Async/Await vs. BackgroundWorker: When Should I Use Which for Long-Running Tasks in .NET?

.NET asynchronous programming: Async/Await and BackgroundWorker

.NET 4.5 and C# 5 framework introduced modern Async/Await asynchronous programming mode. Both are used to handle long -term operation tasks, but understanding their respective roles and applicable scenes are essential.

Async/Await

Async/Await is an asynchronous syntax sugar, which allows developers to express asynchronous behavior in a synchronous manner, thereby simplifying the readability and maintenance of the code. Async/Await function can be executed without blocking the UI thread, so as to maintain the response ability of the user interface during a long -term task period.

For example, a network request:

BackgroundWorker

<code class="language-csharp">using (WebResponse response = await webReq.GetResponseAsync())
{
    using (Stream responseStream = response.GetResponseStream())
    {
        int bytesRead = await responseStream.ReadAsync(buffer, 0, buffer.Length);
    }
}</code>

BackgroundWorker component is used to run the task of running the CEO on the thread pool thread to ensure the response ability of the UI. It provides schedule reports and completion functions, allowing developers to update the UI during the task execution process. Although the creation and execution of BackgroundWorker managed threads, it introduced additional complexity compared with Async/Await's simpler syntax.

Common application scenarios

Async/Await:

asynchronous I/O operation

Web service call

Programming the event

• Any scene that requires UI response ability
BackgroundWorker:
A single long -term operation task

The task of the progress report The scene of manual management threads

• Comparison advantages
Async/Await:

Simple and easy -to -read grammar Keep the UI response ability

Simplified event processing

BackgroundWorker:

• Provide progress report
• Provide manual thread management

Support asynchronous callback

Select the right tool

The choice of
• Async/Await and BackgroundWorker depends on the specific needs of the task.
ASYNC/AWAIT is the first choice for the scene that requires asynchronous behavior and UI response capabilities.
When the progress report and manual thread control are crucial, BackgroundWorker is still a feasible choice.

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