async-await

问题 I'm a bit confused on whether the async methods work properly with an SSIS job or not. The Script Task items create a visual studio project that targets .NET Framework 4.5, with an output type of Class Library. If I make the main method public async void Main() and inside it do await calls against async methods, is it really waiting? Some of the posts I've seen here imply it does, and others imply it does not. 回答1: Unfortunately, SSIS Framework and base .Net classes were created well before

问题 When I call an async method and get a task back, will that immediately throw or will it wait until I await the task? In other words, will this code work? Or will I have to wrap the method call in the try-block as well? Task task = ThisMethodWillThrow(); try { await task; } catch (Exception e) { Console.WriteLine("oops"); } 回答1: Both are possible. If the method is actually async (i.e. uses the C# async keyword in the declaration), then the C# compiler wraps it up in such a way that it will

问题 When I call an async method and get a task back, will that immediately throw or will it wait until I await the task? In other words, will this code work? Or will I have to wrap the method call in the try-block as well? Task task = ThisMethodWillThrow(); try { await task; } catch (Exception e) { Console.WriteLine("oops"); } 回答1: Both are possible. If the method is actually async (i.e. uses the C# async keyword in the declaration), then the C# compiler wraps it up in such a way that it will

问题 When I call an async method and get a task back, will that immediately throw or will it wait until I await the task? In other words, will this code work? Or will I have to wrap the method call in the try-block as well? Task task = ThisMethodWillThrow(); try { await task; } catch (Exception e) { Console.WriteLine("oops"); } 回答1: Both are possible. If the method is actually async (i.e. uses the C# async keyword in the declaration), then the C# compiler wraps it up in such a way that it will

问题 This question already has answers here : Await on a completed task same as task.Result? (2 answers) Closed 5 years ago . Is there any functional, performance, or risk of deadlock difference in the below code blocks? Example 1: await Task.WhenAll(task1, task2); var result1 = await task1; var result2 = await task2; Example 2: await Task.WhenAll(task1, task2); var result1 = task1.Result; var result2 = task2.Result; 回答1: Is there any functional, performance, or risk of deadlock difference in the

问题 This question already has answers here : Await on a completed task same as task.Result? (2 answers) Closed 5 years ago . Is there any functional, performance, or risk of deadlock difference in the below code blocks? Example 1: await Task.WhenAll(task1, task2); var result1 = await task1; var result2 = await task2; Example 2: await Task.WhenAll(task1, task2); var result1 = task1.Result; var result2 = task2.Result; 回答1: Is there any functional, performance, or risk of deadlock difference in the

问题 const fetch = require("node-fetch"); async function getPokemon() { const response = await fetch('https://pokeapi.co/api/v2/pokemon/1'); console.log(response); return response; } getPokemon(); I am not sure this is working. I get back: Response { size: 0, timeout: 0, [Symbol(Body internals)]: { body: Gunzip { _readableState: [ReadableState], readable: true, _events: [Object], _eventsCount: 7, _maxListeners: undefined, _writableState: [WritableState], writable: true, allowHalfOpen: true,

问题 Closed. This question needs debugging details. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 days ago . Improve this question Here is my code. An event handler for WPF button that reads lines of a file: private async void Button_OnClick(object sender, RoutedEventArgs e) { Button.Content = "Loading..."; var lines = await File.ReadAllLinesAsync(@"D:\temp.txt"); //Why blocking UI Thread??? Button.Content =

问题 I have an AsyncRead and want to convert it to a Stream<Item = tokio::io::Result<Bytes>> with tokio 0.2 and futures 0.3. The best I've been able to do is something like: use bytes::Bytes; // 0.4.12 use futures::stream::{Stream, TryStreamExt};; // 0.3.1 use tokio::{fs::File, io::Result}; // 0.2.4 use tokio_util::{BytesCodec, FramedRead}; // 0.2.0 #[tokio::main] async fn main() -> Result<()> { let file = File::open("some_file.txt").await?; let stream = FramedRead::new(file, BytesCodec::new())

问题 I want to link async method to a delegate command in prism framework in Xamarin.Forms and my question is how to do it? Is below solution correct? Is there exist any pitfall? (deadlock, UI slow or freezing, bad practices, ...) { // My view model constructor ... MyCommand = new DelegateCommand(async () => await MyJobAsync()); ... } private async Task MyJobAsync() { ... // Some await calls ... // Some UI element changed such as binded Observable collections } 回答1: You can use async void directly