Does such a method exist? No. Is there any overhead to using an async method solely for this purpose? Yes. But it’s the easiest solution. Note that a more generic approach is an extension method for Task such as Then. Stephen Toub explored this in a blog post and I’ve recently incorporated it into AsyncEx. … Read more
Figured it out, the task should look like: namespace :test do task :new_task => :environment do puts Parent.all.inspect end end Notice the => :environment dependency added to the task
Normally, the intended usage for Task.Run is to execute CPU-bound code on a non-UI thread. As such, it would be quite rare for it to be used with an async delegate, but it is possible (e.g., for code that has both asynchronous and CPU-bound portions). However, that’s the intended usage. I think in your example: … Read more
You can use as many tasks as you want, the system will automatically perform queuing and execution for you. That’s one of the advantages of using the built in mechanisms To execute code on the UI thread you can use the dispatcher like this: await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () => { //UI code here });
You can do it with AlarmManager, heres a short example. First you need to set the alarm: AlarmManager am = (AlarmManager) con.getSystemService(Context.ALARM_SERVICE); Date futureDate = new Date(new Date().getTime() + 86400000); futureDate.setHours(8); futureDate.setMinutes(0); futureDate.setSeconds(0); Intent intent = new Intent(con, MyAppReciever.class); PendingIntent sender = PendingIntent.getBroadcast(con, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); am.set(AlarmManager.RTC_WAKEUP, futureDate.getTimeInMillis(), sender); Next, You need to create a … Read more
The documentation on MSDN is disappointing, but decompiling Task.Delay using Reflector gives more information: public static Task Delay(int millisecondsDelay, CancellationToken cancellationToken) { if (millisecondsDelay < -1) { throw new ArgumentOutOfRangeException(“millisecondsDelay”, Environment.GetResourceString(“Task_Delay_InvalidMillisecondsDelay”)); } if (cancellationToken.IsCancellationRequested) { return FromCancellation(cancellationToken); } if (millisecondsDelay == 0) { return CompletedTask; } DelayPromise state = new DelayPromise(cancellationToken); if (cancellationToken.CanBeCanceled) { state.Registration … Read more
In Windows, all I/O is asynchronous. Synchronous APIs are just a convenient abstraction. So, when you use HttpWebRequest.GetResponse, what actually happens is the I/O is started (asynchronously), and the calling thread (synchronously) blocks, waiting for it to complete. Similarly, when you use HttpClient.PostAsync(..).Result, the I/O is started (asynchronously), and the calling thread (synchronously) blocks, waiting … Read more
The async keyword is merely an implementation detail of a method; it isn’t part of the method signature. If a particular method implementation or override has nothing to await, then just omit the async keyword and return a completed task using Task.FromResult<TResult>: public Task<string> Foo() // public async Task<string> Foo() { // { Baz(); // … Read more
Four methods to load content in a ComboBox (or other controls) without freezing the container Form. A note: the ComboBox List doesn’t support an infinite number of Items. The DropDown will actually stop working after 65534 elements are added to the List. The DropDownList and ListBox can support more items, but these will also begin … Read more
According to someone who may be in the know… The justification is that the advantage of covariance is outweighed by the disadvantage of clutter (i.e. everyone would have to make a decision about whether to use Task or ITask in every single place in their code). It sounds to me like there is not a … Read more