这也很重要，因为ConsoleApp不像UI App(Winform/WPF), 它没有SynchronizationContext来Post异步后的代码块，instead, 它是新建一个线程来运行TaskAwaiter里的异步代码块。这种行为和asp.net core一致。而传统asp.net则是有
这种没有SynchronizationContext的环境意味着你可以放心大胆地用.Wait(), task.Result等来阻塞task，而不用担心Library中没有ConfigureAwait(false)而引起的死锁。因为Library的异步方法总能从thread pool中找到新的线程来resume执行。
private async static Task GetResult()
{
HttpClient client = new HttpClient();
var task = client.GetAsync(“http://www.google.com”);
var str = await task; //start a new thread to access google.com
var task2 = task.ContinueWith(e =>
{ //start another new thread to resume the execution after http get
System.Threading.Thread.Sleep(10000);
if (e.IsCompleted)
{
Console.WriteLine(str.Content.ReadAsStringAsync().Result);
}
});
Console.WriteLine(“Waiting for the result”);
await task2; //The whole GetResult task consists of two sub-tasks(two steps before completion)
}
static void Main(string[] args)
{
GetResult().Wait(); //Block the main thread before exit, no problem, no deadlock.
Console.ReadKey();
}