ASP.net 怎么取datalist中子控件的值！！

Question

按钮编辑是在编辑datelist 模板时加的  现在是想通过点击编辑按钮 然后获取到图片中的社团名称，其中社团名称是用的一个label来显示的。代码如下：
 <td>社团名称：</td>
                                            <td>
                                                <asp:Label ID="user_stname" runat="server" Text='<%# Eval("user_shetuan") %>'></asp:Label>
                                            </td>尝试了搜索到的内容如 调用datalist的 ItemCommand 事件  然后给编辑按钮定义 CommandName 值 将CommandName的值作为进行的操作的判断条件
if（e.CommandName=="bianji"）{
         int cmtid=int.parse(e.CommandArgument.ToString());
         Label  lb=(Label)e.Item.FindControl("user_stname")
         Session["stname"]=la.ToString();
}
结果得到的Session["stname"]一直为空或是下面的
foreach (DataListItem item in  DataList1.Items)        {
     控件类型  s = DataList1.FIndControl("id") as 控件类型;
     这里就可以对s 作相应的处理了
}
所取得的值都仍是为空  真心烦透了！！！！！不知道是哪里出了问题！谁能告诉我该怎么办！还有我给代码顶部加了 EnableEventValidation="false"  这个应该不影响吧！

Answer 1

aspx页面代码：
<asp:Panel ID="daishenhePanel" runat="server">
                        <center>
                        <asp:Panel runat="server" ID="xianshi" Height="212px">
                            <asp:DataList ID="DataList2" runat="server" OnItemCommand="DataList2_ItemCommand">
                                <ItemTemplate>
                                    <table class="auto-style1">
                                        <tr>
                                            <td>社团名称：</td>
                                            <td>
                                                <asp:Label ID="user_stname" runat="server" Text='<%# Eval("user_shetuan") %>'></asp:Label>
                                            </td>
                                            <td>活动名称：</td>
                                            <td>
                                                <asp:Label ID="huodong_name" runat="server" Text='<%# Eval("huodong_name") %>'></asp:Label>
                                            </td>
                                            <td>活动类型：</td>
                                            <td>
                                                <asp:Label ID="huodong_leixing" runat="server" Text='<%# Eval("huodong_leixing") %>'></asp:Label>
                                            </td>
                                        </tr>
                                        <tr>
                                            <td>开始时间：</td>
                                            <td>
                                                <asp:Label ID="huodong_kaishi" runat="server" Text='<%# Eval("huodong_kaishi") %>'></asp:Label>
                                            </td>
                                            <td>活动人数</td>
                                            <td>
                                                <asp:Label ID="huodong_renshu" runat="server" Text='<%# Eval("huodong_renshu") %>'></asp:Label>
                                            </td>
                                            <td>活动地点</td>
                                            <td>
                                                <asp:Label ID="huodong_didian" runat="server" Text='<%# Eval("huodong_didian") %>'></asp:Label>
                                            </td>
                                        </tr>
                                        <tr>
                                            <td>结束时间：</td>
                                            <td>
                                                <asp:Label ID="huodong_jieshu" runat="server" Text='<%# Eval("huodong_jieshu") %>'></asp:Label>
                                            </td>
                                            <td>活动介绍</td>
                                            <td colspan="3" rowspan="2">
                                                <asp:Label ID="huodong_jieshao" runat="server" Text='<%# Eval("huodong_jieshao") %>'></asp:Label>
                                            </td>
                                        </tr>
                                        <tr>
                                            <td>理由</td>
                                            <td colspan="2">
                                                <asp:TextBox ID="TextBox1" runat="server" Height="50px"></asp:TextBox>
                                            </td>
                                        </tr>
                                        <tr>
                                            <td colspan="2">
                                                <asp:Button ID="jujue" runat="server" Text="拒绝" />
                                            </td>
                                            <td colspan="2">
                                                <asp:Button ID="tongguo" runat="server" Text="通过" />
                                            </td>
                                            <td colspan="2">
                                                <asp:Button ID="bianji" runat="server" CommandName="bianji"  Text="编辑" OnClick="bianji_Click" />
                                            </td>
                                        </tr>
                                    </table>
                                </ItemTemplate>
                            </asp:DataList>
                        </asp:Panel>

