async-await

问题 Following is Async Cache and Database update using Transaction Scope. I cannot use TransactionScopeAsyncFlowOption.Enabled introduced in the v 4.5.1, since the Apache Ignite.Net Cache I am using doesn't support it. I have tried finding a workaround by capturing the current Synchronization Context and then explicitly using Synchronization Context Send method to complete the transaction, but this doesn't work as I still get an error Transaction scope must be disposed on same thread it was

问题 This question already has answers here : Passing async method into Parallel.ForEach (3 answers) Parallel foreach with asynchronous lambda (5 answers) parallel.foreach and httpclient - strange behaviour (2 answers) Closed last month . In the code below (a fairly simple one just for demonstration), my finally clause gets executed when awaiting for the HttpClient to finish. So the output is something like: Done StatusCode: 200,... When I was expecting it to be: StatusCode: 200,... Done class

问题 I'm trying to use async/await but I think I'm misunderstanding something critically. As basically as possible, I am trying to calculate the distance between a list of locations and one designated location using google maps api. Here is a rough example of what I'm trying to do: https://jsfiddle.net/qu5y69rj/1/ You can see that the result of that function is undefined 3 times instead of what I would expect which would be {distance: "ZERO_RESULTS"} for each call in the case of my contrived

问题 I'm trying to use async/await but I think I'm misunderstanding something critically. As basically as possible, I am trying to calculate the distance between a list of locations and one designated location using google maps api. Here is a rough example of what I'm trying to do: https://jsfiddle.net/qu5y69rj/1/ You can see that the result of that function is undefined 3 times instead of what I would expect which would be {distance: "ZERO_RESULTS"} for each call in the case of my contrived

问题 In Brief I have a Windows Service that executes several jobs as async Tasks in parallel. However, when the OnStop is called, it seems that these are all immediately terminated instead of being allowed to stop in a more gracious manner. In more detail Each job represents an iteration of work, so having completed its work the job then needs to run again. To accomplish this, I am writing a proof-of-concept Windows Service that: runs each job as an awaited async TPL Task (these are all I/O bound

问题 What is the difference between ResultType result = await Task.Run(() => GetResultAsync()) and ResultType result = await Task.Run(async() => await GetResultAsync()) I would speculate that the former would fire and forget GetResultAsync() , since it is not awaited, but then how does it get the result? I am surprised that the return type of the former Task.Run is Task<ResultType> and not Task<Task<ResultType>> . 回答1: Both do the same from perspective of result. In both cases the overload Task

问题 What is the difference between ResultType result = await Task.Run(() => GetResultAsync()) and ResultType result = await Task.Run(async() => await GetResultAsync()) I would speculate that the former would fire and forget GetResultAsync() , since it is not awaited, but then how does it get the result? I am surprised that the return type of the former Task.Run is Task<ResultType> and not Task<Task<ResultType>> . 回答1: Both do the same from perspective of result. In both cases the overload Task

问题 What is the difference between ResultType result = await Task.Run(() => GetResultAsync()) and ResultType result = await Task.Run(async() => await GetResultAsync()) I would speculate that the former would fire and forget GetResultAsync() , since it is not awaited, but then how does it get the result? I am surprised that the return type of the former Task.Run is Task<ResultType> and not Task<Task<ResultType>> . 回答1: Both do the same from perspective of result. In both cases the overload Task

问题 I'm trying to get information (true/false) from AsyncStorage in a function and create a string which is importent to fetch data in the next step. My problem is, the function is not finished until the string is required. I tried many solutions from the internet like async function and await getItem or .done() or .then(), but none worked out for me. The current behaviour is that the console displays first "channel required: " than "channel: channel_id0". 回答1: Aspects in your question are

问题 I'm trying to create a set of test methods using Moq to cover the external dependencies. These dependencies are async in nature and I have come across a set of them that when awaited they never return, so I'm not sure what I'm missing. The test itself is very simple. [TestMethod] public async Task UpdateItemAsync() { var repository = GetRepository(); var result = await repository.UpdateItemAsync("", new object()); Assert.IsNotNull(result); } The GetRepository method above is what sets up the