我有一个页面正在使用3个更新面板，并且所有更新面板都运行良好。在一个更新面板中，我有一个按钮，单击该按钮会更改标签文本，但问题是，如果在任何更新面板中发生回发，则文件上传会丢失其文件。所有更新面板都用于更新页面的各个部分。没有更新面板嵌套。文件上传不在外面，即它不在任何更新面板中，但正在丢失其文件。我认为问题是完全可以理解的，不需要显示代码。谢谢
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="WalkInControl.ascx.cs"
Inherits="Modules_WalkInControl" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxtoolkit" %>
<asp:Panel ID="Panel1" runat="server" Font-Size="13px" Width="670">
<asp:UpdatePanel ID="UpdatePanel1" runat="server" ChildrenAsTriggers ="true" UpdateMode="Conditional">
<ContentTemplate>
<div class="formfieldset" style="margin-bottom: 40px;">
<div class="formrow">
<div class="paymentfrmlabels">
Check In :</div>
<div class="paymentfrmtxtbox">
<asp:TextBox ID="txtCheckIn" runat="server" Width="153px"></asp:TextBox>
<asp:ImageButton ID="imgbtnCalendar1" runat="server" ImageUrl="~/App_Themes/Default/images/ico-calendar.gif"
CausesValidation="false" Width="20" Height="20" />
<ajaxtoolkit:CalendarExtender ID="CalendarExtender2" runat="server" Format="dd/MM/yyyy"
TargetControlID="txtCheckIn" PopupButtonID="imgbtnCalendar1" />
</div>
<div class="paymentfrmvalidation">
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="[*]"
ControlToValidate="txtCheckIn" Display="Dynamic" ValidationGroup="a"></asp:RequiredFieldValidator>
</div>
</div>
<div class="formrow">
<div class="paymentfrmlabels">
Check Out:
</div>
<div class="paymentfrmtxtbox">
<asp:TextBox ID="txtCheckOut" runat="server" Width="153px"></asp:TextBox>
<asp:ImageButton ID="imgbtnCalendar" runat="server" ImageUrl="~/App_Themes/Default/images/ico-calendar.gif"
CausesValidation="false" ImageAlign="Top" Width="20" Height="20" />
<ajaxtoolkit:CalendarExtender ID="CalendarExtender1" runat="server" Format="dd/MM/yyyy"
TargetControlID="txtCheckOut" PopupButtonID="imgbtnCalendar" />
</div>
<div class="paymentfrmvalidation">
<asp:RequiredFieldValidator ID="valStartDate" runat="server" ErrorMessage="[*]" ControlToValidate="txtCheckOut"
Display="Dynamic" ValidationGroup="a"></asp:RequiredFieldValidator>
</div>
</div>
<div class="formrow">
<div class="paymentfrmlabels">
Room Type :
</div>
<div class="paymentfrmtxtbox">
<asp:DropDownList ID="drpRoomtype" runat="server" Width="172px" AutoPostBack="True"
OnSelectedIndexChanged="drpRoomtype_SelectedIndexChanged" AppendDataBoundItems="True">
</asp:DropDownList>
</div>
</div>
<div class="formrow">
<div class="paymentfrmlabels">
Plan :
</div>
<div class="paymentfrmtxtbox" style="height: 25px;">
<asp:DropDownList ID="drpPlan" Width="172px" AutoPostBack="True"
runat="server" onselectedindexchanged="drpPlan_SelectedIndexChanged1">
</asp:DropDownList>
</div>
</div>
<div class="formrow" style="height: 75px;">
<div class="paymentfrmlabels">
Room :
</div>
<div class="paymentfrmtxtbox">
<asp:ListBox ID="lstRooms" runat="server" Width="172px" SelectionMode="Multiple">
</asp:ListBox>
</div>
<div class="paymentfrmvalidation">
<asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ControlToValidate="lstRooms"
ErrorMessage="[*]" ValidationGroup="b"></asp:RequiredFieldValidator>
</div>
<div class="paymentfrmvalidation">
<asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="UpdatePanel1">
<ProgressTemplate>
<img src="../Images/loading_sm.gif" border="0" alt="">
</ProgressTemplate>
</asp:UpdateProgress>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="drpRoomtype"
ErrorMessage="[*]" ValidationGroup="a"></asp:RequiredFieldValidator>
</div>
</div>
<div class="formrow">
<div class="paymentfrmlabels">
Adults :
</div>
<div class="paymentfrmtxtbox" style="width: 50px; height: 25px;">
<asp:DropDownList ID="drpAdults" Width="50px" runat="server" AutoPostBack="True"
