TreeView的子节点和父节点级联选中

来源：互联网发布：淘宝标签怎么设置编辑：程序博客网时间：2024/04/30 17:18

来自：http://blog.sina.com.cn/s/blog_4979b49e0100aq29.html

Default.aspx：

<%@ Page Language="C#" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!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>测试树的级联选中和取消</title>

</head>
<body>
    <form id="form1" runat="server">
        <div>
            <asp:TreeView ID="TreeView1" runat="server" OnTreeNodeCheckChanged="TreeView1_TreeNodeCheckChanged"
                ShowCheckBoxes="All" ShowLines="True">
                <Nodes>
                    <asp:TreeNode Text="根节点" Value="1">
                        <asp:TreeNode Text="一级节点1" Value="11">
                            <asp:TreeNode Text="二级节点1" Value="111">
                                <asp:TreeNode Text="三级节点1" Value="1111"></asp:TreeNode>
                            </asp:TreeNode>
                            <asp:TreeNode Text="二级节点2" Value="112"></asp:TreeNode>
                        </asp:TreeNode>
                        <asp:TreeNode Text="一级节点2" Value="12">
                            <asp:TreeNode Text="121" Value="121"></asp:TreeNode>
                        </asp:TreeNode>
                        <asp:TreeNode Text="一级节点3" Value="13"></asp:TreeNode>
                    </asp:TreeNode>
                </Nodes>
            </asp:TreeView>
             </div>
    </form>
</body>
</html>

Default.aspx.cs：

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;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            this.TreeView1.Attributes.Add("onclick", "postBackByObject()");
        }
    }

    protected void TreeView1_TreeNodeCheckChanged(object sender, TreeNodeEventArgs e)
    {
        if (e.Node.Checked)
        {
            SetChildChecked(e.Node);
            SetParentChecked(e.Node);
            // 此处添加选中后会影响的其他事件
        }

        else
        {
            CancelChildChecked(e.Node);
            // 此处添加取消后会影响的其他事件
        }
    }

    /// <summary>
    /// 选中父节点，其所有子节点也选中
    /// </summary>
    /// <param name="parentNode"></param>
    private void SetChildChecked(TreeNode parentNode)
    {
        foreach (TreeNode tn in parentNode.ChildNodes)
        {
            tn.Checked = true;

            if (tn.ChildNodes.Count > 0)
            {
                SetChildChecked(tn);
            }
        }
    }

    /// <summary>
    /// 选中子节点，其父节点也选中
    /// </summary>
    /// <param name="childNode"></param>
    private void SetParentChecked(TreeNode childNode)
    {
        if (childNode.Parent != null)
        {
            childNode.Parent.Checked = true;

            SetParentChecked(childNode.Parent);
        }
    }

    /// <summary>
    /// 取消父节点，其所有子节点也取消
    /// </summary>
    /// <param name="parentNode"></param>
    private void CancelChildChecked(TreeNode parentNode)
    {
        foreach (TreeNode tn in parentNode.ChildNodes)
        {
            tn.Checked = false;

            if (tn.ChildNodes.Count > 0)
            {
                CancelChildChecked(tn);
            }
        }
    }
}