How to reuse Chrome

[Agee]

I use a service for PDF conversion, which simply creates a static converter variable. Then, when the request is received, converttopdf() is called for conversion. However, I found the following anomalies occasionally:

An unhandled exception has occurred while executing the request.
System.NullReferenceException: Object reference not set to an instance of an object.
   at ChromeHtmlToPdfLib.Browser.PrintToPdf(PageSettings pageSettings, CountdownTimer countdownTimer)
   at ChromeHtmlToPdfLib.Converter.ConvertToPdf(ConvertUri inputUri, Stream outputStream, PageSettings pageSettings, String waitForWindowStatus, Int32 waitForWindowsStatusTimeout, Nullable`1 conversionTimeout, Nullable`1 mediaLoadTimeout, Stream logStream)
   at ChromeHtmlToPdfLib.Converter.ConvertToPdf(ConvertUri inputUri, String outputFile, PageSettings pageSettings, String waitForWindowStatus, Int32 waitForWindowsStatusTimeout, Nullable`1 conversionTimeout, Nullable`1 mediaLoadTimeout, Stream logStream)

I can't find the reason.
Is it because of multithreading, or does chrome hibernate itself after it starts?

Please help me. Thank you

[Kees]

Are you using your code multithreaded? If so then you need to add the attribute [ThreadStatic] to your static variable like this

[ThreadStatic] SomeVariableType TheVariable

[Agee]

This solution should work, but when there are many threads, a lot of Chrome will be created, and it cannot be closed automatically.

[Kees]

It should not be a problem to start chrome 10 or 20 times. I have a production machine that does something similar without any problems.