使用UpdatePanel從UserControl下載文件

Question

我有一個用戶控件定義如下。

 <asp:UpdatePanel ID="UpdatePanel1" runat="server"> 
     <ContentTemplate> 
      <table> 
       <tr> 
        <td> 
         <asp:ImageButton ID="ImageButton" runat="server" /> 
        </td> 
        <td> 
         <asp:Label ID="lblHeader" runat="server" Text=""></asp:Label> 
        </td> 
       </tr> 
      </table> 
      <asp:Button runat="server" ID="saveLayoutBtn" Text="Save" OnClick="SaveBtn_Click" 
       ToolTip="Save current grid layout" /> 
      <asp:Button ID="Home_ExportExcel" runat="server" Text="Export To Excel" OnClick="Home_ExportExcel_Click" Visible="false" /> 
      <asp:PlaceHolder ID="placeHolder" runat="server"></asp:PlaceHolder> 
      <asp:Label ID="notificationLbl" runat="server" Text="" Font-Bold="true"></asp:Label> 
      <div id="DataGridWrapper"> 
<!--A Grid View tat displays Data--> 
    </div> 
    </ContentTemplate> 
    </asp:UpdatePanel> 

現在，被點擊的Home_ExportExcel的時候，我想GridDtata要導出爲Excel/xml文件。 我在usercontrol.ascx.cs

protected void Home_ExportExcel_Click(object sender, EventArgs args) 
     { 
GenerateWorkSheetWithSB(resultTbl, this.MasterPage.CurrentLibrary); 
     } 
public void GenerateWorkSheetWithSB(DataTable resultRequests, string libName, string advancedSearch = null) 
     { 
      WindowsImpersonationContext impersonationContext; 
      if (BLSecurity.ImpersonateFacelessAccount(out impersonationContext)) 
      { 
       int iWorkSheet = 1, iCol = 1, iRow = 1; 
       System.Text.StringBuilder strExcelXml = new System.Text.StringBuilder(); 
       try 
       { 
        iWorkSheet = 1; 
        iCol = 15; 
        iRow = resultRequests.Rows.Count + 1; 
        iWorkSheet++; 
        iRow++; 
        iCol++; 
       } 
       catch (Exception ex) 
       { 

       } 

       //First Write the Excel Header 
       strExcelXml.Append(ExcelHeader()); 
       // Get all the Styles 
       strExcelXml.Append(ExcelStyles()); 
       // Worksheet options Required only one time 
       strExcelXml.Append(ExcelWorkSheetOptions()); 

       for (int i = 1; i < iWorkSheet; i++) 
       { 
        // Create First Worksheet tag 
        strExcelXml.Append("<Worksheet ss:Name=\"WorkSheet" + i.ToString() + "\">"); 
        // Then Table Tag 
        strExcelXml.Append("<Table ss:DefaultColumnWidth=\"150\" >"); 


         SetupExcelHeaderWorksheet(strExcelXml, libName); 
         foreach (DataRow row in resultRequests.Rows) 
         //foreach (DataRow row in resultRequests.Rows) 
         SetupExcelDataWorksheet(strExcelXml, row, libName); 
        strExcelXml.Append("</Table>"); 
        strExcelXml.Append("</Worksheet>"); 
       } 
       // Close the Workbook tag (in Excel header you can see the Workbook tag) 
       strExcelXml.Append("</Workbook>\n"); 

       #region "Write Into File" 
       string uploadTempPath = "D:"; //ProfileBroker.GetProfileValue(AppProfileConst.UPLOAD_SERVER_TEMPPATH); 
       string tmpFilePath = uploadTempPath + "\\HomeGridData.xml"; 
       string convertData = ConvertHTMLToExcelXML(strExcelXml.ToString()); 
       byte[] byteArray = Encoding.UTF8.GetBytes(convertData); 
       //MemoryStream stream = new MemoryStream(byteArray); 
       File.WriteAllBytes(tmpFilePath, byteArray); 

       //this.Page.Response.Buffer = true; 
       this.Page.Response.Clear(); 
       this.Page.Response.AddHeader("content-disposition", "attachment; filename=" + Path.GetFileName(tmpFilePath)); 
       this.Page.Response.ContentType = "application/octet-stream"; 
       this.Page.Response.TransmitFile(tmpFilePath); //does not work inside WARP unless there is JS, refer to ascx file 
       this.Page.Response.End(); 
       #endregion 
       SecurityUtils.UndoImpersonation(impersonationContext); 

      } 
      else 
      { 
       Response.Write("<script>alert('File does not exist. Please contact tool support.')</script>"); 
      } 
     } 

我沒有得到任何文件下載下面的代碼，而不是我得到的網格數據作爲http響應XML格式。 如果我在.aspx頁面上使用相同的代碼，它工作正常，文件被下載。 我在SO上發現了this和this，發現使用UpdatePanel可能是個問題。但我不確定我在這裏錯過了什麼。

Answer 1

要下載你需要回發試試這個

<asp:UpdatePanel ID="UpdatePanel1" runat="server"> 
    <ContentTemplate> 
     <table> 
      <tr> 
       <td> 
        <asp:ImageButton ID="ImageButton" runat="server" /> 
       </td> 
       <td> 
        <asp:Label ID="lblHeader" runat="server" Text=""></asp:Label> 
       </td> 
      </tr> 
     </table> 
     <asp:Button runat="server" ID="saveLayoutBtn" Text="Save" OnClick="SaveBtn_Click" 
      ToolTip="Save current grid layout" /> 
     <asp:Button ID="Home_ExportExcel" runat="server" Text="Export To Excel" OnClick="Home_ExportExcel_Click" Visible="false" /> 
     <asp:PlaceHolder ID="placeHolder" runat="server"></asp:PlaceHolder> 
     <asp:Label ID="notificationLbl" runat="server" Text="" Font-Bold="true"></asp:Label> 
     <div id="DataGridWrapper"> 
<!--A Grid View tat displays Data--> 
</div> 
</ContentTemplate> 
<Triggers> 
    <asp:PostBackTrigger ControlID="Home_ExportExcel" /> 
    </Triggers> 
</asp:UpdatePanel>