Cancel Report Generation

[Paul]

Is there anyway to cancel a report being generated with RenderReport?  For example, we are creating a PDF of a report that takes some time to finish.  Is there any asynchronous ways of creating the report such that we can cancel its execution? 

 

I saw a post on here a few years ago that it couldn't be canceled, but I'm hoping something has been done since then to change this.  Thanks for any guidance.

Example:

ReportProcessor reportProcessor = new ReportProcessor();                      

ReportLibrary.TestReport report = new ReportLibrary.TestReport();                                               InstanceReportSource reportSource = new InstanceReportSource();                         

reportSource.ReportDocument = report;                         

RenderingResult result = reportProcessor.RenderReport("PDF", reportSource, null);

[Todor]

Hi Paul,

Currently, the generation of a report cannot be cancelled.

A possible workaround is to run the ReportProcessor in a separate thread, and kill the thread based on some custom condition (i.e. after some time).

Regards,
Todor
Progress Telerik

[Ashish Kumar]

Is it true for this RenderReport method as well ?

https://docs.telerik.com/reporting/api/telerik.reporting.processing.reportprocessor#Telerik_Reporting_Processing_ReportProcessor_RenderReport_System_String_Telerik_Reporting_ReportSource_System_Collections_Hashtable_Telerik_Reporting_Processing_CreateStream_System_Threading_CancellationToken_System_String__

As this RenderReport method accepts the CancellationToken and this is the description of that parameter

A CancellationToken instance that allows to cancel the current rendering.

We are providing user with scheduled download of the Report if data is huge, and we are currently using this method

https://docs.telerik.com/reporting/api/telerik.reporting.processing.reportprocessor#Telerik_Reporting_Processing_ReportProcessor_RenderReport_System_String_Telerik_Reporting_ReportSource_System_Collections_Hashtable_Telerik_Reporting_Processing_CreateStream_System_String__

And wrapping this in Task.Run and kill the thread after 10 mins, if still not completed, but killing the thread is causing instability sometime, it is brining down the complete WebJob itself.

Hence, was thinking of switching to the method which accepts CancellationToken, but before that wanted to confirm the behaviour.

[Todor]

Hello Ashish,

I confirm that you may use the method RenderReport(String, ReportSource, Hashtable, CreateStream, CancellationToken, out String).

The CancellationToken was introduced with R2 2020 (14.1.20.513) and lets you cancel the current report rendering. Note that the thread was opened in 2018 when the CancellationToken was not available.

You may also attach a Trace Listener to your application (Troubleshooting Reporting Implementation Into ASP.NET Core Application) to check the exact cause for the failure and try to fix it.