Answer 2

首先，代码 e.Item.FindControl("user_stname") 应该能找到相应的 Label。如果找不到，那么说明你的程序中的 bug 不仅仅只是这一点，应该是隐藏着巨大的 bug，可能页面回发之后所有的状态都乱了或者丢了。其次，个别的时候，你可以为控件自定义属性，绑定任意你需要的值。例如写<asp:Button ID="bianji" runat="server" CommandName="bianji"  Text="编辑" OnClick="bianji_Click"  我要的='<%# Eval("user_shetuan") %>' />
那么就可以在你的代码中直接写Button btn = (Button)sender;
string value = btn.Attributes["我要的"];这就能取到自定义的属性值。此时就不用去别的地方去找了。

Answer 3

不过，无论如何你使用自定义属性来获取值，在你有闲功夫的时候，还是要回到前一个 FindControl 的 bug 上去调试。因为那隐含着是一个深层次的技术问题。

Answer 4

注意，第二点中我说的是 bianji_Click 事件处理的逻辑。一般来说我们都在离触发事件“的控件最近的”那个事件来处理逻辑，尽量不去扩大化到其冒泡上层去处理事件。

Answer 5

 <table cellspacing="0" class="auto-style1">
            <tr>
                <td>活动审核页面</td>
            </tr>
            <tr>
                <td>
                    <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="待审核的活动" />
&nbsp;&nbsp;&nbsp;
                    <asp:Button ID="Button2" runat="server" Text="已通过的活动" OnClick="Button2_Click" />
&nbsp;&nbsp;
                    <asp:Button ID="Button3" runat="server" Text="未通过的活动" OnClick="Button3_Click" />
                </td>
            </tr>
            <tr>
                <td>
                    <asp:Panel ID="daishenhePanel" runat="server">
                        <center>
                        <asp:Panel runat="server" ID="xianshi" Height="212px">
                            <asp:DataList ID="DataList2" runat="server" OnItemCommand="DataList2_ItemCommand">
                                <ItemTemplate>
                                    <table class="auto-style1">
                                        <tr>
                                            <td>社团名称：</td>
                                            <td>
                                                <asp:Label ID="user_stname" runat="server" Text='<%# Eval("user_shetuan") %>'></asp:Label>
                                            </td>
                                            <td>活动名称：</td>
                                            <td>
                                                <asp:Label ID="huodong_name" runat="server" Text='<%# Eval("huodong_name") %>'></asp:Label>
                                            </td>
                                            <td>活动类型：</td>
                                            <td>
                                                <asp:Label ID="huodong_leixing" runat="server" Text='<%# Eval("huodong_leixing") %>'></asp:Label>
                                            </td>
                                        </tr>
                                        <tr>
                                            <td>开始时间：</td>
                                            <td>
                                                <asp:Label ID="huodong_kaishi" runat="server" Text='<%# Eval("huodong_kaishi") %>'></asp:Label>
                                            </td>
                                            <td>活动人数</td>
                                            <td>
                                                <asp:Label ID="huodong_renshu" runat="server" Text='<%# Eval("huodong_renshu") %>'></asp:Label>
                                            </td>
                                            <td>活动地点</td>
                                            <td>
                                                <asp:Label ID="huodong_didian" runat="server" Text='<%# Eval("huodong_didian") %>'></asp:Label>
                                            </td>
                                        </tr>
                                        <tr>
                                            <td>结束时间：</td>
                                            <td>
                                                <asp:Label ID="huodong_jieshu" runat="server" Text='<%# Eval("huodong_jieshu") %>'></asp:Label>
                                            </td>
                                            <td>活动介绍</td>
                                            <td colspan="3" rowspan="2">
                                                <asp:Label ID="huodong_jieshao" runat="server" Text='<%# Eval("huodong_jieshao") %>'></asp:Label>
                                            </td>
                                        </tr>
                                        <tr>
                                            <td>理由</td>
                                            <td colspan="2">
                                                <asp:TextBox ID="TextBox1" runat="server" Height="50px"></asp:TextBox>
                                            </td>
                                        </tr>
                                        <tr>
                                            <td colspan="2">
                                                <asp:Button ID="jujue" runat="server" Text="拒绝" />
                                            </td>
                                            <td colspan="2">
                                                <asp:Button ID="tongguo" runat="server" Text="通过" />
                                            </td>
                                            <td colspan="2">
                                                <asp:Button ID="bianji" runat="server" CommandName="bianji"  Text="编辑" OnClick="bianji_Click" />
                                            </td>
                                        </tr>
                                    </table>
                                </ItemTemplate>
                            </asp:DataList>
                        </asp:Panel>
                            </center>
                        <br />
                        <asp:Panel ID="xiugai" runat="server">
                            <center>
                            <table class="auto-style9">
                                        <tr>
                                            <td> 社团名称:</td>
                                            <td>
                                                <asp:Label ID="stname" runat="server" ></asp:Label>
                                            </td>
                                            <td>活动名称:</td>
                                            <td>
                                                <asp:Label ID="mingcheng1" runat="server" ></asp:Label>
                                            </td>
                                            <td>活动类型:</td>
                                            <td>
                                                <asp:Label ID="leixing1" runat="server" ></asp:Label>
                                            </td>
                                        </tr>
                                        <tr>
                                            <td>开始时间:</td>
                                            <td>
                                                <asp:Label ID="kaishi1" runat="server" ></asp:Label>
                                            </td>
                                            <td>活动人数:</td>
                                            <td>
                                                <asp:Label ID="renshu1" runat="server" ></asp:Label>
                                            </td>
                                            <td>活动地点:</td>
                                            <td>
                                                <asp:Label ID="didian1" runat="server"></asp:Label>
                                            </td>
                                        </tr>
                                        <tr>
                                            <td>结束时间:</td>
                                            <td>
                                                <asp:Label ID="jieshu1" runat="server" ></asp:Label>
                                            </td>
                                            <td>活动介绍:</td>
                                            <td colspan="3" rowspan="2">
                                                <asp:Label ID="jieshao1" runat="server"  ></asp:Label>
                                            </td>
                                        </tr>
                                        <tr>
                                            <td class="auto-style8">理由:</td>
                                            <td class="auto-style6" colspan="2">
                                                <asp:TextBox ID="liyou1" runat="server" Height="53px" Width="137px"></asp:TextBox>
                                            </td>
                                        </tr>
                                        <tr>
                                            <td class="auto-style4" colspan="2">&nbsp;</td>
                                            <td class="auto-style7">
                                                <asp:Button ID="Button7" runat="server" Text="通过" />
                                            </td>
                                            <td>
                                                <asp:Button ID="Button8" runat="server" Text="编辑" />
                                            </td>
                                        </tr>
                                    </table>
                                </center>
                        </asp:Panel>
                        </asp:Panel>
                    <asp:Panel ID="yitongguoPanel" runat="server">
                        </asp:Panel>
                    <asp:Panel ID="weitongguoPanel" runat="server">
                        </asp:Panel>
                </td>
            </tr>
            <tr>
                <td>1</td>
            </tr>
        </table>

