在我开始之前，还有另一个问题有一个类似的标题，它没有解决，但我的情况是非常不同的，因为我使用Ajax。
我最近在我的Ajax UpdateProgress控件中添加了一个标签，由于某种原因，我的asp.net页面没有读取它。我最初的目标是在长方法运行时不断更新标签文本。我正在使用代码，我相信标签已声明。我会发布我的.cs页面，如果有人想通读它（它不会太长），所有我的其他标签工作完美，即使我采取标签OUT的ajax控件它将工作正常（不是文本更新虽然）。我需要使用某个Ajax标签吗？
我很困惑为什么会发生错误。确切的错误消息指出：“当前上下文中不存在名称'lblProgress'。我使用c＃，ajax控件，asp.net页面和visual studio。此程序将文件上传到客户端并将信息存储在如果有人可以提供帮助，我会非常感激。提前致谢！
using System;
using System.Data;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Net;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;
using System.Threading;
public partial class SendOrders : System.Web.UI.Page
{
protected enum EDIType
{
Notes,
Details
}
protected static string NextBatchNum = "1";
protected static string FileNamePrefix = "";
protected static string OverBatchLimitStr = "Batch file limit has been reached. No more batches can be processed today.";
protected void Page_Load(object sender, EventArgs e)
{
Initialize();
}
protected void Page_PreRender(object sender, EventArgs e)
{
}
protected void Button_Click(object sender, EventArgs e)
{
PutFTPButton.Enabled = false;
lblProgress.Visible = true;
lblProgress.Text = "Preparing System Checks...";
Thread.Sleep(3000);
Button btn = (Button)sender;
KaplanFTP.BatchFiles bf = new KaplanFTP.BatchFiles();
KaplanFTP.Transmit transmit = new KaplanFTP.Transmit();
if (btn.ID == PutFTPButton.ID)
{
lblProgress.Text = "Locating Files...";
//bf.ReadyFilesForTransmission();
DirectoryInfo dir = new DirectoryInfo(@"C:\Kaplan");
FileInfo[] BatchFiles = bf.GetBatchFiles(dir);
bool result = transmit.UploadBatchFilesToFTP(BatchFiles);
lblProgress.Text = "Sending Files to Kaplan...";
if (!result)
{
ErrorLabel.Text += KaplanFTP.errorMsg;
return;
}
bf.InsertBatchDataIntoDatabase("CTL");
bf.InsertBatchDataIntoDatabase("HDR");
bf.InsertBatchDataIntoDatabase("DET");
bf.InsertBatchDataIntoDatabase("NTS");
List<FileInfo> allfiles = BatchFiles.ToList<FileInfo>();
allfiles.AddRange(dir.GetFiles("*.txt"));
bf.MoveFiles(allfiles);
lblProgress.Text = "Uploading File Info to Database...";
foreach (string order in bf.OrdersSent)
{
OrdersSentDiv.Controls.Add(new LiteralControl(order + "<br />"));
}
OrdersSentDiv.Visible = true;
OrdersInfoDiv.Visible = false;
SuccessLabel.Visible = true;
NoBatchesToProcessLbl.Visible = true;
BatchesToProcessLbl.Visible = false;
PutFTPButton.Enabled = false;
BatchesCreatedLbl.Text = int.Parse(NextBatchNum).ToString();
Thread.Sleep(20000);
if (KaplanFTP.errorMsg.Length != 0)
{
ErrorLabel.Visible = true;
SuccessLabel.Visible = false;
ErrorLabel.Text = KaplanFTP.errorMsg;
}
}
}
这也是我的aspx代码。
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="SendOrders.aspx.cs" Inherits="SendOrders" %>
<!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 id="Head1" runat="server">
<title>Kaplan EDI Manager</title>
<link href="css/style.css" rel="stylesheet" type="text/css" />
<style type="text/css">
.style1
{
width: 220px;
height: 19px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div class="mainPanel">
<div>
<h3>Number of Batches Created Today: <asp:Label runat="server" style="display:inline;" ID="BatchesCreatedLbl"></asp:Label>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<span class="red">COUNTDOWN TO SUBMISSION!</span>
<span id="timespan" class="red"></span>
</h3>
</div>
<div id="batchestoprocessdiv">
</div>
</asp:UpdatePanel>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Label ID="BatchesToProcessLbl" runat="server" CssClass="green"
Height="22px" Text="THERE IS AN ORDER BATCH TO PROCESS."></asp:Label>
<asp:Label ID="NoBatchesToProcessLbl" runat="server" CssClass="red"
Text="There are no Order Batches to Process." Visible="false"></asp:Label>
<asp:Button ID="PutFTPButton" runat="server" onclick="Button_Click"
Text="Submit Orders" />
<asp:Label ID="SuccessLabel" runat="server" CssClass="green"
Text="Batch has been processed and uploaded successfully." Visible="false"></asp:Label>
<asp:Label ID="ErrorLabel" runat="server" CssClass="red" Text="Error: "
Visible="false"></asp:Label>
<asp:Label ID="lblProgress" runat="server" CssClass="green" Height="16px"
Text="Label" Visible="False"></asp:Label>
<br />
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdateProgress ID="UpdateProgress1" runat="server"
AssociatedUpdatePanelID="UpdatePanel1">
<ProgressTemplate>
<br />
<img alt="" class="style1" src="images/ajax-loader.gif" />
</ProgressTemplate>
</asp:UpdateProgress>
</div>
<div id="OrdersInfoDiv" runat="server" visible="false">
<asp:GridView ID="BatchDetails" Caption="Details of orders ready to be sent" runat="server" AutoGenerateColumns="true"
CssClass="InfoTable" AlternatingRowStyle-CssClass="InfoTableAlternateRow" >
</asp:GridView>
</div>
<div id="OrdersSentDiv" class="mainPanel" runat="server" visible="false">
<h4>Sent Orders</h4>
</div>
</form>
<script src="js/SendOrders.js" type="text/javascript"></script>
</body>
</html>
答案 0 :(得分：1)
如果在UpdateProgress控件中创建了Label，那么您将需要执行类似这样的操作
((Label)upUpdateProgress.FindControl("lblProgress")).Text = "Uploading File...";
答案 1 :(得分：1)
如果在标记中声明控件并且代码隐藏无法识别它，那么您的designer.cs文件可能不同步。有几种方法可以解决这个问题：
lblProgress designer.cs文件以下是手动添加的方法：
/// <summary>
/// lblProgress control.
/// </summary>
/// <remarks>
/// Auto-generated field.
/// To modify move field declaration from designer file to code-behind file.
/// </remarks>
protected global::System.Web.UI.WebControls.Label lblProgress;
修改
注意到您将UpdatePanel放在UpdateProgress控件中，在这种情况下，您需要使用FindControl（如 @Valeklosse ）引用它