6,289 questions
1
vote
3
answers
147
views
Why are Minimal API endpoints waiting for Tasks?
Building a basic ASP.NET Core Minimal API, I was surprised by the fact that if an endpoint returns a Task, the request does not return until the Task is done:
var builder = WebApplication....
- 13.5k
1
vote
2
answers
97
views
Why do `ParallelQuery.ToArray()` and `ToList()` return ordered sequence?
The doc listed the operators in the table that ToArray should be unordered when the parallelquery source is unordered. However, the result turned out to be always ordered when force evaluated to array ...
- 107
0
votes
2
answers
98
views
Any side effects when writing LINQ-like extensions for Task<IEnumerable<T>>?
I'm a little bit annoyed of parentheses in situations like this:
var items = (await SomeService.GetDataAsEnumerableAsync()).ToList();
So I thought of creating an extension method like:
public static ...
1
vote
2
answers
65
views
Task.WaitAll does not throw as expected
I was expecting Task.WaitAll to throw when semaphore reaches its maxcount, but the result is, all tasks were hanged.
SemaphoreSlim semaphore = new(initialCount: 3, maxCount: 10);
var tasks = ...
- 107
2
votes
2
answers
87
views
Executing mixed tasks in parallel
I have ~10000 objects of type System.Text.Json.JsonDocument. For each JsonDocument in parallel, I have to do the following steps in order.
clone JsonDocument to JsonNode
apply a sequence of tasks ...
- 3,084
0
votes
1
answer
89
views
Why does Task.Factory.StartNew for an async lambda work, when calling the lambda directly does not?
I'm writing a console application that needs to copy console input one keypress at a time to a socket (while also doing other things). In order to do that, I figure I have a couple options. In the ...
- 11.8k
0
votes
2
answers
82
views
Task.WhenAny with Task.Delay to implement a timeout mechanism does not work reliable
From within my ASP.NET application (.NET Framework 4.8) I invoke an external process via Anonymous Pipes. Theoretically, it could happen that the external process hangs (for whatever reason) when my ...
- 6,062
2
votes
1
answer
160
views
Passing CancellationTokenSource to awaited Task
Read a lot of articles an watch many videos on Task Cancelation.
But I still can't quite follow if it's possible to pass CancellationTokenSource instead of
CancellationTokenSource providing that the ...
- 284
1
vote
1
answer
70
views
Why can't I catch AbandonedMutexException after a task
I was expecting to trigger a AbandonedMutexException after a task that does not release the mutex, the program stuck when WaitOne after the task:
Mutex mutex = new();
BankAccount account = new();
...
- 107
0
votes
0
answers
42
views
Deadlock issue when scheduling task computations (F#, .NET TPL)
I am in the process of building an effect system DSL with F# inspired by ZIO and Cats Effect.
I have my effect type defined as a DU of opcodes, a fiber type, a channel type for message passing, etc. I ...
- 55
2
votes
1
answer
77
views
Why does direct throwing OperationCanceledException cancels the task [duplicate]
I read the documentation says to set status to Canceled requires three conditions:
OperationCanceledException(or its derived exception type such as TaskCanceledException) is thrown
token....
- 107
1
vote
2
answers
117
views
AggregateException is not caught
I have a problem with AggregateException thrown from .NET library. For some reason it is not caught in try-catch block. It causes whole application to crash and there are no methods from my code in ...
- 119
1
vote
2
answers
90
views
How to implement a custom Task.WhenAll that preserves the order of exceptions?
The behavior of the non-generic Task.WhenAll changed in .NET 8, and now the order of the exceptions is in chronological order instead of positional order. The new behavior is not without merits, but I ...
- 44.6k
0
votes
0
answers
85
views
Where is the difference between await Task Event and Event.Wait
I have a communications driver.
It was failing a few thousand times a day.
But after changing a single line, it now works perfectly.
// The event is set after 100ms at the latest
ManualResetEvent ...
- 82.6k
0
votes
2
answers
129
views
Task issue with Powershell and TaskScheduler
I am writing a C# library (.NET 4.6.1) that will use Tasks to be able to run several snippets of code in the background. This library will be called by a Powershell script that is triggered from a ...
- 59