树的操作（绑定数据库，添加新节点，删除节点）(转载加实现)

前台：

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="Master_MasterPage" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title></title>
    <link href="../App_Themes/myTheme/Basic.css" rel="stylesheet" type="text/css" />
</head>
<body style="margin:0">
    <form id="form1" runat="server">
    <div>
    <table style="width:100%;height:100%;border-collapse:collapse;border-color:#44a938" border="1""">
    <tr><td style="height:50px; font-size:15px" colspan="2" align="center">God is a girl!</td></tr>

            <tr>
                <td style="width: 160px" valign="top">
                 <asp:TreeView ID="TreeLeft" runat="server" ShowLines="True" OnSelectedNodeChanged="TreeLeft_SelectedNodeChanged" >
                    </asp:TreeView>
                    Parent:<asp:DropDownList ID="ddlParentID" runat="server" Width="90px"></asp:DropDownList><br />
                    Text:  <asp:TextBox ID="txtNodeName" runat="server" Width="85px"></asp:TextBox><br />
                    <asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClick="btnSubmit_Click" />
                    <asp:Button ID="btnDelete" runat="server" Text="Delete" OnClick="btnDelete_Click" />
                </td>
                <td valign="top" >
                    <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
                    </asp:ContentPlaceHolder>
                </td>
            </tr>

       </table>
    </div>
    </form>
</body>
</html>

后台：

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 Master_MasterPage : System.Web.UI.MasterPage
{

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            TreeleftBind();
            bindGroup();
        }
    }
    #region 绑定树
    private void TreeleftBind()
    {
        this.TreeLeft.Nodes.Clear();
        DataTable dt = master.Getdt();
        DataView dv = new DataView(dt);
        dv.RowFilter = "TreeParentID = 0";
        TreeNode node = new TreeNode();
        foreach (DataRowView drv in dv)
        {
            node.Text = drv["TreeName"].ToString();
            node.Value = drv["ID"].ToString();
            node.Expanded = true;
            this.TreeLeft.Nodes.Add(node);
            AddReplies(dt, node);
        }
    }
    private void AddReplies(DataTable dt, TreeNode node)
    {

        DataView dv = new DataView(dt);

        dv.RowFilter = "TreeParentID='" + node.Value + "'";
        foreach (DataRowView row in dv)
        {
            TreeNode replyNode = new TreeNode();
            replyNode.Text = row["TreeName"].ToString();
            replyNode.Value = row["ID"].ToString();
            replyNode.NavigateUrl = row["Link"].ToString();
            replyNode.Expanded = false;
            node.ChildNodes.Add(replyNode);
            replyNode.ShowCheckBox = true;

            AddReplies(dt, replyNode);
        }

    }
    #endregion

    #region 绑定DropDownList
    private void bindGroup()
    {
        this.ddlParentID.Items.Clear();
        DataTable dt = master.Getdt(); //获取所有节点
        if (dt.Rows.Count > 0)
        {
            foreach (DataRow row in dt.Rows)
            {
                if (row["TreeParentID"].ToString().Trim() == "0")//绑定根节点
                {
                    this.ddlParentID.Items.Add(new ListItem(row["TreeName"].ToString(), row["Id"].ToString()));
                    this.bindDropChildItem(this.ddlParentID, dt, row["ID"].ToString(), 1);
                }
            }
        }
    }
    private void bindDropChildItem(DropDownList d, DataTable dt, string id, int length)
    {
        DataRow[] rows = dt.Select("TreeParentID='" + id + "'", "Id ASC");//取出id子节点进行绑定
        for (int i = 0; i < rows.Length; i++)
        {
            this.ddlParentID.Items.Add(new ListItem(this.SpaceLength(length) + rows[i]["TreeName"].ToString(), rows[i]["Id"].ToString()));
            this.bindDropChildItem(d, dt, rows[i]["Id"].ToString(), length + 1);//空白数目加1
        }
    }
    private string SpaceLength(int i)
    {
        string space = "";
        for (int j = 0; j < i; j++)
        {
            space += "--";
        }
        return space;
    }
    #endregion