OnSelectedIndexChanged="drpAdults_SelectedIndexChanged" AppendDataBoundItems="True">
</asp:DropDownList>
</div>
<div class="paymentfrmlabels" style="width: 65px;">
Children :
</div>
<div class="paymentfrmtxtbox" style="width: 50px; height: 25px;">
<asp:DropDownList ID="drpChildren" Width="50px" runat="server" AutoPostBack="True"
OnSelectedIndexChanged="drpChildren_SelectedIndexChanged">
</asp:DropDownList>
</div>
</div>
<div class="formrow">
<div class="paymentfrmlabels">
Rate :</div>
<div class="paymentfrmtxtbox">
<asp:TextBox ID="txtRate" Width="153px" runat="server"></asp:TextBox>
</div>
<div class="paymentfrmvalidation">
<%--<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="txtRate"
ErrorMessage="Invalid Format" ValidationExpression="^(-)?\d+(\.\d\d)?$" ValidationGroup="a"></asp:RegularExpressionValidator>
<asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server" ControlToValidate="txtRate"
ErrorMessage="Rate Required" ValidationGroup="a"></asp:RequiredFieldValidator></div>--%>
</div>
</div> <div align="center"> <asp:Label ID="lblRoomMsg" runat="server" ForeColor="Red"></asp:Label></div>
<div class="formrow">
<div class="paymentfrmlabels">
Advance Pay:
</div>
<div class="paymentfrmtxtbox" style="height: 25px;">
<asp:TextBox ID="txtAdvance" runat="server" Width="153px">0.0</asp:TextBox>
</div>
</div>
<div class="formrow" style="text-align: right;">
<asp:LinkButton ID="lnkAdd" CssClass="btn" runat="server" Width="60px" OnClick="lnkAdd_Click1">ADD</asp:LinkButton>
</div>
<div class="formrow" style="text-align:center;">
<asp:CompareValidator ID="CompareValidator1" runat="server" ControlToCompare="txtCheckOut"
ControlToValidate="txtCheckIn" Operator="LessThanEqual" Type="Date" ForeColor="Red" ErrorMessage="CheckIn Must Be Before CheckOut"
Display="Dynamic" ValidationGroup="a"/>
</div>
<div class="formrow" style="height: auto; margin-top: 20px; width: 430px;">
<asp:GridView ID="gvAddedRooms" runat="server" CssClass="active-grid" AutoGenerateColumns="False"
DataKeyNames="ID" Height="18px" Width="100%" OnRowDeleting="gvAddedRooms_RowDeleting">
<Columns>
<asp:BoundField DataField="ID" HeaderText="ID" />
<asp:BoundField DataField="RoomTypeX" HeaderText="RoomType" />
<asp:BoundField DataField="RoomX" HeaderText="RoomX" />
<asp:BoundField DataField="Rate" HeaderText="Rate" DataFormatString="{0:f}" />
<asp:BoundField DataField="Adults" HeaderText="Adults" />
<asp:BoundField DataField="Children" HeaderText="Children" />
<asp:CommandField ShowDeleteButton="True" />
</Columns>
</asp:GridView>
</div>
<div style="float:left;"> <asp:Label ID="Label1" runat="server" Text="Total Charge : " Font-Bold="true" ForeColor ="Blue" style="font-size:19px;"></asp:Label><asp:Label ID="lblTotalAmount" runat="server" Text=""></asp:Label>
</div>
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="gvAddedRooms" />
<asp:PostBackTrigger ControlID="drpRoomtype" />
<asp:PostBackTrigger ControlID="drpPlan" />
<asp:PostBackTrigger ControlID="lnkAdd" />
<asp:PostBackTrigger ControlID="lstRooms" />
<asp:PostBackTrigger ControlID="drpAdults" />
<asp:PostBackTrigger ControlID="drpChildren" />
<asp:PostBackTrigger ControlID="btnRemoveFilename1" />
</Triggers>
</asp:UpdatePanel>
<%--<div class="formrow" style="text-align: right;">
<asp:UpdatePanel ID="UpdatePanel3" UpdateMode ="Conditional" runat="server">
<ContentTemplate >
Agency :
<asp:DropDownList ID="drpChannel" runat="server" Width="172px" AutoPostBack="True"
Height="32px" >
</asp:DropDownList>
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="drpChannel"
/>
