ThreadStatic in asynchronous ASP.NET Web API

Question

Is there a possibility to use thread static like variables within a single request? The current code uses a thread static variable for logging purposes and now we want to use async controller methods (with async and await pattern) which results in problems because the variable is null when a new thread is opened.

Stephen Cleary · Accepted Answer · 2017-02-28 14:14:11Z

14

await can cause thread jumps, so thread static variables will naturally cause problems.

To work around this, you can either use AsyncLocal<T> (available in .NET 4.6), or (if you must) HttpContext.Current.Items. Of those two, I would definitely recommend AsyncLocal<T> over Items, if it's available on your platform.

answered Feb 28, 2017 at 14:14

Stephen Cleary

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2 Comments

vinhent Over a year ago

Can I ask you the reason why you recommend AsyncLocal over Items?

Stephen Cleary Over a year ago

I recommend AsyncLocal<T> over HttpContext.Current because HttpContext.Current is considered a poor design and has been removed in ASP.NET Core.

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