async-await

问题 Im getting the below error with the below set of code, It is erroring on the 'alliancelookup' line, I'm not sure what i'm doing wrong but I couldn't see anything myself. The query im running to crest seems to be running fine but It seems the issue im having is with the Awaiter, I was wondering if there was a way around this? DynamicCrest crest = new DynamicCrest(); var root = await crest.GetAsync(crest.Host); var alliancelookup = await (await root.GetAsync(r => r.alliances)).First(i => i

问题 I have been researching (including looking at all other SO posts on this topic) the best way to implement a (most likely) Windows Service worker that will pull items of work from a database and process them in parallel asynchronously in a 'fire-and-forget' manner in the background (the work item management will all be handled in the asynchronous method). The work items will be web service calls and database queries. There will be some throttling applied to the producer of these work items to

问题 I have the following async code: // Main system culture is English here Thread.CurrentThread.CurrentCulture = CultureInfo.GetCultureInfo("es"); WriteLine($"{Thread.CurrentThread.ManagedThreadId}:Culture:{Thread.CurrentThread.CurrentCulture}"); await Task.Delay(1).ConfigureAwait(false); WriteLine($"{Thread.CurrentThread.ManagedThreadId}:Culture:{Thread.CurrentThread.CurrentCulture}"); The resul I expected would be to have a different thread id after the await and that new thread id having the

问题 Suppose I have the following: IEnumerable<Task<TimeSpan>> tasks = //... TimeSpan[] results = await Task.WhenAll(tasks); // Handle results By the time I can handle the results all the task must have finished. Is there a way to handle each result on demand ? Like registering a delegate / callback that will get executed when a task is completed: IEnumerable<Task<TimeSpan>> tasks = //... await Task.WhenAll(tasks, result => { // A task has finished. This will get executed. // result is of type

问题 Here is the echo server code: #!/usr/bin/env perl6 my $port = 3333 ; say "listen port $port" ; react { my $ids = 0 ; whenever IO::Socket::Async.listen('0.0.0.0', $port ) -> $conn { my $id = $ids++ ; $conn.print( "$id: hello\n") ; whenever $conn.Supply.lines -> $line { say "$id: $line" ; $conn.print( "$id : $line\n") ; } } } here is the client code: #!/usr/bin/env perl6 my $port = 3333 ; my $conn = await IO::Socket::Async.connect('localhost', $port ); $conn.print: "{time}\n"; #$conn.Supply.tap

问题 I've not had chance to check out the CTP of the new C# async/await feature, but here's something I was wondering: How does it integrate with the message loop? I assume that in a standard Windows application (Winforms, WPF) the continuations are called by sending messages to the application's message loop, using a Dispatcher or similar? What if I'm not using a standard windows message loop? For example in a GTK# application or in a console application (if indeed this feature could be of use at

问题 my program has 3 warnings of the following statement: This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread. What is the warning try to tell me? What should I do? This is my code: Is it running using multi-threading? static void Main(string[] args) { Task task1 = new Task(Work1); Task task2 = new Task(Work2); Task task3 = new Task(Work3);

问题 The following code does not compile because SingleOrDefaultAsync() is not a suitable extension for GetAppointments(). I was just wondering why ... public IQueryable<Appointment> GetAppointments() { return Context.Appointments; } public async Task<Appointment> GetAppointmentAsync(int appointmentId) { return await GetAppointments().SingleOrDefaultAsync(a => a.ID == appointmentId); } I am using EF 6.0.0. And please ignore what I am doing here exactly. I just tried to make things easier than they

问题 I am not able to setup babel correctly for the usage of async / await. I am using babel 7 and webpack 4. I do not want to use babel-polyfill if possible! My babelrc file: { "presets": [[ "@babel/env", {"modules": false} ]], "plugins": [ "syntax-dynamic-import", "transform-async-to-generator" ] } Code: async function init() { const loaderData = await initLoader(); initCmp(loaderData) .then(initApi(loaderData.key)) .catch(); } init(); And Error: refactor.main.js:18 Uncaught ReferenceError:

问题 When I run the following code: [Test] public async Task Can_Test_Update() { var response = await _controller.UpdateAsync(Guid.NewGuid()); response.Valid.Should().BeTrue(); _commands.Received().UpdateAsync( Arg.Is<Something>( l => l.Status == Status.Updated)); } If I add " await " preceding the " _commands.Received().UpdateAsync ", it throws a null reference exception. How can I stop this happening, or is await not necessary? 回答1: I found an answer here. Received.InOrder(async () => { await