I need to run multiple async tasks in a console application, and wait for them all to complete before further processing. There’s many articles out there, but I seem to get more confused the more I read. I’ve read and understand the basic principles of the Task library, but I’m clearly missing a link somewhere. … Read more
Edit: This question looks like it might be the same problem, but has no responses… Edit: In test case 5 the task appears to be stuck in WaitingForActivation state. I’ve encountered some odd behaviour using the System.Net.Http.HttpClient in .NET 4.5 – where “awaiting” the result of a call to (e.g.) httpClient.GetAsync(…) will never return. This … Read more
I have a Parallel.ForEach() async loop with which I download some webpages. My bandwidth is limited so I can download only x pages per time but Parallel.ForEach executes whole list of desired webpages. Is there a way to limit thread number or any other limiter while running Parallel.ForEach? Demo code: Parallel.ForEach(listOfWebpages, webpage => { Download(webpage); … Read more
I thought that they were basically the same thing — writing programs that split tasks between processors (on machines that have 2+ processors). Then I’m reading this, which says: Async methods are intended to be non-blocking operations. An await expression in an async method doesn’t block the current thread while the awaited task is running. … Read more
I would like to ask you on your opinion about the correct architecture when to use Task.Run. I am experiencing laggy UI in our WPF .NET 4.5 application (with Caliburn Micro framework). Basically I am doing (very simplified code snippets): public class PageViewModel : IHandle<SomeMessage> { … public async void Handle(SomeMessage message) { ShowLoadingAnimation(); // … Read more
Is there to way write a T-SQL command to just make it sleep for a period of time? I am writing a web service asynchronously and I want to be able to run some tests to see if the asynchronous pattern is really going to make it more scalable. In order to “mock” an external … Read more
How can I reject a promise that returned by an async/await function? e.g. Originally: foo(id: string): Promise<A> { return new Promise((resolve, reject) => { someAsyncPromise().then((value)=>resolve(200)).catch((err)=>reject(400)) }); } Translate into async/await: async foo(id: string): Promise<A> { try{ await someAsyncPromise(); return 200; } catch(error) {//here goes if someAsyncPromise() rejected} return 400; //this will result in a resolved … Read more
What is the difference between Task.WaitAll() and Task.WhenAll() from the Async CTP ? Can you provide some sample code to illustrate the different use cases ? 4 Answers 4
What is the difference between asynchronous and non-blocking calls? Also between blocking and synchronous calls (with examples please)? 14 Answers 14 In many circumstances they are different names for the same thing, but in some contexts they are quite different. So it depends. Terminology is not applied in a totally consistent way across the whole … Read more
I have an AngularJS service that I want to initialize with some asynchronous data. Something like this: myModule.service(‘MyService’, function($http) { var myData = null; $http.get(‘data.json’).success(function (data) { myData = data; }); return { setData: function (data) { myData = data; }, doStuff: function () { return myData.getSomeData(); } }; }); Obviously this won’t work because … Read more
