datalist选定行取值问题

Question

如果不在datalist中添加linkbutton
那么怎么通过checkbox和一个不在datalist中的button来选中选定行并取值？
中间代码不知道咋写=.=     protected void Button3_Click(object sender, EventArgs e)
    {
        foreach (DataListItem dli in this.DataList1.Items)       
        {
            CheckBox cb = (CheckBox)dli.FindControl("check");
            if (cb.Checked == true)
            {
                  
            }
        }    }

Answer 1

    ArrayList username = new ArrayList();
    protected void Button3_Click(object sender, EventArgs e)
    {
        
        foreach (DataListItem dli in this.DataList1.Items)       
        {
            CheckBox cb = (CheckBox)dli.FindControl("check");
            if (cb.Checked == true)
            {
               Label Lab=(Label)this.DataList1.FindControl("username");
               username.Add(Lab.Text.ToString());            }
        }    }这个也取不出值，有什么问题呢？

Answer 2

foreach (DataListItem dli in this.DataList1.Items)       
        {
            CheckBox cb = (CheckBox)dli.FindControl("check");
            if (cb.Checked == true)
            {
               Label Lab=(Label)dli.FindControl("username");
               username.Add(Lab.Text.ToString());            }
        }

Answer 3

我也发现了...
现在新问题也来了 就是根本不管 CheckBox 选没选中都进不了if语句
这个是什么问题

Answer 4

FindControl 里的ID 是否正确断点跟踪一下

Answer 5

datalist数据绑定的代码放用IsPostBack判断下。

Answer 6

   <asp:CheckBox ID="check" runat="server"/>这个没错啊
就是进不去if语句 下面这个全选CheckBox倒是可以执行 很是奇怪啊.. protected void Button1_Click(object sender, EventArgs e)
    {
        if (this.Button1.Text == "全选")
        {
            foreach (DataListItem dli in this.DataList1.Items)
            {
                CheckBox cb = (CheckBox)dli.FindControl("check");
                cb.Checked=true;
            }
            this.Button1.Text = "全部取消";
        }
        else
        {
            foreach (DataListItem dli in this.DataList1.Items)
            {
                CheckBox cb = (CheckBox)dli.FindControl("check");
                cb.Checked = false;
            }
            this.Button1.Text = "全选";
        }
    }

Answer 7

页面载入的次序你没搞明白，当页面page_load后，datalist里面原本checkbox为true的都会没掉的，

Answer 8

    protected void Page_Load(object sender, EventArgs e)
    {        if (!IsPostBack)
        {
            //指定datalist数据源并绑定
        }
    }

Answer 9

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;public partial class cuser_UserC : System.Web.UI.Page
{
    ArrayList username = new ArrayList();
    protected void Page_Load(object sender, EventArgs e)
    {
        BingData();
    }
    public void BingData()
    {
        DataAccess.Class1 dataClass = new DataAccess.Class1();
        this.DataList1.DataSource = dataClass.getTable(Common.Class1.sql_user, Common.Class1.table_user).Tables[0].DefaultView;
        this.DataList1.DataBind();
    }    protected void Button3_Click(object sender, EventArgs e)
    {
        foreach (DataListItem dli in this.DataList1.Items)       
        {
            CheckBox cb = (CheckBox)dli.FindControl("check");
            if (cb.Checked == true)
            {
               Label Lab=(Label)dli.FindControl("username");
               username.Add(Lab.Text.ToString());
            }
        }    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (this.Button1.Text == "全选")
        {
            foreach (DataListItem dli in this.DataList1.Items)
            {
                CheckBox cb = (CheckBox)dli.FindControl("check");
                cb.Checked=true;
            }
            this.Button1.Text = "全部取消";
        }
        else
        {
            foreach (DataListItem dli in this.DataList1.Items)
            {
                CheckBox cb = (CheckBox)dli.FindControl("check");
                cb.Checked = false;
            }
            this.Button1.Text = "全选";
        }
    }
前台 <asp:DataList ID="DataList1" runat="server" Height="167px" Width="754px" 
                    CaptionAlign="Left">
                    <ItemStyle Font-Size="X-Small" />
                    <HeaderStyle 
            Font-Names="宋体" Font-Size="Smaller" HorizontalAlign="Center" 
            VerticalAlign="Middle" />
                    <HeaderTemplate>
                        <table><tr>
     <td align="center" dir="ltr" 
     style="width:60px;  font-family: 宋体; font-size: smaller">
     选择</td>
     td align="center" style="width:80px; font-family: 宋体; font-size: smaller">
     用户名</td>
     <td align="center" style="width:100px; font-family: 宋体; font-size: smaller">
     设备号</td>
     <td align="center" style="width:100px; font-family: 宋体; font-size: smaller">
     设备数量</td>
 </tr>
 </HeaderTemplate>
 <ItemTemplate>
 <tr>
    <td><asp:CheckBox ID="check" runat="server"/>
    </td>
    <td><asp:Label ID="username" RUNAT="server" 
    TEXT= <%#DataBinder.Eval(Container.DataItem,"username") %>></asp:Label>
    <td>
    <asp:Label ID="deviceID" RUNAT="server" 
    TEXT= <%#DataBinder.Eval(Container.DataItem, "deviceID")%>></asp:Label>
    </td>
    <td><asp:Label ID="deviceNumber" RUNAT="server" 
    TEXT= <%#DataBinder.Eval(Container.DataItem, "deviceNumber")%>></asp:Label>
    </td>
</tr>
                    </ItemTemplate>
                    <SeparatorTemplate>
                        <tr>
                        </tr>
                    </SeparatorTemplate>
                    <FooterTemplate>
                        </table>
                    </FooterTemplate>
                </asp:DataList>
   

Answer 10

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {             BingData();
        }
    }

Answer 11

你记得 操作服务器控件 引起回发 都会执行 Page_Load 并且 在 控件自己的事件前执行 就可以了。