<asp:AsyncPostBackTrigger ControlID="lnkNewChannel" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
<asp:LinkButton ID="lnkNewChannel" runat="server" >New Channel</asp:LinkButton>
</div> --%>
<div class="newsubheadingsearchqueryresults" style="width: 685px;">
<h3>
Customer Details</h3>
<span class="requiredExample">[ * ] = Required Information</span></div>
<div class="formfieldset" style="margin-bottom: 40px;">
<div class="formrow">
<div class="paymentfrmlabels">
Paying Customer :</div>
<div class="paymentfrmtxtbox">
<asp:TextBox ID="txtCustomerName" Width="153px" runat="server"></asp:TextBox>
</div>
<div class="paymentfrmvalidation">
<asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server" ControlToValidate="txtCustomerName"
ErrorMessage="[*]" ValidationExpression="^[a-zA-Z''-'\s]{1,40}$"
ValidationGroup="a" Display="Dynamic"></asp:RegularExpressionValidator>
<asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server" ControlToValidate="txtCustomerName"
ValidationGroup="a" ErrorMessage="[*]" Display="Dynamic"></asp:RequiredFieldValidator>
</div>
</div>
<div class="formrow">
<div class="paymentfrmlabels">
Customer Type :</div>
<div class="paymentfrmtxtbox">
<asp:DropDownList ID="drpCustomerType" Width="153px" runat="server">
<asp:ListItem Text="Person" Value="Person"></asp:ListItem>
<asp:ListItem Text="Company" Value="Company"></asp:ListItem>
</asp:DropDownList>
</div>
</div>
<div class="formrow">
<div class="paymentfrmlabels">
E-Mail :
</div>
<div class="paymentfrmtxtbox">
<asp:TextBox ID="txtEmail" Width="153px" runat="server"></asp:TextBox>
</div>
<div class="paymentfrmvalidation">
</div>
</div>
<div class="formrow">
<div class="paymentfrmlabels">
Phone No :
</div>
<div class="paymentfrmtxtbox">
<asp:TextBox ID="txtPhone" runat="server" Height="23px" Width="153px"></asp:TextBox>
</div>
<div class="paymentfrmvalidation">
<asp:RegularExpressionValidator ID="RegularExpressionValidator4" runat="server" ErrorMessage="Invalid format"
Display="Dynamic" ValidationExpression="^[0-9]*$" ControlToValidate="txtPhone"
ValidationGroup="a"></asp:RegularExpressionValidator>
<asp:RequiredFieldValidator ID="RequiredFieldValidator6" runat="server" ControlToValidate="txtPhone"
Display="Dynamic" ValidationGroup="a" ErrorMessage="[*]"></asp:RequiredFieldValidator>
</div>
</div>
<div class="formrow" style="height: 130px;">
<div class="paymentfrmlabels">
Address:</div>
<div class="paymentfrmtxtbox">
<asp:TextBox ID="txtAddress" runat="server" Height="129px" TextMode="MultiLine" Width="153px"></asp:TextBox>
</div>
</div>
<div class="formrow">
<div class="paymentfrmlabels">
City :</div>
<div class="paymentfrmtxtbox">
<asp:TextBox ID="txtCity" runat="server" Width="153px"></asp:TextBox>
</div>
</div>
<div class="formrow">
<div class="paymentfrmlabels">
Country :</div>
<div class="paymentfrmtxtbox">
<asp:DropDownList ID="drpCountry" Width="153px" runat="server">
</asp:DropDownList>
</div>
</div>
<div class="formrow">
<div class="paymentfrmlabels">
State :</div>
<div class="paymentfrmtxtbox">
<asp:TextBox ID="txtState" Width="153px" runat="server"></asp:TextBox>
</div>
</div>
<div class="formrow">
<div class="paymentfrmlabels">
Postal Code :</div>
<div class="paymentfrmtxtbox">
<asp:TextBox ID="txtPostalCode" Width="153px" runat="server"></asp:TextBox>
</div>
</div>
<div class="formrow" style="height: 90px; width: 670px;">
<div class="paymentfrmlabels">
Other Guest Names :</div>
<div class="paymentfrmtxtbox" style="margin-right:45px;">
<asp:TextBox ID="txtOtherGuest" runat="server" Height="90px" Width="153px" TextMode="MultiLine"></asp:TextBox>
</div>
<div class="paymentfrmlabels">
Other Information:</div>
