我有两个 UpdatePanel，一个 UpdatePanel 包含 Grid，另一个包含数据条目。当用户单击 GridView 中的 ImageButton 时，它将显示给 ModalPopupExtender 并显示第二个 UpdatePanel。当用户将数据输入到第二个 UpdatePanel 下的字段中时，如果他们单击按钮报告或按钮取消，我将在两个按钮上强制回发。问题是，如果用户返回并单击页面上的不同行，则未清除 UpdatePanel2 下的所有数据单击的第一行中的所有数据...我尝试过 UpdatePanel1.Update()，UpdatePanel2.Update( ) 整页 PostBack 没有任何作用。唯一有效的方法是如果我将 Response.Redirect 返回到自身。但我试图避免这样做，并试图避免使用 .cs 代码将字段清除为空。想知道是否有办法回发并清除 UpdatePanel2 下的所有字段。提前感谢您的帮助。
<asp:UpdatePanel ID="upGrid" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<div>
<span id="lblTab" runat="server" style=" font-weight:bold; font-size:larger">All Published Reports</span>
<br />
<asp:GridView
ID="gvReports"
runat="server"
CssClass="gridview"
RowStyle-CssClass="gridview_itm"
AlternatingRowStyle-CssClass="gridview_aitm"
HeaderStyle-CssClass="gridview_hdr"
PagerStyle-CssClass="gridview_pgr"
AutoGenerateColumns="False"
Width="100%" onrowcommand="gvReports_RowCommand">
<Columns>
<asp:TemplateField HeaderText="Name">
<ItemTemplate>
<asp:LinkButton ID="btnReport" runat="server" CommandName="Report" CommandArgument='<%#Eval("n_ReportFileName")%>' Text='<%#Eval("n_Name")%>' CausesValidation="false"></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Name">
<ItemTemplate>
<%#Eval("n_Description")%>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:ModalPopupExtender ID="ModalPopupExtender1" runat="server" TargetControlID="Button1" PopupControlID="ReportParameterPanel" BackgroundCssClass="modalBackground" DropShadow="True">
</asp:ModalPopupExtender>
<asp:Button ID="Button1" runat="server" Text="Button" style="visibility:hidden"/>
<asp:Panel ID="ReportParameterPanel" runat="server" Height="375px"
Width="700px" BackColor="#f4de90"
HorizontalAlign="Center" BorderColor="#666666" BorderStyle="Outset"
BorderWidth="5px">
<table style="height: 50px; width: 685px; text-align: left">
<span id="lblReportName" runat="server" style="font-weight:bold; font-size:larger"></span>
<tr>
<td align="left" style="padding-left: 5px; width: 335px;" valign="top">
<span id="StarDateStar" runat="server" style="color: Red">*Optional </span><span id="lblStartDate" runat="server">Start Date: </span>
<asp:TextBox ID="tbStartDate" runat="server"></asp:TextBox>
<asp:ImageButton ID="imgCalendar" runat="server" ImageUrl="~/App_Themes/Sugar2006/images/Calendar_scheduleHS.png" ImageAlign="Middle" />
<asp:CalendarExtender ID="ceStartDate" runat="server" TargetControlID ="tbStartDate" PopupButtonID="imgCalendar" />
<asp:MaskedEditExtender ID="mexStartDate" runat="server"
TargetControlID="tbStartDate"
Mask="99/99/9999"
MaskType="Date"
MessageValidatorTip="true"
OnFocusCssClass="MaskedEditFocus"
OnInvalidCssClass="MaskedEditError" />
<br />
<asp:MaskedEditValidator ID="mevStartDate" runat="server"
ControlToValidate="tbStartDate"
ControlExtender="mexStartDate"
Display="Dynamic"
InvalidValueMessage="This date is invalid!" Font-Bold="True"
ForeColor="#D50000" ValidationGroup="vgMyGroup" />
</td>
<td align="left" style="padding-right: 5px; padding-bottom: 5px; width: 350px;" valign="top">
<span id="EndDateStar" runat="server" style="color: Red">*Optional </span><span id="lblEndDate" runat="server">End Date: </span>
<asp:TextBox ID="tbEndDate" runat="server"></asp:TextBox>
<asp:ImageButton ID="imgCalendar2" runat="server" ImageUrl="~/App_Themes/Sugar2006/images/Calendar_scheduleHS.png" ImageAlign="Middle" />
<asp:CalendarExtender ID="ceEndDate" runat="server" TargetControlID ="tbEndDate" PopupButtonID="imgCalendar2" />
<asp:MaskedEditExtender ID="mexEndDate" runat="server"
TargetControlID="tbEndDate"
Mask="99/99/9999"
MaskType="Date"
MessageValidatorTip="true"
OnFocusCssClass="MaskedEditFocus"
