Under Review
Last Updated: 05 Apr 2024 08:39 by ADMIN

Using the November 2023 Report Designer, when a resize a Panel and then press Ctrl-Z to undo the resize, all objects within the Panel are lost.

I was able to confirm this by saving as a second copy and then comparing the XML between them.

Under Review
Last Updated: 01 Apr 2024 09:46 by ADMIN

Currently the Webdesigner makes up to 6(?) and the Standalone Designer as much as it needs without(?) limit.

Especially the latter case can quickly lead to a lot of connections, saturating the max allowed connections of a sql server, which also leads to other services depending on a sql server connection to fail.

As far as I've seen, this only happens with Charts in Design mode.

So there are multiple ways to handle this:

  • Being able to specify the max concurrent connections in the designer
  • Make the usage of the DataSource more efficient by only loading the data once (like in the report viewer)
  • Being able to turn off the chart preview in the Designer (By configuration, not with a user settable option)

See the attached report for a simple example:

It contains a single Datasource, which is a postgres query which simply waits 10s before returning the result.
After updating the DataSource to something which works for you and saving, simply reopen the report and see how many connections are opened in parallel.

With kind regards
Dominik Rothert

Under Review
Last Updated: 27 Dec 2023 09:46 by ADMIN
When a Report Parameter is send via REST or the CreateDocument, and there is a list of values defined in the Report, if the Value isn't found in the list (case matching) a message like "parameter doesn't exist in the list content" (or something similar) would be much more helpful than the same "missing or invalid parameter" that is returned when indeed, a parameter that is required was not passed in.
Under Review
Last Updated: 16 Oct 2023 08:46 by ADMIN
Created by: NPL IT
Comments: 1
Type: Feature Request
When you preview a Telerik report the report automatically saves.  Unlike Visual Studio, PowerPivot, SSRS, etc.. a preview in Telerik reporting overwrites your vetted production report with all uncommitted changes.  This has cost us significant time and headaches.  There are very good reasons every other piece of software in the world decouples preview from save.  Is there any reason Telerik reporting behaves in a way that makes it easier than other software products to commit flawed changes to production files?
Under Review
Last Updated: 26 Sep 2022 09:37 by ADMIN


I have a problem with report generating. We use HTML5 report viewer and basic implementation of ReportsControllerBase on server.
I've noticed that we have the CPU/memory recourse consumption after immediately pressing Stop Rendering button. The time of consumption recourses is the same as time without cancelling(about 18-20 second in my example)
There is log with calls of report generating. Last one with cancelling, previous without. 
*** ReportProcessor.ProcessReport DONE in 00:00:16.1918150 ***
*** ReportProcessor.ProcessReport DONE in 00:00:16.8522950 ***)

I've investigated how cancelation is working.
The Stop Rendering button send DELETE request to ReportsControllerBase.DeleteReport endpoint. It does something and set IsDeleted flag for document.
Then DocumentCancellationController.ThrowIfCancellationRequested() is called in some specific places in app. You can see that method in log.txt, so it was called after pushing the button.

I've profiled the hot path of generation of report. See hotpath.png.
The most CPU intensive work happens in ReportProcessor.ProcessRepourtSource()...
Pay attention to rendering calls.png - the first red dot here - ReportProcessor.ProcessRepourtSource() call.
The second - where the exception and actual cancelation happens.
I'm expecting it should happen much earlier and cancellation of generation of document(and resources consumption) will finish ASAP.

By the way, I see some cancelation checks in ReportProcessor.ProcessRepourtSource() as well - see throwIfCancellation.png
But cancelation request came after these check and most intensive CPU works already started.

Is it possible to fix that?

Under Review
Last Updated: 15 Aug 2022 15:41 by ADMIN

I display the WPF Report Viewer control in a closable tab. To free the resources I invoke DisposeViewerResources on tab close as described here: https://docs.telerik.com/reporting/embedding-reports/display-reports-in-applications/wpf-application/disposing-the-report-viewer-resources

However, I see the following dialog every time. There is no way to capture this error or suppress the dialog.

Under Review
Last Updated: 09 Aug 2022 14:24 by ADMIN
Created by: Stewart
Comments: 1
Type: Feature Request

I am currently investigating including the Telerik Reports in our products but when I load the Web Report Designer it loads a theme which is overwriting our custom theme. 

Is there any way to prevent this so that we keep our custom theme?

Under Review
Last Updated: 08 Jun 2022 08:05 by ADMIN
Created by: Patrick
Comments: 1
Type: Feature Request


It would be necessary to have a way to export a sub-report to a trdx file with the designer. Also, the same tool could be used to import a sub-report into an XML source. Currently, it takes a lot of acrobatics to be able to do this work.

