task

I have the following lines in my code: var taskA = Task.Factory.StartNew(WorkA); var taskB = Task.Factory.StartNew(WorkB); var allTasks = new[] { taskA, taskB }; Task.Factory.ContinueWhenAll(allTasks, tasks => FinalWork(), TaskContinuationOptions.OnlyOnRanToCompletion); But when I run this, I get the following error: It is invalid to exclude specific continuation kinds for continuations off of multiple tasks. Which is caused by the option TaskContinuationOptions.OnlyOnRanToCompletion . My question is how to check that all tasks have done their work properly (all tasks statuses are

I have a long-running operation that have to be done in UI thread (involves UI elements that cannot be freezed). I want to display a busy indicator before running the operation. busyIndicator.Visibility = Visibility.Visible; LongRunningMethod(); busyIndicator.Visibility = Visibility.Collapsed; Of course this does not work because rendering does not occur until the operation finishes. I tried to use Task.Yield() to run the rest of method asynchronously: busyIndicator.Visibility = Visibility.Visible; await Task.Yield(); LongRunningMethod(); This also does not work, as far as I understand,

I have "Googled" but still confused with Task, Thread, and Background Worker..... Is "Task is a high level API that running on current thread" correct ? If 1 is correct, why I need to use invoke to change the UI inside the task at same thread ? Backgroundworker only got lowest priority in the application ? So the performance of backgroundworker is lower than task and thread ? Right ? Finally, in my application I need to get a string from server using "HttpWebRequest", after that parse the string and update the UI. If I use "HttpWebRequest.BeginGetResponse" to wait for the async result and

After reading information about task and exepcion management, I am using this code to manage an exception thrown in a Task: Task<Object> myTask = Task.Factory.StartNew<Object>(doTask, CancellationToken.None, TaskCreationOptions.None, TaskScheduler.Default); myTask .ContinueWith(task => afterTask(task), TaskScheduler.FromCurrentSynchronizationContext()); Where doTask and AfterTask are: private <Object> doTask() { throw new Exception("BOOM"); } private afterTask(Task<Object> aTask) { if (aTask.IsFaulted) { MessageBox.Show(aTask.Exception.InnerException.Message); } else //whatever } When

I have an Interface I that is implemented in two places like: interface I { Task DoSomething(); } The interface has async Task DoSomething method API that is then implemented in class A like: class A : I {....} class B : I {....} In class A, the implementation of DoSomething is like below and that is OK: public async Task DoSomething() { if (...) { await DoIt(); } } However, in class B, the implementation of DoSomething() should not do anything. So, its implementation looks like this: public async Task DoSomething() { // nothing } This compiles but I am not sure how correct it is do do

Activity 生命周期： 生命周期7个方法的调用时机： 1）onCreate：第一次创建这个Activity时， 也就是系统中没有缓存当前的Activity时，这个方法首先被调用。调用之后这个Activity就会被压入所谓的Android Task栈中缓存起来，下次用时出栈就可以。所以，为了更加节约资源，我们一般把Activity所对应的layout中拥有的组件首先使用private作为这个Activity的私有成员，然后在onCreate方法中初始化，这样只要在Activity创建的时候，初始化一次组件就够了。 2）onstart：当这个Activity成为用户可见状态时， 也就是在手机界面上正确显示的时候这个方法会被调用。所以，如果一个Activity之前已经创建好了，下次再次调用时（比如返回按钮）就会从Task栈中获取直接返回给用户，那么就不会再调用onCreate了，而是先调用onRestart,然后等到用户可见状态时调用onStart。 3）onResume：当这个Activity成为用户可见状态而且用户可以获取焦点时， 也就是在onStart之后，当这个视图可以与用户交互时这个方法会被调用。这个方法调用完成之后，整个Activity就是处于运行状态了。 4）onPause：当一个Activity正在使用，这时另一个Activity开始启动

I'm having issues getting Grunt to perform requirejs optimization on a project with the following structure: static/js |── apps |── app.js |── dash.js |── news.js ... (many more 'app' files) |── build |── collections |── libs |── models |── util |── views Each of static/js/apps/*.js should be compiled to static/js/build/*.js containing the relevant dependencies (eg. views/view1 , libs/query etc). This is currently being performed by a basic bash script: JS_ROOT="static/js" for f in ${JS_ROOT}/apps/* do FILE=$(basename -s .js ${f}) pushd . cd ${JS_ROOT} && r.js -o baseUrl=. name=libs/require