treeview 控件动态绑定数据部分实例代码

一:

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treeview 源教程实例部分代码段

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protected void page_load(object o ,eventargs e )
{//首先填充第一级节点

    dataview dv=获取dataview视图函数;

foreach(datarowview datav in dv)
    {//循环数据视图,将对应的值交给一个节点对象,然后添加到树上有继续添加
     
      treenode tn=new TreeNode();
      tn.Text=datav("title").ToString();
      tn.Value=datav("bid").ToString();
      tn.Expanded=false;
      TreeView1.Nodes.Add(tn);

      AddchildNodes(tn);//调用方法填充二级节点
    }
}

 

private void AddchildNodes(TreeNode tn)
{//填充二级节点,他需要一级节点的value ,所以干脆送了一个完整的根节点对象
   int bid=Convert.ToInt32(tn.Value);
DataView dv=drv("select * from class where bid="+bid+");
foreach(DataRowView datav in dv)
    {//同上
     TreeNode ctn=new TreeNode();
     ctn.Text=datav["title"].ToString();
     ctn.Value=datav["cid"].ToString();
     ctn.NavigateUrl="http://thcjp.cnblogs.com/jiashe.aspx?aa="+datav["cid"].ToSring;
     tn.ChildNodes.Add(ctn);
     //把节点ctn加载到tn下面或者说添加为tn的子节点
    }

}


//下面这段代码的作用在于把选用节点的text值打印出来
protect void Button1_Click(object sender,Eventargs e)
{

 if(TreeView1.CheckedNodes.Count>0)
   {
     //如果有项被选中


       foreach(TreeNode tn in TreeView1.CheckedNodes)
          {//跌代所有被选中的节点
             
            if(tb.ChildNodes.Count>0)
              {//如果被选中项下面还有子节点
          
                 foreach(TreeNode ctn in tn.ChildNodes)
                    {//迭代所有子节点,把值读出来
                        Response.Write(ctn.Text+"<br>");
                    }     
              }


               else
                {
                  //如果下面没有节点了,说明是叶节点,那么直接读出被选取项的值
              
                   Response.Write(tn.Text+"<br>");
                }
          
          }
   }

}

 

 

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treeview 实例代码段(待续)

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page
{
    TreeNode tn = new TreeNode();
    protected void Page_Load(object sender, EventArgs e)
    {
        TreeView1.ShowLines = true;
        TreeView1.ToolTip = "a test";
        TreeView1.ShowExpandCollapse = true;
        TreeView1.ShowCheckBoxes = TreeNodeTypes.Leaf;

        if (!IsPostBack)
        {
                       
            tn.Text = "根结点";
            tn.Value = "rootnode";
            tn.Expanded = true;
            TreeView1.Nodes.Add(tn);
            addlevel2nodes(tn);
           

        }
        else
        {
            addlevel2nodes(tn);
        }  
   
    }

 

    protected void addlevel2nodes(TreeNode fathertn)
    {
        string conn = "Server=localhost;Database=bookshop;Uid=sa;Pwd=asen";
        Userinfo userinfo1 = new Userinfo(conn);
        DataView dv1 = userinfo1.selectalluserinfo();

        foreach (DataRowView dv in dv1)
        {
            TreeNode tn = new TreeNode();
            tn.Text = dv["username"].ToString();
            tn.Value = dv[3].ToString();
            tn.Expanded = true;
            fathertn.ChildNodes.Add(tn);          
           


        }
    }
   
}

 

方法 二

 

注意在设计数据库时,ID为自动增长,ROWID 是基于父节点ID的子节点

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using System.Data.SqlClient;

public partial class TreeView : System.Web.UI.Page
{
      protected void Page_Load(object sender, EventArgs e)
      {
          if (!IsPostBack)
          {
              InitTreeView();
              TreeView1.Target = "main"; //框架的NAME
          }
      }


      private void InitTreeView()
      {
          string strSqlSelete = "SELECT ID,NAME,URL,ROWID,PIC FROM TREE1";

          DataView dataview = GetTreeDataView(strSqlSelete);
          dataview.RowFilter = "ROWID=0";

          foreach (DataRowView AddDataView in dataview)
          {
              TreeNode node = new TreeNode();
            
              node.Text = AddDataView["NAME"].ToString();
              node.Value = AddDataView["ID"].ToString();
              node.NavigateUrl = AddDataView["URL"].ToString();
              node.ImageUrl = AddDataView["PIC"].ToString();
              node.ImageToolTip = "首页图象";
              TreeView1.Nodes.Add(node);

              AddChildNodes(node);
          }
      }

      private DataView GetTreeDataView(string strSQL)
      {
          ConnClass conn = new ConnClass();
          SqlConnection Conn = new SqlConnection(conn.GetStrConnction);
          SqlDataAdapter da = new SqlDataAdapter(strSQL, Conn);
          DataSet ds = new DataSet();
          da.Fill(ds, "TreeView");
         return ds.Tables["TreeView"].DefaultView;
      }

      private void AddChildNodes(TreeNode ChildNode)
      {
          int ROWID = Convert.ToInt32(ChildNode.Value);
          DataView dataview = GetTreeDataView("SELECT ID,NAME,URL,PIC FROM TREE1 WHERE ROWID=" + ROWID);
          foreach (DataRowView AddChilDataView in dataview)
          {
              TreeNode Node = new TreeNode();
              Node.Text = AddChilDataView["NAME"].ToString();
              Node.Value = AddChilDataView["ID"].ToString();
              Node.NavigateUrl = AddChilDataView["URL"].ToString();
              Node.ImageUrl = AddChilDataView["PIC"].ToString();
              Node.ImageToolTip = AddChilDataView["NAME"].ToString();
              Node.ToolTip=AddChilDataView["NAME"].ToString();
              ChildNode.ChildNodes.Add(Node);

              AddChildNodes(Node);
          }
      }
}

方法三

TreeView绑定省市的代码。

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protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {//首先填充第一级节点。
            DataView dv = GetDv("select * from prov");
            foreach(DataRowView datav in dv)
             {     //循环数据视图,将对应的数据交给一个节点对象,然后添加到树上继续填加         
            TreeNode tn = new TreeNode();
            tn.Text = datav["prov"].ToString();
            tn.Value = datav["provid"].ToString();
            tn.Expanded = false;
            TreeView1.Nodes.Add(tn);
            AddChildNode(tn);
            }
        }
    }

    private DataView GetDv(string sql)
    {//根据传来的sql语句返回一个DataView数据式图
        OleDbConnection conn = new OleDbConnection();
        conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="
        + Server.MapPath("~/") + @"//App_Data//data.mdb;Persist Security Info=True";
        conn.Open();
        OleDbDataAdapter da = new OleDbDataAdapter(sql, conn);
        DataSet ds = new DataSet();
        da.Fill(ds, "Tree");
        return ds.Tables["Tree"].DefaultView;
    }
    private void AddChildNode(TreeNode tn)
    {//填充二级节点,需要一级节点的Value,所以直接传了个TreeNode
        int provID = Convert.ToInt32(tn.Value);
        DataView dv = GetDv("select * from city where provid=" + provID + "");
        foreach (DataRowView datav in dv)
        {
            TreeNode Ctn = new TreeNode();
            Ctn.Text = datav["city"].ToString();
            Ctn.Value = datav["cityId"].ToString();
            Ctn.NavigateUrl = "Detail.aspx?id="+datav["cityid"].ToString()+"";
            Ctn.Target = "_blank";
            tn.ChildNodes.Add(Ctn);

        }

    }