![]() ![]() BEST CRACKPACK SERVERS CODESo, in your library code (assuming you never require context), you should always use ConfigureAwait(false) in order to ensure that no context is captured for asynchronous continuations, regardless of the framework calling into your assemblies (e.g. Private async Task CompleteSynchronously() private async void Button_Click(object sender, RoutedEventArgs e)Īwait CompleteSynchronously().ConfigureAwait(false) ![]() If the Task completes synchronously, continueOnCapturedContext has no effect and the remainder of the method continues to run synchronously on the current thread. However, the capturing of the current context (either the current SynchronizationContext if null then the current TaskScheduler) only occurs when an incomplete Task is awaited. Yet, the called method runs (or at least starts to run) on the thread that the caller was running on, of course. Here, you see that the continueOnCapturedContext flag of the called method has no effect on the caller. Private async Task CompleteAsynchronously()Īwait Task.Delay(TimeSpan.FromMilliseconds(100)).ConfigureAwait(false) Logger.LogInformation() //false -> GUI contextĪwait CompleteAsynchronously().ConfigureAwait(false) private async void Button_Click(object sender, RoutedEventArgs e) BEST CRACKPACK SERVERS UPDATEWPF uses the DispatcherSynchronizationContext to resume asynchronous continuations on the UI context, because a background thread cannot update the contents of Controls. false schedules the remainder of the async method on a thread pool thread.true attempts to marshal the remainder of the async method back to the original context captured.Yes, it is needed in order to ensure that all of your asynchronous continuations within your library code are executed on a thread pool thread (depending on the SynchronizationContext/TaskScheduler in use). Should I use configure await in all methods or only in the first method? tl dr ![]() I have more background information in my MSDN article on SynchronizationContext and my async intro blog post. The only difference ConfigureAwait makes in ASP.NET is whether that thread enters the request context when resuming the method. When the method is ready to continue, any thread is snatched from the thread pool and used to resume the method. Once your async method hits an await, the method is blocked but the thread returns to the thread pool. However, with ASP.NET Web Api, if your request is coming in on one thread, and you await some function and call ConfigureAwait(false) that could potentially put you on a different thread when you are returning the final result of your ApiController function.Īctually, just doing an await can do that. ConfigureAwait(false) could be useful if you're trying to do a small amount of parallel processing of a request, but really TPL is a better fit for most of those scenarios. So ConfigureAwait(false) does not save you a thread jump in ASP.NET it does save you the re-entering of the request context, but this is normally very fast. If you do not disable the context capture, then the thread will re-enter the request context and then continue to execute the method. If you disable the context capture using ConfigureAwait(false), then the thread just continues executing the method directly. When an async method resumes execution, it grabs a thread from the ASP.NET thread pool. In ASP.NET, the situation is a bit more complex. This is true with UI applications, where there is only one UI thread that you have to "sync" back to. I had read that it is more performant since it doesn't have to switch thread contexts back to the original thread context. This video by the ASP.NET team has the best information on using async on ASP.NET. ![]() If you are on ASP.NET Core, it does not matter whether you use ConfigureAwait(false) or not.įor ASP.NET "Full" or "Classic" or whatever, the rest of this answer still applies. Update: ASP.NET Core does not have a SynchronizationContext. Best practice to call ConfigureAwait for all server-side code ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |