Question

获得一个将数据保存到数据库的void函数，一旦数据被保存，我试图调用一个函数来发送推送通知，它应该运行 async 但事实并非如此。我做错了什么？

    public void Save(MyModel m)
    {
        using (var conn = Databases.DB)
        {
            var d = new DynamicParameters(new
            {
                m.Name
            });

            conn.Execute("INTRANET__CreateTicket", d, commandType: CommandType.StoredProcedure);

            //send push notifications
            Task.Run(() => SendRaisedTicketNotifications(m));

        }
     }

    private async void SendRaisedTicketNotifications(NewAmbercatTicketView t)
    {
        await Task.Run(() =>
        {
            //Send push notifications
            var sub = new Subscritption();

            var people = UserRepository.List();
            foreach (var person in people)
            foreach (var sub in UserPushRepository.List().Where(x => x.PersonId == person.PersonId && x.Subscribed))
            {
                var notification = new PushNotification("Some content")
                notification.SendPushNotification(sub);
            }
        });
     }

Answer 1

Stephen Cleary在blog中广泛涵盖了如何不使用Task.Run。

由于您不想等待异步回调完成，您当然可以启动另一个线程并完全忘记Task.Run，因为您无论如何都没有实际使用该任务。

public void Save(MyModel m)
{
    using (var conn = Databases.DB)
    {
        var d = new DynamicParameters(new
        {
            m.Name
        });

        conn.Execute("INTRANET__CreateTicket", d, commandType: CommandType.StoredProcedure);

        //send push notifications in BackgroundThread
        Thread sendInBackground = new Thread(new ParametrizedThreadStart(SendRaisedTicketNotifications));
        sendInBackground.IsBackground = true;
        sendInBackground.Start(m);

    }
 }

private void SendRaisedTicketNotifications(NewAmbercatTicketView t)
{
    //Send push notifications
    var sub = new Subscritption();

    var people = UserRepository.List();
    foreach (var person in people)
    foreach (var sub in UserPushRepository.List().Where(x => x.PersonId == person.PersonId && x.Subscribed))
    {
        var notification = new PushNotification("Some content")
        notification.SendPushNotification(sub);
    }
 }

Answer 2

尝试此操作以发送通知：

Task.Run(() => SendRaisedTicketNotifications(m)).Wait();

在void C＃中调用异步方法

2 个答案: