Webforms Async call not working RSS

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  sham

  Member

  161 Points

  109 Posts

  Webforms Async call not working

  Apr 27, 2012 03:06 AM|LINK

  Hi Guys,

  Async call is not working in following case.

  Goal: Invoke SSRS reports in child window (javascript popup window) which renders the report in excel format and prompt the user to open/save/cancel dialog box. While child window rendering the report, user can perform other task on main page.

  MainPage--------->calling javascript to open popupwindow --------->childwindow rendering the excel report

  Implementation:

  btnClick event: Tried following 3 ways

   if (System.Web.Configuration.WebConfigurationManager.AppSettings["ReportFormat"].ToString() == "1")
          {
              PageAsyncTask asyncTask = new PageAsyncTask(BeginGetAsyncData, EndGetAsyncData, TimeoutDoSomething, true);
              Page.RegisterAsyncTask(asyncTask);
              Page.ExecuteRegisteredAsyncTasks();
          }

   IAsyncResult BeginGetAsyncData(Object src, EventArgs args, AsyncCallback cb, Object state)
       {
          
           //return myRequest.BeginGetResponse(cb, state);
           _dlgt = new AsyncTaskDelegate(DoTheAsyncTask);
           IAsyncResult result = _dlgt.BeginInvoke(cb, state);
           return result;

       }

       void EndGetAsyncData(IAsyncResult ar)
       {
           //System.Net.WebResponse myResponse = myRequest.EndGetResponse(ar);
           //myResponse.Close();
           _dlgt.EndInvoke(ar);
       }

  
        ------------------------------------------------------------------------------------------------ 
   if (System.Web.Configuration.WebConfigurationManager.AppSettings["ReportFormat"].ToString() == "3")
          {
              var taskSSRS = new Task(() => DoTheAsyncTask());
              taskSSRS.Start();
          }
        ----------------------------------------------------------------------------------------------------- 
   if (System.Web.Configuration.WebConfigurationManager.AppSettings["ReportFormat"].ToString() == "4")
          {
              var outer = Task.Factory.StartNew(() =>
              {
                  var child = Task.Factory.StartNew(() =>
                  {
                      DoTheAsyncTask();
                  });

              });

           outer.wait();
          }

  DoTheAsynTask() method calls following javascript:
  age.ClientScript.RegisterStartupScript(this.GetType(), "callReport", "javascript:callSSRSReport('" + reportURL + "');", true);

  Javascript:
  function callSSRSReport(reportURL) {
          var childWin = window.open("EExport.aspx?ReportName=" + reportURL, "ssrs", "width=250, height=150, menubar=no,toolbar=no, statusbar=no, resizable=yes, scrollbars=yes, location=no");
      }

  
  EExport.aspx:
  This page using the ReportViewer control to render and display the excel open/save/cancel dialog box to the user.

  Problem:
  After invoking the SSRS report (popup window) through javascript, Main page seems like idle but when I perform any other task Main page is not responding until the popup screen done with rendering the report. This is defeating the purpose of having implementing SSRS report in our application. Also I tried calling the report directly from Main page (without using popup), with this option if control move to different page excel dialog box not appearing. 

  Please let me know what is going wrong with this code.

  Thanks

  Sham