Sys.WebForms.PageRequestManagerParserErrorException的解决方法

 在使用UpdatePanel的时候,如果要用到Response.Write()方法,则会出错,错误信息内容大概如下:
Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled. Details: Error parsing near ' 你要输出的内容|UpdatePanel|U'

解决方法如下:

 1.如果调用Response.Write()方法的服务器控件在使用UpdatePanel的页面,则只需要在UpdatePanel下增加一个<Triggers>节点,通过PostBackTrigger注册一下改控件就可以了。代码如下:

  1. <asp:ScriptManager ID="ScriptManager1" runat="server">
  2.         </asp:ScriptManager>
  3.         <asp:UpdatePanel ID="UpdatePanel1" runat="server">
  4.             <Triggers>
  5.                     <asp:PostBackTrigger ControlID="Button2" />    <!--Button2就是下面那个需要在Button2_Click事件里使用Response.Write()的按钮ID-->
  6.             </Triggers>
  7.             <ContentTemplate>            
  8.                 <asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="Button" />
  9.                 <asp:UpdateProgress ID="UpdateProgress1" runat="server">
  10.                 <ProgressTemplate></ProgressTemplate>
  11.                 </asp:UpdateProgress>
  12.             </ContentTemplate>
  13.         </asp:UpdatePanel>

2.但是,如果是在母版页中使用UpdatePanel,则不能通过以上方法来解决,否则或出现类似以下错误:

A control with ID 'btnExport' could not be found for the trigger in UpdatePanel 'UpdatePanel1'.

这主要是UpdatePanel1找不到<asp:PostBackTrigger ControlID="btnExport" />中注册的控件,因为,我们一般没有在母版页中添加这个控件(btnExport)。(当然,如果在UpdatePanel的<ContentTemplate>  节点下添加了ID为btnExport的控件,则不会出错。)

如果出现这样的错误该怎么办呢,我的解决方法是在需要用到Response.Write()方法的控件所在页码的Page_Load事件中添加如下代码:

((ScriptManager)Master.FindControl("ScriptManager1")).RegisterPostBackControl(btnExport); 
//ScriptManager1是<asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager>的ID
这样,问题就解决了。
 
下面是我的一个项目中的代码:
母版页前台代码:
  1. <asp:ScriptManager runat="server" ID="ScriptManager1">
  2. </asp:ScriptManager>
  3. <asp:UpdatePanel ID="UpdatePanel1" runat="server">
  4.           <ContentTemplate>
  5.                             <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">                               
  6.                             </asp:ContentPlaceHolder>
  7.                             <asp:UpdateProgress ID="UpdateProgress1" runat="server">
  8.                                 <ProgressTemplate>
  9.                                     <table class="progressBox" style="width: 200px">
  10.                                         <tr>
  11.                                             <td>
  12.                                                 <asp:Image runat="server" ID="imgLoad" ImageUrl="~/App_Themes/SkinFile/Images/animated_loading.gif" />
  13.                                             </td>
  14.                                             <td>
  15.                                                 正在从服务器下载数据...
  16.                                             </td>
  17.                                         </tr>
  18.                                     </table>
  19.                          </ProgressTemplate>
  20.                    </asp:UpdateProgress>
  21.          </ContentTemplate>
  22. <asp:UpdatePanel>
子页面后台代码:
  1. protected void Page_Load(object sender, EventArgs e)
  2.     {
  3.         ((ScriptManager)Master.FindControl("ScriptManager1")).RegisterPostBackControl(btnExport);
  4.     }
这样,当按钮btnExport的单击事件中用到:Response.Write()方法时,就不会出现题目中的错误了。

 

你可能感兴趣的:(server,服务器,asp,button,triggers,Parsing)