Await Task.Run() vs. Return Task.Run(): What are the Key Differences in C# Asynchronous Programming?

C#asynchronous programming

The key difference between await Task.Run() return Task.Run() In asynchronous programming, it is often necessary to perform operations outside the UI thread to avoid the application of the application. This can be achieved through the task in C#. However, there are subtle differences between

and

when dealing with abnormalities and other aspects. await Task.Run() return Task.Run() <.> 1. Disposure:

The main difference is that abnormal communication. In situation:

The abnormalities in the asynchronous task will only spread the callback method only when waiting for the task. await Task.Run()

This allows them to deal with abnormalities in a controlled manner to prevent them from accidentally throwing it on the UI thread.

On the contrary, in In the case:

The abnormalities thrown during the task execution will be immediately thrown back to the call method, and even before observing the task.

return Task.Run() This may lead to accidental errors and potential deadlocks.

• <.> 2. Dependence on synchronous context:
Another difference is

version depends on the synchronization context of calling threads. When the task is completed, it will be executed in the same synchronization context. This ensures that the UI update (such as enabling the disabled button) occurs on the correct thread.

On the contrary, the version does not depend on the context of synchronization. Continuing the arrangement of the default task scheduling program, which may be different from the synchronization context of calling threads.

<.> 3. The generated code:

await Task.Run()

The code generated by the two methods is slightly different. In the case of , a Async/Await status machine will be created to manage asynchronous execution. This leads to a more complicated code than .

return Task.Run() Code example:

The following code example illustrates these differences:

Example 1:

await Task.Run() return Task.Run()

Example 2:

In these two examples, "dosomework ()" is a method of performing certain jobs outside the UI thread.

Conclusion:

The choice of and

depends on the specific needs of the application. When controlling abnormal dissemination and ensuring correct synchronization context is important, it is recommended to use

async Task TestAsync()
{
    await Task.Run(() => DoSomeWork()); // 异常在等待时传播回
}

. When it is not a problem to spread anomalies or synchronize contexts immediately,

is suitable.

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