我在asp.net中有一个listview，如下所示：
<asp:ListView ID="lvLoads" DataKeyNames="BookingId" OnItemCommand="lvLoads_OnItemCommand" runat="server">
<EmptyDataTemplate>
<table>
<tr>
<td>No data was returned.</td>
</tr>
</table>
</EmptyDataTemplate>
<GroupTemplate>
<asp:PlaceHolder ID="itemPlaceholder" runat="server"></asp:PlaceHolder>
</GroupTemplate>
<ItemTemplate>
<fieldset>
<table class="table table-striped table-responsive">
<thead>
<tr class="hidden-lg">
<th width="15%">Type</th>
<th width="31%">Details</th>
<th width="25%">Distance/Duration</th>
<th width="21%"> </th>
</tr>
</thead>
<tbody>
<tr>
<td width="15%">
<asp:Label CssClass="hide" ID="lblBokingId" runat="server"><%# Eval("BookingId") %></asp:Label>
<asp:Label ID="lblLoadTypeName" runat="server"> <%# Eval("LoadTypeName") %></asp:Label>
<br>
</td>
<td width="21%">
<asp:LinkButton ID="btnViewMore" CssClass="btn btn-warning" CommandName="ViewMore" runat="server">View More</asp:LinkButton>
</td>
</tr>
</tbody>
</table>
</fieldset>
</ItemTemplate>
</asp:ListView>
现在点击按钮ViewMore我写了这段代码来提取listviewItem的值：
var id = ((Label)e.Item.FindControl("lblBookingId")).Text;
var name = ((Label)e.Item.FindControl("lblLoadTypeName")).Text;
但是e.Item.FindControl("lblBookingId")总是为空。我使用chrome的inspect元素检查了页面的html，看到我的id以某种方式改为ContentSection_ctl00_lblLoadTypeName_0
我真的被这个困住了。请帮我。 Thanx in Advance
答案 0 :(得分：0)
我已经对你的列表视图做了一些工作，并且我创建了一个类似于问题的工作。
<强> Default2.aspx：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<div>
WORKING EXAMPLE
<asp:ListView ID="lvLoads" runat="server">
<LayoutTemplate>
<table border="0" cellpadding="1">
<tr style="background-color: #E5E5FE">
<th align="left">EmployeeId
</th>
<th align="left">LastName
</th>
<th align="left"></th>
</tr>
<tr runat="server" id="itemPlaceholder" />
</table>
</LayoutTemplate>
<ItemTemplate>
<tr id="Tr1" runat="server">
<td id="Td1" runat="server">
<asp:Label ID="lblCustomerID" runat="server" Text='<%# Eval("BookingId") %>'></asp:Label>
</td>
<td id="Td2" runat="server">
<asp:Label ID="lblLastName" runat="server" Text='<%# Eval("LoadTypeName") %>'></asp:Label>
</td>
<td id="Td3" runat="server">
<asp:LinkButton ID="lnkSelect" runat="server" OnClick="btnViewMore_Click" Text="Select" />
</td>
</tr>
</ItemTemplate>
</asp:ListView>
</div>
<div>
ERROR
<asp:ListView ID="ListView1" DataKeyNames="BookingId" OnItemCommand="lvLoads_OnItemCommand" runat="server">
<EmptyDataTemplate>
<table>
<tr>
<td>No data was returned.</td>
</tr>
</table>
</EmptyDataTemplate>
<GroupTemplate>
<asp:PlaceHolder ID="itemPlaceholder" runat="server"></asp:PlaceHolder>
</GroupTemplate>
<ItemTemplate>
<fieldset>
<table class="table table-striped table-responsive">
<thead>
<tr class="hidden-lg">
<th width="15%">Type</th>
<th width="31%">Details</th>
<th width="25%">Distance/Duration</th>
<th width="21%"> </th>
</tr>
</thead>
<tbody>
<tr>
<td width="15%">
<asp:Label CssClass="hide" ID="lblBokingId" runat="server"><%# Eval("BookingId") %></asp:Label>
<asp:Label ID="lblLoadTypeName" runat="server"> <%# Eval("LoadTypeName") %></asp:Label>
<br>
</td>
<td width="21%">
<asp:LinkButton ID="btnViewMore" CssClass="btn btn-warning" OnClick="btnViewMore_Click1" runat="server">View More</asp:LinkButton>
</td>
</tr>
</tbody>
</table>
</fieldset>
</ItemTemplate>
</asp:ListView>
</div>
</div>
</form>
<强> Default2.aspx.cs：
public partial class Default2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Class1 obj = new Class1();
lvLoads.DataSource = obj.bind();
lvLoads.DataBind();
ListView1.DataSource = obj.bind();
ListView1.DataBind();
}
protected void lvLoads_OnItemCommand(object sender, ListViewCommandEventArgs e)
{
}
protected void btnViewMore_Click(object sender, EventArgs e)
{
LinkButton btn = sender as LinkButton;
ListViewDataItem item = (ListViewDataItem)(sender as Control).NamingContainer;
Label lblStatus = (Label)item.FindControl("lblLastName");
string message = lblStatus.Text;
}
protected void btnViewMore_Click1(object sender, EventArgs e)
{
LinkButton btn = sender as LinkButton;
ListViewDataItem item = (ListViewDataItem)(sender as Control).NamingContainer;
Label lblStatus = (Label)item.FindControl("lblLoadTypeName");
string message = lblStatus.Text;
}
}
<强>的Class1：
public class Class1
{
public int BookingId { get; set; }
public string LoadTypeName { get; set; }
public Class1()
{
}
public List<Class1> bind()
{
List<Class1> data = new List<Class1>();
Class1 obj = new Class1();
obj.BookingId = 1;
obj.LoadTypeName = "Type name1";
data.Add(obj);
obj = new Class1();
obj.BookingId = 2;
obj.LoadTypeName = "Type name2";
data.Add(obj);
obj = new Class1();
obj.BookingId = 3;
obj.LoadTypeName = "Type name3";
data.Add(obj);
obj = new Class1();
obj.BookingId = 4;
obj.LoadTypeName = "Type name4";
data.Add(obj);
return data;
}
}
正如您在两个列表视图中所看到的，您只在列表视图中使用与设计相关的问题。请根据您的要求更改设计。
您将控件放在其他控件中，这就是id在运行时更改的原因。
希望它会对你有所帮助。