但是，这个问题有一个解决方法;你需要用javascript来处理它。

解决方案在这里提到：Maintain Scrollbar Position Inside UpdatePanel After Partial PostBack

2012年5月20日编辑看完评论后

<form id="form1" runat="server">
  <asp:ScriptManager ID="ScriptManager1" runat="server" ScriptMode="Release" />
   <script type="text/javascript">
      // It is important to place this JavaScript code after ScriptManager1
      var xPos,yPos;
      var prm = Sys.WebForms.PageRequestManager.getInstance();
 
      function BeginRequestHandler(sender,args) {
        if ($get('<%=Panel1.ClientID%>') != null) {
          // Get X and Y positions of scrollbar before the partial postback
          xPos = $get('<%=Panel1.ClientID%>').scrollLeft;
          yPos = $get('<%=Panel1.ClientID%>').scrollTop;
        }
     }
 
     function EndRequestHandler(sender,args) {
         if ($get('<%=Panel1.ClientID%>') != null) {
           // Set X and Y positions back to the scrollbar
           // after partial postback
           $get('<%=Panel1.ClientID%>').scrollLeft = xPos;
           $get('<%=Panel1.ClientID%>').scrollTop = yPos;
         }
     }
 
     prm.add_beginRequest(BeginRequestHandler);
     prm.add_endRequest(EndRequestHandler);
 </script>
 
 <asp:UpdatePanel ID="UpdatePanel1" runat="server">
   <ContentTemplate>
     <asp:Panel ID="Panel1" runat="server" Height="300">
        <%-- Some stuff which would cause a partial postback goes here --%>
     </asp:Panel>
   </ContentTemplate>
 </asp:UpdatePanel>
 
</form>

以下是代码快照：