Handling long running operation in VisualizerObjectSource

[Giorgi]

In my EFCore.Visualizer project I have a custom VisualizerObjectSource that retrieves query plan. But in some cases, if the query is complex or database connection is slow the time to retrieve the plan exceeds the five seconds timeout that third party visualizers have and users get Evaluation timed out error

I tried to implement a solution according to Work with large and complex objects but in my case I can't break down plan retrieval into smaller actions. Instead, my idea was to start a long running task with Task.Run and call RequestDataAsync until the task is finished. But this approach doesn't work either because when VS is in break mode it doesn't run other threads so I get: StreamJsonRpc.RemoteInvocationException: cannot evaluate expression since the function evaluation requires all threads to run.

Is there any way to tell VS to run my task or is there some other way to execute long running operation without causing timeout from VS?

[mpeyrotc]

Hello @Giorgi, sadly that is a limitation that the debugger enforces to every evaluation that happens within the debugger. In the case of visualizers, no evaluation can take more than 5 seconds. I will see if there is anything that can be done to make your visualizer work and then get back to you. Thanks!

[Giorgi]

Yes, I understand that there is a 5-second limit for the RequestDataAsync but I could call it in a loop if there was a way to use Task.Run inside debuggee without getting StreamJsonRpc.RemoteInvocationException