How Do `async` and `await` Simplify Asynchronous Programming in C#?

C#asynchronous programming

and : simplify asynchronous operations async await Asynchronous programming allows code to execute concurrently without blocking the main thread.

and Keywords simplify the writing and understanding of asynchronous operations.

async Compared with the background thread await

Unlike the traditional background threads that are independent, and use the

state machine

generated by the compiler in the background. The progress of this state machine tracking asynchronous operation allows the main thread to continue executed when the background operation is completed. async await Example details

In the example,

Button1_Click The method is marked as , because it contains asynchronous operation DosometHingasync. When Dosomethingasync is executed in the background (the specific thread depends on the thread pool configuration), the UI thread keeps response, and users can continue to interact with the application.

This line of code is completed after Dosomethingasync and the main thread is executed after the grammar receiving results. This means that the code after will only be executed after the asynchronous operation is completed. async

and

The decomposition of functions int a = 1; await await The following examples further demonstrate the execution process using

and

: async await MyMethodasync starts to execute and start the LongrunningOperationasync in the background.

The main thread is executed independently, while LongrunningOperationasync is executed in the background. async await When the LongRunningOperationasync is completed, the main thread is resumed and continued from the interrupt.

public async Task MyMethodAsync()
{
    Task<int> longRunningTask = LongRunningOperationAsync();
    // 这里可以执行其他独立的工作
    int result = await longRunningTask;
    // 这里使用result
}

public async Task<int> LongRunningOperationAsync()
{
    await Task.Delay(1000);
    return 1;
}

The result of the computing character retrieve the results of the LongRunningOperationasync and store it in the variable

.
The main thread continues to execute and uses the results obtained from asynchronous operations.

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