动态生成TREEVIEW后SelectedNodeChange事件问题

动态生成TREEVIEW后，只有个别节点可以进入到SelectedNodeChange事件，就算是个别节点进入了这个事件，获取到的值也是错误的，好像是因为一直select的第一个节点，有大神知道为什么吗？ --------------------编程问答-------------------- 求大神提示啊！ --------------------编程问答-------------------- 我只是想要获取到节点上绑定的value就好了！ --------------------编程问答-------------------- 求助求助。。。 --------------------编程问答-------------------- 没深研究过。换AfterSelect事件，用TreeNode tn = e.Node;//获得选中的结点试试 --------------------编程问答-------------------- 不知道你是如何“动态生成”的。或许你可以看看你是不是缺少 if(!IsPotstback）判断，等等。

我这里有一个demo程序，你可以对比一下你的程序的设计思路是否有异。

<%@ Page Language="C#" %>

<%@ Import Namespace="System.Collections.Generic" %>



<script runat="server">

    /// <summary>

    /// 动态加载树。你可以改为从配置文件加载

    /// </summary>

    /// <param name="sender"></param>

    /// <param name="e"></param>

    protected void TreeView1_TreeNodePopulate(object sender, TreeNodeEventArgs e)

    {

        switch (e.Node.Value)

        {

            case "N1":

                e.Node.ChildNodes.Add(new TreeNode { Text = "张三", Value = "a" });

                e.Node.ChildNodes.Add(new TreeNode { Text = "李四", Value = "b" });

                e.Node.ChildNodes.Add(new TreeNode { Text = "王五", Value = "c", PopulateOnDemand = true });

                break;

            case "N2":

                e.Node.ChildNodes.Add(new TreeNode { Text = "1" });

                e.Node.ChildNodes.Add(new TreeNode { Text = "2" });

                e.Node.ChildNodes.Add(new TreeNode { Text = "3" });

                break;

            case "N3":

                e.Node.ChildNodes.Add(new TreeNode { Text = "A" });

                e.Node.ChildNodes.Add(new TreeNode { Text = "B" });

                e.Node.ChildNodes.Add(new TreeNode { Text = "C" });

                break;

            case "c":

                e.Node.ChildNodes.Add(new TreeNode { Text = "张三他爸" });

                e.Node.ChildNodes.Add(new TreeNode { Text = "张三他妈" });

                e.Node.ChildNodes.Add(new TreeNode { Text = "张三他弟" });

                break;

        }

    }



    private List<string> 选中过的节点

    {

        get

        {

            var x = ViewState["selected"];

            if (x == null)

            {

                x = new List<string>();

                ViewState["selected"] = x;

            }

            return (List<string>)x;

        }

    }



    private void ShowLabel1()

    {

        var s = string.Empty;

        foreach (string node in 选中过的节点)

            s = node + "   " + s;

        this.Label1.Text = s;

        UpdatePanel2.Update();

    }



    protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e)

    {

        最后选中的节点 = TreeView1.SelectedNode.Value;

        选中过的节点.Add(最后选中的节点);

        PlaceHolder1.Controls.Clear();

        加载子画面();

        ShowLabel1();

    }



    private string 最后选中的节点

    {

        get

        {

            return (string)ViewState["node"];

        }

        set

        {

            if (最后选中的节点 != value)

            {

                ViewState["node"] = value;



            }

        }

    }



    /// <summary>

    /// 查找应该加载的子画面。你可以改为从配置文件查找

    /// </summary>

    private string 下边的ascx

    {

        get

        {

            switch (最后选中的节点)

            {

                case "张三他爸":

                    return "~/TestDropdownList.ascx";

                case "张三他妈":

                    return "~/TestCalendar.ascx";

                default:

                    return null;

            }

        }

    }



    protected void Page_Load(object sender, EventArgs e)

    {

        加载子画面();

    }



    private void 加载子画面()

    {

        var x = 下边的ascx;

        if (x != null)

            PlaceHolder1.Controls.Add(this.LoadControl(x));

        UpdatePanel3.Update();

    }



    protected void Button1_Click(object sender, EventArgs e)

    {

        选中过的节点.Clear();

        ShowLabel1();

        if (PlaceHolder1.Controls.Count > 0)