Answer 6

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Configuration;
using System.Data;
using System.Data.SqlClient;public partial class huodongshenhe : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        daishenhePanel.Visible = true;
        xianshi.Visible = true;
        xiugai.Visible = false;
        string strConn = WebConfigurationManager.ConnectionStrings["stglxtConnectionString"].ConnectionString;
        SqlConnection con = new SqlConnection(strConn);
        DataSet ds = new DataSet();
        con.Open();
        SqlDataAdapter sqld = new SqlDataAdapter("SELECT user_shetuan,huodong_name,huodong_leixing,huodong_renshu,huodong_kaishi,huodong_jieshu,huodong_didian,huodong_jieshao FROM huodong_shenhe ", con);
        sqld.Fill(ds, "user");
        DataTable dTable = ds.Tables["user"];
        DataList2.DataSource = dTable;
        DataList2.DataBind();
        
        con.Close();
        con = null;
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        daishenhePanel.Visible = true;
        yitongguoPanel.Visible = false;
        weitongguoPanel.Visible = false;
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        daishenhePanel.Visible = false;
        yitongguoPanel.Visible = true;
        weitongguoPanel.Visible = false;
    }
    protected void Button3_Click(object sender, EventArgs e)
    {
        daishenhePanel.Visible = false;
        yitongguoPanel.Visible = false;
        weitongguoPanel.Visible = true;
    }
    protected void bianji_Click(object sender, EventArgs e)
    {
        xianshi.Visible = false;
        xiugai.Visible = true;        
}
    protected void DataList2_ItemCommand(object source, DataListCommandEventArgs e)
    {
        if (e.CommandName == "bianji") {
            foreach (DataListItem item in this.DataList2.Items)
            {
                ((Label)item.FindControl("user_stname")).Visible = false;
                string num = ((Label)e.Item.FindControl("user_stname")).Text;
                
                this.stname.Text = num;
                
            }
        }
    }
}

Answer 7

有两个panel  其中从xianshi panel中的datalist中取值后传递到xiugai panel中 同时xianshi False