async-await

问题 If the statements in the call graph after "await" point does not access any object whose type is not derived from System.Windows.UIElement class, can we say that the developer safely use ConfigureAwait(false) for Windows Mobile apps? What kind of statements must have been executed on UI thread besides updating GUI elements? 回答1: Any code that directly (or indirectly) manipulates UI elements should be run in the UI context. Usually, this just includes direct manipulation and updating

问题 If the statements in the call graph after "await" point does not access any object whose type is not derived from System.Windows.UIElement class, can we say that the developer safely use ConfigureAwait(false) for Windows Mobile apps? What kind of statements must have been executed on UI thread besides updating GUI elements? 回答1: Any code that directly (or indirectly) manipulates UI elements should be run in the UI context. Usually, this just includes direct manipulation and updating

问题 I am getting intermittent deadlocks when using HttpClient to send http requests and sometimes they are never returning back to await SendAsync in my code. I was able to figure out the thread handling the request internally in HttpClient / HttpClientHandler for some reason has a SynchronizationContext during the times it is deadlocking. I would like to figure out how the thread getting used ends up with a SynchronizationContext , when normally they don't have one. I would assume that whatever

问题 In Javascript, I am trying to return an await'd result from an async function. It seems if I use that result inside the async function then everything works fine, it gets treated as the resolve() parameter and everything is fine and dandy. However if I try to return the result, it gets treated as a callback, even though the await statement is there. For example (using await'd result inside the async func): https://jsfiddle.net/w7n8f7m7/ <script src="https://ajax.googleapis.com/ajax/libs

问题 In Javascript, I am trying to return an await'd result from an async function. It seems if I use that result inside the async function then everything works fine, it gets treated as the resolve() parameter and everything is fine and dandy. However if I try to return the result, it gets treated as a callback, even though the await statement is there. For example (using await'd result inside the async func): https://jsfiddle.net/w7n8f7m7/ <script src="https://ajax.googleapis.com/ajax/libs

问题 I am using an async/await method returning IAsyncEnumerable<> to retrieve rows from a SQL Server database and provide them via a Web API .Net Core 3.0 interface. It works fine until I exceed 8192 rows. It fails for rows beyond that point. I have tried 3 different tables, each with very different row sizes. Each time the failure occurs after yielding 8192 rows. Here is the error I see: An unhandled exception occurred while processing the request. InvalidOperationException:

问题 Does .NET resume an await continuation on a new different thread pool thread or reuse the thread from a previous resumption? Let's image below C# code in a .NET Core console application: using System; using System.Threading; using System.Threading.Tasks; namespace NetCoreResume { class Program { static async Task AsyncThree() { await Task.Run(() => { Console.WriteLine($"AsyncThree Task.Run thread id:{Thread.CurrentThread.ManagedThreadId.ToString()}"); }); Console.WriteLine($"AsyncThree

问题 Does .NET resume an await continuation on a new different thread pool thread or reuse the thread from a previous resumption? Let's image below C# code in a .NET Core console application: using System; using System.Threading; using System.Threading.Tasks; namespace NetCoreResume { class Program { static async Task AsyncThree() { await Task.Run(() => { Console.WriteLine($"AsyncThree Task.Run thread id:{Thread.CurrentThread.ManagedThreadId.ToString()}"); }); Console.WriteLine($"AsyncThree

问题 Given I have an async generator: async function* generateItems() { // ... } What's the simplest way to iterate all the results into an array? I've tried the following: // This does not work const allItems = Array.from(generateItems()); // This works but is verbose const allItems = []; for await (const item of generateItems()) { allItems.push(item); } (I know this is potentially bad practice in a Production app, but it's handy for prototyping.) 回答1: Looks like the async-iterator-to-array npm

问题 Given I have an async generator: async function* generateItems() { // ... } What's the simplest way to iterate all the results into an array? I've tried the following: // This does not work const allItems = Array.from(generateItems()); // This works but is verbose const allItems = []; for await (const item of generateItems()) { allItems.push(item); } (I know this is potentially bad practice in a Production app, but it's handy for prototyping.) 回答1: Looks like the async-iterator-to-array npm