<div class="paymentfrmtxtbox">
<asp:TextBox ID="txtOtherInf" runat="server" Height="90px" Width="153px" TextMode="MultiLine"></asp:TextBox>
</div>
</div>
<div class="formrow" style="vertical-align: text-top;">
<div class="paymentfrmlabels">
Identity Proof :</div>
</div>
<div class="formrow">
<div class="paymentfrmtxtbox">
</div>
</div>
<div class="formrow" style="text-align: right">
<div class="paymentfrmlabels">
<input id="txtLogoFileName1" type="file" style ="float :left; z-index:999;" name="txtSmallImage1FileName" runat="server" />
<asp:UpdatePanel ID="UpdatePanel2" runat="server" ChildrenAsTriggers ="true" UpdateMode ="Conditional">
<ContentTemplate >
<div class="paymentfrmtxtbox">
<asp:Button ID="btnRemoveFilename1" runat="server" style="margin-left:50px; float :left; z-index:999;" Text="Remove" OnClick="btnRemoveFilename1_Click">
</asp:Button>
</div>
<asp:Label ID="lblLogoFileName1" runat="server" CssClass="labelText" ForeColor="Silver"> </asp:Label>
</div>
</ContentTemplate>
<Triggers >
<asp:PostBackTrigger ControlID ="btnRemoveFilename1" />
</Triggers>
</asp:UpdatePanel>
<div class="formrow" style="width: 300px;">
<div class="paymentfrmtxtbox ">
<asp:UpdatePanel ID="UpdatePanel3" UpdateMode ="Conditional" ChildrenAsTriggers ="true" runat="server">
<ContentTemplate >
Agency:
<asp:DropDownList ID="drpChannel" runat="server" Width="153px" AutoPostBack="True"
style=" float: right; height: 28px; margin-right: 65px;width: 157px;" >
</asp:DropDownList>
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="drpChannel"
/>
<asp:AsyncPostBackTrigger ControlID="lnkNewChannel" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
<asp:LinkButton ID="lnkNewChannel" runat="server" style="display:block; float: right;margin-right: -71px; margin-top: 16px;" >New Channel</asp:LinkButton>
</div>
</div>
</div>
<div class="formrow" style="text-align: right; font-weight:bold; color:#000;">
</div>
<div class="formrow" style="text-align: right; width: 670px;">
<asp:LinkButton ID="lnkSubmit" CssClass="btn" runat="server" OnClick="lnkSubmit_Click1"
Width="65px" ValidationGroup="a">Check In</asp:LinkButton>
<asp:LinkButton ID="lnkCheckout" CssClass="btn" Width="65px" runat="server" OnClick="lnkCheckout_Click"
ValidationGroup="a">Check Out</asp:LinkButton>
<asp:LinkButton ID="lnkCancel" CssClass="btn" Width="65px" runat="server" OnClick="lnkCancel_Click1">Cancel</asp:LinkButton>
</div>
</div>
</div>
<ajaxtoolkit:ModalPopupExtender ID="ModalPopupExtender1" BackgroundCssClass="modalBackground" PopupControlID ="pnlChannel" TargetControlID ="lnkNewChannel" CancelControlID ="ImgBtnClose" runat="server">
</ajaxtoolkit:ModalPopupExtender>
<asp:Panel ID="pnlChannel" runat="server">
<div align="right" style ="padding-top :50px" >
<asp:ImageButton ID="ImgBtnClose" width="25px" Height ="25px" ImageUrl="~/Images/cross.png" runat="server" /></div>
<div style ="background-color:White ; border :20px; border-color:Blue;padding:20px 40px; border-radius:20px;" >
<style type="text/css">
.style1 {
width: 100%;
}
.style2
{
text-align: center;
font-weight: bold;
font-family: Andalus;
font-size: xx-large;
color: #434343;
}
.style3
{
width: 81px;
}
</style>
<div>
<table class="style1">
<tr>
<td class="style2" colspan="2">
Agency</td>
</tr>
<tr><td> </td><td> </td></tr>
<tr><td> </td><td> </td></tr>
<tr>
<td class="style3">
<asp:Label ID="lblName" runat="server" Text="Name:"></asp:Label>
</td>
<td>
<asp:TextBox ID="txtName" runat="server" Width="189px"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator5" runat="server"
ControlToValidate="txtName" Display="Dynamic" ErrorMessage="Mandatory Field!!!"
