StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POClosing a rendering report from ReportViewer sometimes hangs application
text
Body
copied!<p>I am having an issue when trying to close a report that is still rendering in the ReportViewer inside a VB.NET application. When I try to close the still rendering report (report with over 600 pages) it will SOMETIMES seemingly close the report but hang the entire application (inclusing the minimize/maximise functions) but still show it as "Running" in task manager. </p> <p>I have implemented the <code>CancelRendering</code> Function but this seems to only help in situations where the report was going to close properly in the first place. I have tried all sorts of different values for the timeout including "-1" and "0" but nothing makes a difference. The only constant thing with this error is when the report hangs the application the <code>CancelRendering</code> returns "<code>False</code>". </p> <p>Here is a snippet of the ReportBase class that is runnning the WinForms.ReportViewer:</p> <pre><code>Private Sub ReportBase_FormClosed(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosedEventArgs) Handles Me.FormClosed Dim parent As MainForm parent = Me.ParentForm ' Get the parent form of this child ' If there is only one child left and this child is closing then show the explorer bar If parent.MdiChildren.GetLength(0) = 1 Then parent.UltraExplorerBar1.Show() parent.HomeToolStripMenuItem.Visible = False MainForm.Panel2.Visible = True End If End Sub Private Sub ReportBase_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing Dim millisecondsTimeout As Integer = 100 'waits for the report to cancel rendering Dim returnValue As Boolean returnValue = ReportViewer2.CancelRendering(millisecondsTimeout) MessageBox.Show(returnValue.ToString) End Sub Private Sub ReportBase_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load With ReportViewer2 'Get reports from remote server .ProcessingMode = Microsoft.Reporting.WinForms.ProcessingMode.Remote .ServerReport.ReportServerUrl = New System.Uri(ReportServer) End With End Sub </code></pre> <p><strong>EDIT 1:</strong> Something I forgot to mention. I checked my threads and the "Rendering" thread remaind open when the report hangs my application. </p> <p>Also when CancelRendering is set to "-1" the report never closes. The application just hangs with the report still open.</p> <p><strong>EDIT 2:</strong> This is only happening when I open the report in "<code>Printlayout</code>" aka <code>ReportViewer.SetDisplayMode(Microsoft.Reporting.WinForms.DisplayMode.PrintLayout)</code>. When the report is opened normally it loads all 413 pages in an instant. When loaded in "<code>PrintLayout</code>" the report loads each page (over 600 in this mode) one by one very slowly. I think it has something to do with exiting the thread that is loading each of these pages. </p> <p>I could not get the error when loading into the regular mode.</p> <p>I would run a profiler session on the report server but unfortunatly I do not have access at this time. If I do gain access I will update with the results.</p> <p><strong>EDIT 3:</strong> When the report closes correctly (and the CancelRendering works properly) I get "Report processing was cancelled" and <code>CancelRendering</code> returns true</p> <p><img src="https://i.stack.imgur.com/j3o8t.png" alt="works"></p> <p>When the report does not stop rendering before closing, it keeps rendering after the <code>CancelRendering</code> fires and returns a False.</p> <p><img src="https://i.stack.imgur.com/uDyVX.png" alt="does not work"></p> <p>Another thing I discovered is that if I close the entire application instead of just the report, The application will close but stay open only as a process in Task Manager. this makes me think it really is a issue closing the Render thread. The threads also do not have locations when the application is hanging.</p> <p><img src="https://i.stack.imgur.com/Hh1kv.png" alt="threads"></p>

Querying!

Guidance

An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload