Can I Make My Console Application's Main Method Asynchronous?

The asynchronous main method in the console application

When trying to set the main method in the console application to asynchronous, an error may be encountered: "The Main method that cannot specify the 'async' modifier in the main method of the console application".

The compiler limits

Historically, the Visual Studio compiler limits the use of Async modifier on the main method. This is to prevent the asynchronous implementation of the natural synchronization behavior of the console program.

The support of the asynchronous Main

However, starting with Visual Studio 2017 Update 3 (15.3), C# supports the asynchronous main method, as long as they return Task or Task . This allows the following code structure:

Understanding behavior

<code class="language-csharp">class Program
{
    static async Task Main(string[] args)
    {
        // 异步代码在此处
    }
}</code>

In the asynchronous main method, the "AWAIT" keyword indication can be waiting for the object (eg, the task) to complete the method, and then return to the method. However, in the console application, the return of the main method will withdraw from the procedure.

Avoid the procedure from exiting

In order to prevent the procedure from exiting, it is necessary to provide a context compatible with asynchronous compatibility for the main method. This context maintains the program in a state of activity during the operation of asynchronous operation.

The context option

Nuget library:

use the asynccontext in Nito.asyncex Nuget bag.

asynchronous CTP: GoneralthReadaffineContext in the asynchronous CTP (if available).

Custom Main loop:
• Use asynccontext or asynchronous CTP to realize your own draft owner.
Obstruct the main thread of
• Another method is to block the main console thread until the asynchronous work is completed:
• Note: getAwaiter (). Getresult () avoids the aggregatexception packaging that occurs when using wait () or result ().

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