Thank you for your help!

Under Review
Last Updated: 06 Apr 2022 10:34 by ADMIN

Please add DropDownTree and/or TreeView as single- and multi-value parameter editors to accommodate Hierarchical data. It would be nice to have them out-of-the-box when available values come from a hierarchical/self-referencing table(s), but I would be happy if they could be integrated as Custom Parameter Editors. I was able to render and populate the dropdowntree with checkboxes, pass the correct selected values, but the 'Preview' button would never enable upon selection. Also, the dropdowntree's AutoClose(false) was not recognized. I know this can be achieved outside of the report viewer, but sometimes that method disrupts the layout and flow of the reporting view.


Under Review
Last Updated: 04 Feb 2022 09:39 by ADMIN
Unable to get report parameters.
An error has occurred.
Type: Telerik.Reporting.ReportSerialization.Current.ReportSerializable`1[Telerik.Reporting.Report]
Under Review
Last Updated: 09 Dec 2021 08:38 by ADMIN
Created by: Cedric
Comments: 1
Type: Bug Report

I am using the stand alone report designer, connected to a report server.
In the report I am designing, I have several cross tabs. We now want to create the same crosstabs, with additional filtering for the data.

- I copy the existing crosstab, then paste it.

Both cross tabs now reference the SAME row groups. Because of this, when I edit the filters, it just doesn't work. Looks like there are reference issues when the copy / paste is done, not all the objects within the cross tab are getting a new copy.


Original crosstab - it has a row group called "groupName1" :


Copied crosstab - same "groupName1" row group - it shouldn't be the same row group object.

Under Review
Last Updated: 23 Jul 2021 11:52 by ADMIN

I would like to be able to access the report template layout using the ref so that I can save the report template outside of the designer.  Similar to this:


<button type="button"class="btn btn-light btn-sm" @onclick="Save">Save</button> <WebReportDesigner @ref="designer1" DesignerId="wrd1" ServiceUrl="/api/reportdesigner" Report="Dashboard.trdp" ToolboxArea="new ToolboxAreaOptions() { Layout = ToolboxAreaLayout.Grid }" PropertiesArea="new PropertiesAreaOptions() { Layout = PropertiesAreaLayout.Categorized }" /> @code { WebReportDesigner designer1; void Test() { var layout = (byte)designer1.Report.Layout;

} }

Under Review
Last Updated: 28 Jun 2021 09:10 by ADMIN
Created by: Frantisek
Comments: 11
Type: Bug Report



I have problem with visual studio auto close when I'm working in reporting designer.

When I'm working in reporting designer and do about 5 changes, Visual studio freezes and after few monents is restarted and I loose all my work.

It is really frequented problem and I can hardly work with reporting designer.


In Windows Event Viewer I everytime find this exception that referes to problem in GetAggregateFunctions().

Application: devenv.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.NullReferenceException

Server stack trace: 
   at Telerik.Reporting.Processing.AggregateFunctionHelper.GetAggregateFunctions(IServiceProvider provider)
   at Telerik.Reporting.Design.Common.ExpressionBuilder.CategoryAdapter.<GetAggregates>d__1b.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at Telerik.Reporting.Design.Common.ExpressionBuilder.CategoryAdapter.FillAggregates(Category funcCategory, IServiceProvider provider)
   at Telerik.Reporting.Design.Common.ExpressionBuilder.CategoryAdapter.CreateHierarchy(IServiceProvider provider, Boolean isFieldsTreeVisible)
   at Telerik.Reporting.Design.Common.ExpressionBuilder.ExpressionBuilderDialog.LoadCategories(IServiceProvider provider)
   at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
   at System.Runtime.Remoting.Messaging.StackBuilderSink.AsyncProcessMessage(IMessage msg, IMessageSink replySink)
   at System.Runtime.Remoting.Proxies.RealProxy.EndInvokeHelper(System.Runtime.Remoting.Messaging.Message, Boolean)
   at System.Runtime.Remoting.Proxies.RemotingProxy.Invoke(System.Object, System.Runtime.Remoting.Proxies.MessageData ByRef)
   at Telerik.Reporting.Design.Common.ExpressionBuilder.ExpressionBuilderDialog+LoadCategoriesDelegate.EndInvoke(System.IAsyncResult)
   at Telerik.Reporting.Design.Common.ExpressionBuilder.ExpressionBuilderDialog.OnLoadCategoriesComplete(System.IAsyncResult)
   at System.Runtime.Remoting.Messaging.AsyncResult.SyncProcessMessage(System.Runtime.Remoting.Messaging.IMessage)
   at System.Runtime.Remoting.Messaging.StackBuilderSink.AsyncProcessMessage(System.Runtime.Remoting.Messaging.IMessage, System.Runtime.Remoting.Messaging.IMessageSink)
   at System.Runtime.Remoting.Proxies.AgileAsyncWorkerItem.DoAsyncCall()
   at System.Runtime.Remoting.Proxies.AgileAsyncWorkerItem.ThreadPoolCallBack(System.Object)
   at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(System.Object)
   at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
   at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()