OnInvalidCssClass="MaskedEditError" />
<br />
<asp:MaskedEditValidator ID="mevEndDate" runat="server"
ControlToValidate="tbEndDate"
ControlExtender="mexEndDate"
Display="Dynamic"
InvalidValueMessage="This date is invalid!" Font-Bold="True"
ForeColor="#D50000"
ValidationGroup="vgMyGroup" />
</td>
</tr>
</table>
<table style="height: 25px; width: 685px; text-align: left">
<tr>
<td align="left" style="padding-left: 5px; width: 335px;" valign="top">
<span id="lblOperator" runat="server">Operator:</span>
<asp:DropDownList ID="Parameters" runat="server" style="margin-left: 73px">
<asp:ListItem Selected="True"><</asp:ListItem>
<asp:ListItem>></asp:ListItem>
<asp:ListItem>=</asp:ListItem>
<asp:ListItem>Completed</asp:ListItem>
<asp:ListItem>Not Completed</asp:ListItem>
</asp:DropDownList>
</td>
</tr>
</table>
<asp:RadioButtonList ID="GroupingList" runat="server" Height="25px"
RepeatDirection="Horizontal"
AutoPostBack="true" onselectedindexchanged="GroupingList_SelectedIndexChanged"
CausesValidation="true" ValidationGroup="vgMyGroup" />
<table style="height: 25px; width: 685px; text-align: left">
<tr id="rowEntitySelectionLabels" runat="server">
<td style="padding-left: 3px; height: 16px; width: 300px;">
<asp:Label ID="GroupItemInputLabel" runat="server" />
</td>
<td style="height: 16px; width: 48px;">
</td>
<td style="height: 16px; width: 300px;">
<asp:Label ID="GroupItemsListInputLabel" runat="server" />
</td>
</tr>
<tr id="rowEntitySelections" runat="server">
<td valign="top" style="padding-left: 3px; height: 100px; width: 300px;">
<asp:ListBox ID="GroupItemInput" runat="server" Width="300px" Height="150px"
SelectionMode="multiple" BackColor="White" ForeColor="Black" />
</td>
<td align="center" valign="top" style="height: 100px; width: 50px;">
<br />
<asp:ImageButton ID="btnAddItem"
ImageUrl="~/App_Themes/Sugar2006/images/Actions-arrow-right-icon.png" runat="server"
OnClick="btnAddItem_Click" Height="18px" Width="25px"
ToolTip="Adds the Selected <Item>." CausesValidation="true" ValidationGroup="vgMyGroup" /><br />
<asp:ImageButton ID="btnAddAllItems"
ImageUrl="~/App_Themes/Sugar2006/images/Actions-arrow-right-double-icon.png" runat="server"
OnClick="btnAddAllItems_Click" Height="18px" Width="25px"
ToolTip="Adds all of the <Items>." CausesValidation="true" ValidationGroup="vgMyGroup" /><br />
<br /><br />
<asp:ImageButton ID="btnRemoveItem"
ImageUrl="~/App_Themes/Sugar2006/images/Actions-arrow-left-icon.png" runat="server"
OnClick="btnRemoveItem_Click" Height="18px" Width="25px"
ToolTip="Removes the Selected <Item>." CausesValidation="true" ValidationGroup="vgMyGroup" /><br />
<asp:ImageButton ID="btnRemoveAllItems"
ImageUrl="~/App_Themes/Sugar2006/images/Actions-arrow-left-double-icon.png" runat="server"
OnClick="btnRemoveAllItems_Click" Height="18px" Width="25px"
ToolTip="Removes all of the <Items>." CausesValidation="true" ValidationGroup="vgMyGroup" />
</td>
<td valign="top" style="height: 100px; width: 300px;" id="TD1">
<asp:ListBox ID="GroupItemsList" runat="server" Width="300px" Height="150px"
SelectionMode="multiple" BackColor="White" ForeColor="Black" />
</td>
</tr>
</table>
<asp:Button ID="btnClose" runat="server" Text="Close" CssClass="btn" onclick="btnClose_Click" CausesValidation="false" />
<asp:Button ID="btnSend" runat="server" Text="Report" CssClass="btn" OnClick="btnSend_Click" Enabled="false" CausesValidation="true" ValidationGroup="vgMyGroup" />
</asp:Panel>
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="btnSend" />
<asp:PostBackTrigger ControlID="btnClose" />
</Triggers>
</asp:UpdatePanel>
</div>
</ContentTemplate>
</asp:UpdatePanel>