在HttpClient上实现异步和等待是不会在OSX上抛出异常

Question

After reading Stephen Cleary blog post about eliding async and await I've decided to go and play around with it. I wrote very simple console app with HttpClient using Visual Studio For Mac .

public static async Task Main(string[] args)
{
    Console.WriteLine(await Get());
    Console.WriteLine("Hello World!");
}

public static Task<string> Get()
{
    using (var http = new HttpClient())
        return http.GetStringAsync("http://google.com");
}

According to blog post it should throw an exception but it didn't . If I switch to Windows and try to run this app, I will get TaskCancelledException as expected, but on macOS it works perfectly fine.

Proof that Google.com was printed into console without exception on macOS

As I believe the reason behind this behaviour is different implementation of IDisposable in HttpClient on both platforms, but... why?

Answer 1

比较单声道存储库和dotnet存储库我发现，HttpClient的单声道实现不会在Dispose方法中调用CancellationTokenSource.Cancel（），我相信这是平台之间不一致的原因。