Await Task.Run(); return; vs. return Task.Run(): What's the Crucial Difference in Async Programming?

The key difference between

and in asynchronous programming await Task.Run(); return; return Task.Run(); In asynchronous programming, understanding the difference between

and

is very important. Although these two structures look similar, their behavior is essentially different: await Task.Run(); return Task.Run(); Disposure:

A significant difference is that abnormal dissemination. The abnormalities thrown in the asynchronous method are stored in the

object returned, and the state is observed before the task is observed. Instead, in the non -exotic method, any throwing abnormality will immediately be triggered on the same thread, making it easier to capture.

Task Synchronous context perception: Task Task

asynchronous Methods essentially perceive the current synchronization context. When encountering the statement, the operation will be arranged in the current context to ensure that any operation related to UI is performed on the UI thread. However, non -asynchronous methods do not have such perceptions, which may cause synchronization problems.

The possibility of dead lock:

In some cases, calling Task in the UI thread may lead to a deadlock. This is because the thread is blocked and waits for await to complete, thereby effectively preventing UI from updating. Task Avoid this problem by running tasks.

Code difference:

and

generated code. The former generates an asynchronous state, while the latter creates a await Task.Run() object. Asynchronous state machine allows methods to hang and recover after the task is completed. Task return Task.Run() In short, although and

may have similarities in grammar, their behavior differences are significant. When choosing between the two, consider the possibility of abnormal dissemination, synchronous context perception and deadlock.

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