    #region 动态增加节点
    protected void btnSubmit_Click(object sender, EventArgs e)
    {
        string rootID = ddlParentID.SelectedValue.ToString();
        string txtName = this.txtNodeName.Text;
        master.InsertNode("AutoTree", "TreeName", "TreeParentID",txtName,rootID);
        this.txtNodeName.Text = "";
        TreeleftBind();
        bindGroup();
    }
    #endregion

    #region 动态删除节点
    protected void btnDelete_Click(object sender, EventArgs e)
    {
        if (TreeChecked() != 0)
        {
            string strjavascript = "<script language='javascript'>alert('You cant delete the node which have childnode!')</script>";
            Page.ClientScript.RegisterStartupScript(this.GetType(), "onclick", strjavascript);
        }
        else
        {
            foreach (TreeNode node in TreeLeft.CheckedNodes)
            {

                string SelectTreeID = node.Value;
                master.DeleteRecords(SelectTreeID);
            }
            TreeleftBind();
            bindGroup();
        }
    }
    protected int TreeChecked()
    {
        int count = 0;
        foreach (TreeNode node in this.TreeLeft.CheckedNodes)
        {
            if (node.ChildNodes.Count > 0)
            {
                count = count + 1;
            }
        }
        return count;
    }
    #endregion

    #region 页面跳转
    protected void TreeLeft_SelectedNodeChanged(object sender, EventArgs e)
    {
        TreeNode node = TreeLeft.SelectedNode;
        if (node.ChildNodes.Count != 0)
        {
            node.SelectAction = TreeNodeSelectAction.Expand;
            node.Expanded = true;
        }
        else
        {
            string url = "@" + node.NavigateUrl;
            Response.Redirect(url);//数据库中LINK字段的数据为：~/WOW/Moniqi.aspx
            //Response.Redirect(@"~/Yule/wowmoni.aspx");

        }
    }
    #endregion
}

类：

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;
using System.Data.SqlClient;

/// <summary>
/// Summary description for master
/// </summary>
public class master
{

    public master()
    {
        //
        // TODO: Add constructor logic here
        //
    }

    /// <summary>
    /// 删除节点
    /// </summary>
    /// <param name="datakey"></param>
    public static void DeleteRecords(string datakey)
    {
        string strDelete = String.Format("DELETE FROM [AutoTree] where ID = {0}", datakey);
        GetDB.cmdExecute(strDelete);
    }

    /// <summary>
    /// 返回DataTable
    /// </summary>
    /// <returns></returns>
    public static DataTable Getdt()
    {
        SqlConnection cn = GetDB.GetConnect();
        string strSQL = "select * from AutoTree";
        SqlDataAdapter da = new SqlDataAdapter(strSQL, cn);
        DataTable dt = new DataTable();
        da.Fill(dt);
        return dt;
    }

    /// <summary>
    /// 为Tree添加新节点
    /// </summary>
    /// <param name="tblName"></param>
    /// <param name="_TreeName"></param>
    /// <param name="_TreeParentID"></param>
    /// <param name="txtName"></param>
    /// <param name="rootID"></param>
    public static void InsertNode(string tblName, string _TreeName, string _TreeParentID, string txtName,string rootID)
    {
        using (SqlConnection Conn = GetDB.GetConnect())
        {
            SqlCommand cmd = new SqlCommand(String.Format("insert into {0} ({1},{2}) values (@TreeName,@TreeParentID)",tblName,_TreeName,_TreeParentID), Conn);
            cmd.Parameters.Add("@TreeName", SqlDbType.NVarChar, 50).Value = txtName;
            cmd.Parameters.Add("@TreeParentID", SqlDbType.NVarChar, 50).Value = rootID;
            Conn.Open();
            cmd.ExecuteNonQuery();
            Conn.Close();
        }
    }
}

图：

posted @ 2007-11-29 14:00 早班火车阅读(706) 评论(1) 编辑收藏举报

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树的操作（绑定数据库，添加新节点，删除节点）(转载加实现)

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