        {

            var x = PlaceHolder1.Controls[0] as IClear;

            if (x != null)

                x.Clear();

        }

    }

</script>

<!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>

</head>

<body>

    <form id="form1" runat="server">

        <asp:ScriptManager ID="ScriptManager1" runat="server" />

        <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">

            <ContentTemplate>

                <asp:TreeView ID="TreeView1" runat="server" ExpandDepth="0" OnTreeNodePopulate="TreeView1_TreeNodePopulate"

                    EnableClientScript="False" OnSelectedNodeChanged="TreeView1_SelectedNodeChanged">

                    <Nodes>

                        <asp:TreeNode Text="N1" Value="N1" PopulateOnDemand="true"></asp:TreeNode>

                        <asp:TreeNode Text="N2" Value="N2" PopulateOnDemand="true"></asp:TreeNode>

                        <asp:TreeNode Text="N3" Value="N3" PopulateOnDemand="true"></asp:TreeNode>

                    </Nodes>

                </asp:TreeView>

            </ContentTemplate>

        </asp:UpdatePanel>

        <asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Conditional">

            <ContentTemplate>

                你点击的节点：

            <asp:Label ID="Label1" runat="server" EnableViewState="False"></asp:Label>

                <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="清理列表" />

            </ContentTemplate>

        </asp:UpdatePanel>

        <br />

        <asp:UpdatePanel ID="UpdatePanel3" runat="server" UpdateMode="Conditional">

            <ContentTemplate>

                <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>

            </ContentTemplate>

        </asp:UpdatePanel>

    </form>

</body>

</html>

--------------------编程问答-------------------- 两个ascx文件与这个treeview无关，你可以随便用你自己的ascx取代测试。

这里也贴出来。

第一个：

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="TestDropdownList.ascx.cs" Inherits="TestDropdownList" %>



<script runat="server">

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {

            this.Calendar1.Style["position"] = "absolute";

            this.TextBox1.DataBind();

        }

    }



    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)

    {

        this.DropDownList2.Items.Clear();

        switch (this.DropDownList1.SelectedValue)

        {

            case "北京":

                var it = new ListItem("天安门广场");

                it.Attributes.Add("myIt", "sp1234");

                this.DropDownList2.Items.Add(it);

                this.DropDownList2.Items.Add("颐和园");

                this.DropDownList2.Items.Add("雍和宫");

                this.DropDownList2.Items.Add("红螺寺");

                break;

            case "上海":

                this.DropDownList2.Items.Add("崇明岛");

                this.DropDownList2.Items.Add("外滩");

                this.DropDownList2.Items.Add("万佛阁");

                break;

            case "香港":

                this.DropDownList2.Items.Add("海洋公园");

                this.DropDownList2.Items.Add("半岛酒店");

                break;

        }

    }

    protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)

    {

        ShowResult();

    }



    protected void Button1_Click(object sender, EventArgs e)

    {

        if (this.Calendar1.Visible)

            SetupTheDate();

        else

        {

            try

            {

                this.Calendar1.SelectedDate = DateTime.Parse(this.TextBox1.Text);

                this.Calendar1.VisibleDate = this.Calendar1.SelectedDate;

            }

            catch

            {

            }

            this.Calendar1.Visible = true;

        }

    }



    protected void Calendar1_SelectionChanged(object sender, EventArgs e)

    {

        SetupTheDate();

    }



    private void SetupTheDate()

    {

        this.TextBox1.Text = this.Calendar1.SelectedDate.ToShortDateString();

        this.Calendar1.Visible = false;

        ShowResult();

    }



    void ShowResult()

    {

        this.Label1.Text = "您选择" + this.TextBox1.Text + "去" + this.DropDownList2.SelectedValue;

        UpdatePanel3.Update();

    }



    public class TestABC

    {

        public string Field1 { get; set; }

        public int Field2 { set; get; }

    }

</script>

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">

    <ContentTemplate>

        <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">

            <asp:ListItem>--请选择--</asp:ListItem>

            <asp:ListItem>北京</asp:ListItem>

            <asp:ListItem>上海</asp:ListItem>

            <asp:ListItem>香港</asp:ListItem>

        </asp:DropDownList>

        <asp:DropDownList ID="DropDownList2" runat="server" AutoPostBack="True" OnSelectedIndexChanged="DropDownList2_SelectedIndexChanged" />

