如果将类型化的http客户端与Task.WhenAll（）一起使用，则会抛出套接字异常

Question

我为typed Http client配置了Polly。这是我的Program.cs：

       serviceCollection.AddSingleton<IPolicyBuilder, PolicyBuilder>();
       serviceCollection
                .AddHttpClient<ICustomHttpClient, CustomHttpClient>()
                .AddPolicyHandler((serviceProvider, httpRequestMessage) =>
                {
                    var policyBuilder = serviceProvider.GetRequiredService<IPolicyBuilder>();
                    return policyBuilder.BuildGenericPolicy();
                });

我键入的客户端：

    public class CustomHttpClient: ICustomHttpClient
    {
        private readonly HttpClient _httpClient;

        public NotificationsApiHttpClient(HttpClient httpClient)
        {
            _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
        }

        public async Task<HttpResponseMessage> SendEmailCommandAsync(string jsonEmailCommand)
        {
            return await _httpClient.PostAsync(new Uri("dummy uri"), new StringContent("dummy content"));
        }

我需要发送这批HTTP请求，并且对响应不感兴趣。我注入我键入的CustomHttpClient。为了提高性能，我尝试这样做：

var tasks = new List<Task>();

foreach(item in collection)
{
  tasks.Add(_customHttpClient.SendEmailCommandAsync("dummyJsonContent");
}

await Task.WhenAll(tasks);

如果我的数组中有大约100多个项目，我总是会遇到此异常：

System.Threading.Tasks.TaskCanceledException
  HResult=0x8013153B
  Message=The operation was canceled.
  Source=System.Net.Http
  StackTrace:
   at System.Net.Http.HttpConnection.<SendAsyncCore>d__61.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
   at System.Net.Http.HttpConnectionPool....

Inner Exception 1:
IOException: Unable to read data from the transport connection: The I/O operation has been aborted because of either a thread exit or an application request.

Inner Exception 2:
SocketException: The I/O operation has been aborted because of either a thread exit or an application request

PS。抱歉，因为它太长，所以不得不将stacktrace缩小

它的工作原理与此无一例外：

foreach(item in collection)
{
  await _customHttpClient.SendEmailCommandAsync("dummyJsonContent");
}