C# async/await

1. Expalin
https://blog.darkthread.net/blog/async-aspnet/


2. code
https://docs.microsoft.com/zh-tw/dotnet/csharp/language-reference/operators/await


---
using System;
using System.Net.Http;
using System.Threading.Tasks;

public class AwaitOperator
{
    public static async Task Main()
    {
        Task<int> downloading = DownloadDocsMainPageAsync();
        Console.WriteLine($"{nameof(Main)}: Launched downloading.....1\n");

        int bytesLoaded = await downloading;
        Console.WriteLine($"{nameof(Main)}: Downloaded {bytesLoaded} bytes.....4\n");

    }

    private static async Task<int> DownloadDocsMainPageAsync()
    {
        Console.WriteLine($"{nameof(DownloadDocsMainPageAsync)}: About to start downloading.....2\n");
     
        var client = new HttpClient();
        byte[] content = await client.GetByteArrayAsync("https://docs.microsoft.com/en-us/");
     
        Console.WriteLine($"{nameof(DownloadDocsMainPageAsync)}: Finished downloading.....3");
        return content.Length;
    }
}

---


3. online c#
https://dotnetfiddle.net/

dotnet fileter choose .netcore3.0


4.
https://stackoverflow.com/questions/19335451/async-and-await-are-not-working


5. Very goodd
https://www.huanlintalk.com/2016/01/async-and-await.html