Under Review
Last Updated: 05 May 2021 11:43 by ADMIN
Created by: Yudith
Comments: 1
Type: Feature Request

Hi Telerik Team,


I am using telerik reporting watermark to put some "design" in our report template for all the pages, but a small image with a size of 50kb as watermark generates additional 200-300MB of memory usage during the rendering of the report.


Please reduce the memory consumption since this behavior limits the number of user that can access the report simultaneously



Under Review
Last Updated: 29 Apr 2021 10:59 by ADMIN

Dear Telerik,

We use Azure App Services to host the reporting engine API.

Azure App Services validate all incoming requests to ensure they come in with valid Bearer JWT tokens. Your suggested workaround of validating the tokens only on some requests in the application would require us to turn off built-in Azure validation, which elevates security risks.

Can you please ensure [authenticationToken] is added to ALL requests from the Angular tr-viewer to the API, not just some requests?

Please redesign the viewer to authenticate all its requests to the backend service. Including but not limited to the requests report viewer makes to download generated report documents as attachments by performing get document requests through window.open() or any other methods.

We appreciate your efforts to obfuscate such requests; however, these efforts need to be in addition and not instead of industry standard security practices.

Thank you very much,

Sergey Nosov
Sr. Integrator/Developer,
Calpine Energy Solutions

Under Review
Last Updated: 26 Mar 2021 16:36 by ADMIN
I have a requirement for my report book to feature a title page and *THEN* a table of contents for the report book, followed by the report book's content. Currently, the TOC for a report book can only go at the beginning or the end of the book. My requirement required the ability to specify the TOC position more generally.
Here are two possible approaches:

1. Implement the requirement as it is stated by allowing the report book's TOC to be positioned after such and such a report - the nth, or some other means of identification.
2. Honour the TOC for a report book that is nested inside another. I created a 'sub book' with the TOC as its first page and then added this an outer book. Unfortunately, the inner book's TOC was not honoured and the report was skipped.

To my mind, the second suggestion above feels easier to implement (but I am guessing, of course). It certainly would allow just about any combination.
Under Review
Last Updated: 18 Feb 2021 10:31 by ADMIN
after report viewer load , picture box is giving error internal server error .

i figure out the issue that my api is crash due to header is missing in this url .

kindly suggest me what should i do to resolve this issue  , how to add header in giving api 


Under Review
Last Updated: 17 Feb 2021 13:38 by ADMIN

I am currently using Reporting
The following error occurred while using Reporting.

'Non-Error promise rejection captured with value: Error shown. Throwing promises chain stop error.'

I looked up the cause of this error, and I was able to confirm the following article.


As explained in the above article, the error in Report Server ( has been corrected to appear to be a significant error.

So I looked up the release note to see if this error was fixed in the Reporting product, but I couldn't find any related information.

Is this error corrected on the Report Server only and not corrected in Reporting? If so, when can it be revised?

Under Review
Last Updated: 03 Dec 2020 09:56 by ADMIN
Created by: Heiko
Comments: 1
Type: Bug Report

The SearchDialog is placed based upon a parent window of type "Window". However, when I use other types like "RadRibbonWindow" as my main window the placement does not work correct. As a result the SearchDialog is shown in the upper right corner of the desktop. This is the code (in SearchDialogController.cs):

        Window GetParentWindow()
            return (this.model.PageScrollViewer == null)
                ? null
                : this.model.PageScrollViewer.FirstParentOfType<Window>();

At least this method should also take RadRibbonWindow in account (this is certainly not used that rarely since we all use Telerik components!) or for a more generic solution look for types that are derived from Window.

Under Review
Last Updated: 16 Jul 2020 11:59 by ADMIN
Created by: Eli
Comments: 17
Type: Feature Request
We display data inside an HtmlTextBox that was entered using the RadEditor.  It would be great if the Reporting HtmlTextBox could be brought much closer or even in line with tag support as the editor.  We are frequently running into issues with uncommon tags (that we strip out for the HtmlTextBox) and also with spacing being different.  We work around the issues we have, but continuing increased tag support or auto stripping of unsupported tags would be very appreciated.
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