ForeColor="Red" ValidationGroup="acssd23"></asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="RegularExpressionValidator5" runat="server"
ControlToValidate="txtName" Display="Dynamic"
ErrorMessage="Invalid Name Format!!!" Font-Names="Arial" Font-Size="8pt"
ForeColor="Red" SetFocusOnError="True"
ValidationExpression="^[a-zA-Z-'.\s]{1,50}" ValidationGroup="acssd23"></asp:RegularExpressionValidator>
</td>
</tr>
<tr><td> </td><td> </td></tr>
<tr>
<td class="style3">
<asp:Label ID="lblContact" runat="server" Text="Contact:"></asp:Label>
</td>
<td>
<asp:TextBox ID="txtContact" runat="server" Width="189px"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator7" runat="server"
ControlToValidate="txtContact" Display="Dynamic"
ErrorMessage="Mandatory Field!!!" ForeColor="Red"
ValidationGroup="acssd23"></asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server"
ControlToValidate="txtContact" Display="Dynamic"
ErrorMessage="Invalid Contact Format!!!" ForeColor="Red"
style="font-size: xx-small" ValidationExpression="^[0-9-+]*$"
ValidationGroup="acssd23"></asp:RegularExpressionValidator>
</td>
</tr>
<tr><td> </td><td> </td></tr>
<tr>
<td class="style3">
<asp:Label ID="lblAddress" runat="server" Text="Address:"></asp:Label>
</td>
<td>
<asp:TextBox ID="txtAddresss" runat="server" Height="64px" TextMode="MultiLine"
width="189px"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator8" runat="server"
ControlToValidate="txtAddresss" Display="Dynamic"
ErrorMessage="Mandatory Field!!!" ForeColor="Red"
ValidationGroup="acssd23"></asp:RequiredFieldValidator>
</td>
</tr>
<tr><td> </td><td> </td></tr>
<tr>
<td class="style3">
<asp:Label ID="lblEmail" runat="server" Text="Email:"></asp:Label>
</td>
<td>
<asp:TextBox ID="txtEmails" runat="server" Width="189px"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator9" runat="server"
ControlToValidate="txtEmails" Display="Dynamic"
ErrorMessage="Mandatory Field!!!" ForeColor="Red"
ValidationGroup="acssd23"></asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="RegularExpressionValidator015" runat="server"
ControlToValidate="txtEmail" ErrorMessage="Invalid Email Format!!!"
ForeColor="Red"
ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"
ValidationGroup="acssd23"></asp:RegularExpressionValidator>
</td>
</tr>
<tr><td> </td><td> </td></tr>
<tr>
<td class="style3">
<asp:Label ID="lblWebsite" runat="server" Text="Website:"></asp:Label>
</td>
<td>
<asp:TextBox ID="txtWebsite" runat="server" Width="189px"></asp:TextBox>
</td>
</tr>
<tr><td> </td><td> </td></tr>
<tr>
<td class="style3">
</td>
<td>
</td>
</tr>
<tr>
<td class="style3">
</td>
<td align ="right" >
<asp:Button ID="btnSubmit" CssClass="btn" Width ="140px" runat="server" Text="Submit"
onclick="btnSubmit_Click" style="height: 26px" ValidationGroup="acssd23" />
</td>
</tr>
</table>
</div>
</div>
</asp:Panel>
</asp:Panel>
默认的ASP.NET FileUpload控件永远无法与UpdatePanel一起使用。您需要一个AjaxControl Toolkit中定义的特殊AsyncFileUpload控件。
<ajaxToolkit:AsyncFileUpload OnClientUploadError="uploadError"
OnClientUploadComplete="uploadComplete" runat="server"
ID="AsyncFileUpload1" Width="400px" UploaderStyle="Modern"
UploadingBackColor="#CCFFFF" ThrobberID="myThrobber" />
或您可以使用UpdatePanel触发器
<Triggers>
<asp:PostBackTrigger ControlID="YourControlID" />
</Triggers>
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="true" />
<div>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="conditional">
<Triggers>
<asp:PostBackTrigger ControlID="Button1" />
</Triggers>
<ContentTemplate>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="Button1" runat="server"Text="Upload" OnClick="Button1_Click" />
</ContentTemplate>
</asp:UpdatePanel>
</div>
我今天整个下午都在这里度过，使用在各种论坛上找到的许多解决方案，包括该论坛，CodeProject.com，asp.net论坛以及许多其他论坛。我尝试设置Postback触发器和AsyncPostback触发器，但是深夜我不记得其他所有事情了。他们都不起作用，包括在此页面上标记为答案的一个。我最终发现的是2007年asp.net论坛上的一篇晦涩的帖子，由于某种原因，该帖子现在不会加载到我的浏览器中。无论如何，最终对我有用的是替换
<form id="form1" runat="server>
带有此标签：
<form id="Form1" method="post" enctype="multipart/form-data" runat="server">
做工精美。
就我而言，它位于Site.Master文件中，但如果在forums.asp.net上发布，则它在default.aspx文件中起作用。
更新： forums.asp.net网站已关闭，但现在已备份：UpdatePanel + FileUpload + PostBackTrigger doesn't seem to work。