    </ContentTemplate>

</asp:UpdatePanel>

<br />

<table border="0" cellpadding="0" cellspacing="0">

    <tr>

        <td>请输入日期：

        </td>

        <td>

            <asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Conditional">

                <ContentTemplate>

                    <table cellpadding="0" cellspacing="0">

                        <tr>

                            <td>

                                <asp:TextBox ID="TextBox1" runat="server" Width="147px" Text="<%# DateTime.Now.AddDays(20).ToShortDateString() %>" />

                                <asp:Button ID="Button1" runat="server" Text="..." OnClick="Button1_Click" />

                            </td>

                        </tr>

                        <tr>

                            <td>

                                <asp:Calendar ID="Calendar1" runat="server" Visible="False" OnSelectionChanged="Calendar1_SelectionChanged"

                                    BackColor="#FFFFCC" BorderColor="#FFCC66" BorderWidth="1px" DayNameFormat="Shortest"

                                    Font-Names="Verdana" Font-Size="8pt" ForeColor="#663399" Height="200px" ShowGridLines="True"

                                    Width="220px">

                                    <SelectedDayStyle BackColor="#CCCCFF" Font-Bold="True" />

                                    <SelectorStyle BackColor="#FFCC66" />

                                    <TodayDayStyle BackColor="#FFCC66" ForeColor="White" />

                                    <OtherMonthDayStyle ForeColor="#CC9966" />

                                    <NextPrevStyle Font-Size="9pt" ForeColor="#FFFFCC" />

                                    <DayHeaderStyle BackColor="#FFCC66" Font-Bold="True" Height="1px" />

                                    <TitleStyle BackColor="#990000" Font-Bold="True" Font-Size="9pt" ForeColor="#FFFFCC" />

                                </asp:Calendar>

                            </td>

                        </tr>

                    </table>

                </ContentTemplate>

            </asp:UpdatePanel>

        </td>

    </tr>

</table>

<hr />

<asp:UpdatePanel ID="UpdatePanel3" runat="server" UpdateMode="Conditional">

    <ContentTemplate>

        result:

            <asp:Label ID="Label1" runat="server" EnableViewState="False" Font-Size="Small"></asp:Label>

    </ContentTemplate>

</asp:UpdatePanel>

第二个

<%@ Control Language="C#" AutoEventWireup="true" %>

<%@ Implements Interface="IClear" %>



<script runat="server">



    protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)

    {

        if (e.Day.Date == DateTime.Now.Date)

        {

            e.Cell.Style["font-size"] = "200%";

            e.Cell.Controls.Add(new Literal { Text = "（今天）" });

        }

        if (选择的.Contains(e.Day.Date))

        {

            e.Cell.ForeColor = System.Drawing.Color.LawnGreen;

            e.Cell.Controls.Clear();

            e.Cell.Controls.Add(new Image { ImageUrl = "http://avatar.csdn.net/1/8/D/2_sp1234.jpg" });

            e.Cell.Controls.Add(new Literal { Text = "选过" });

        }

    }



    private List<DateTime> 选择的

    {

        get

        {

            var obj = ViewState["selected"];

            if (obj == null)

            {

                obj = new List<DateTime>();

                ViewState["selected"] = obj;

            }

            return (List<DateTime>)obj;

        }

    }



    protected void Calendar1_SelectionChanged(object sender, EventArgs e)

    {

        var dt = Calendar1.SelectedDate;

        var lst = 选择的;

        if (!lst.Contains(dt))

            lst.Add(dt);

        Calendar1.DataBind();

    }



    public void Clear()

    {

        选择的.Clear();

        Calendar1.DataBind();

        this.Controls.Add(new Label { Text = "你清理了选择日期！" });

    }

</script>

<asp:Calendar ID="Calendar1" runat="server" OnDayRender="Calendar1_DayRender" OnSelectionChanged="Calendar1_SelectionChanged"></asp:Calendar>

--------------------编程问答--------------------



public interface IClear

{

    void Clear();

}

--------------------编程问答-------------------- 除

补充：.NET技术 ,  ASP.NET