreeNode node = new TreeNode();

node.Text = Convert.ToString(row["xzname"]);

node.Value = Convert.ToString(row["Xzbh"]);

//判断此节点下面是否有子节点，如果有就在前面显示加号(也就是设置此节点为动态填充)，否则不予操作

DataRow[] rows1 = dt.Select("ParentBh=" + Convert.ToString(row["Xzbh"]));

if (rows1.Length>0)

{

node.PopulateOnDemand = true;

}

e.Node.ChildNodes.Add(node);

}

}

}

方法三：动态从数据库中获取需要的数据，动态填充节点

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data;

using System.Data.SqlClient;

using System.Configuration;

public partial class TreeView动态从数据库中获取需要的数据_动态填充节点 : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

DataTable dt = GetDataTable(0);

foreach (DataRow row in dt.Rows)

{

TreeNode node = new TreeNode();

node.Text = Convert.ToString(row["XzName"]);

node.Value = Convert.ToString(row["Xzbh"]);

node.PopulateOnDemand = true;

this.TreeView1.Nodes.Add(node);

}

}

}

string sqlstr=ConfigurationManager.ConnectionStrings["sqlstr"].ConnectionString;

private DataTable GetDataTable(int parentbh)

{

using (SqlConnection sqlcnn=new SqlConnection(sqlstr))

{

using (SqlCommand sqlcmm=sqlcnn.CreateCommand())

{

sqlcmm.CommandText = "select * from T_Xzqh where parentbh="+parentbh;

SqlDataAdapter adapter = new SqlDataAdapter(sqlcmm);

DataTable dt = new DataTable();

adapter.Fill(dt);

sqlcmm.Dispose();

sqlcnn.Dispose();

return dt;

}

}

}

protected void TreeView1_TreeNodePopulate(object sender, TreeNodeEventArgs e)

{

List list = new List();

DataTable dt = GetDataTable(Convert.ToInt32(e.Node.Value));

foreach (DataRow row in dt.Rows)

{

TreeNode node = new TreeNode();

node.Text = Convert.ToString(row["XzName"]);

node.Value = Convert.ToString(row["Xzbh"]);

DataTable dt1 = GetDataTable(Convert.ToInt32(row["Xzbh"]));

if (dt1.Rows.Count>0)

{

node.PopulateOnDemand = true;

}

e.Node.ChildNodes.Add(node);

}

}

}</span>