Will the list of tasks being cleared after await Tasks.WhenAll(tasks)?

Question

Will the list of tasks being cleared after await Tasks.WhenAll(tasks)?

Dondon510 241

Hi,


int i=0;
List<Task> tasks = new List<Task>();

do
{
     tasks.Add(Do_Test1(i));
     tasks
     tasks
     tasks
     tasks

     await Task.WhenAll(tasks);

     // Do I need to call tasks.Clear(); here?
}

AgaveJoe 29,946 Reputation points

2025-02-18T10:18:13.8733333+00:00

Garbage collection handles reference clean up on the heap. I can't think of any logical reason why you would want to invoke tasks.Clear(); to clear a generic collection. Can you explain the problem you are trying to solve or your thought process?
Dondon510 241 Reputation points

2025-02-18T10:42:29.6933333+00:00

there is no any problem there, I'm just worry, if after await Task.WhenAll(tasks); ran, it won't clear the previous tasks.
AgaveJoe 29,946 Reputation points

2025-02-18T11:43:55.6033333+00:00

I think there some confusion here. Task.WhenAll(tasks); waits until all the tasks in the generic collection are complete. Typically, this kind of approach is used when you have a logical group of tasks that are invoked together and you want to know if all the tasks completed as expected and handle exceptions. But, your code example does nothing with the results of Task.WhenAll(tasks).

List.Clear(), removes the elements from a generic list. It is not clear what problem you are trying to solve by clearing a generic list of tasks once the tasks have completed. Can you clarify the problem you are trying to solve with this approach?

1 answer

Your answer

AgaveJoe 29,946 Reputation points

2025-02-18T10:18:13.8733333+00:00

Garbage collection handles reference clean up on the heap. I can't think of any logical reason why you would want to invoke tasks.Clear(); to clear a generic collection. Can you explain the problem you are trying to solve or your thought process?
Dondon510 241 Reputation points

2025-02-18T10:42:29.6933333+00:00

there is no any problem there, I'm just worry, if after await Task.WhenAll(tasks); ran, it won't clear the previous tasks.
AgaveJoe 29,946 Reputation points

2025-02-18T11:43:55.6033333+00:00

I think there some confusion here. Task.WhenAll(tasks); waits until all the tasks in the generic collection are complete. Typically, this kind of approach is used when you have a logical group of tasks that are invoked together and you want to know if all the tasks completed as expected and handle exceptions. But, your code example does nothing with the results of Task.WhenAll(tasks).

List.Clear(), removes the elements from a generic list. It is not clear what problem you are trying to solve by clearing a generic list of tasks once the tasks have completed. Can you clarify the problem you are trying to solve with this approach?

Answer 1

Bruce (SqlWork.com) 72,996

the list tasks will clear when the list is garbage collected. you don't show usage, but if you have no other references, the list will be released when it goes out of scope.

but if this code was in main, it would not leave scope and never get cleared (program exit does not do a garbage collect).

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Will the list of tasks being cleared after await Tasks.WhenAll(tasks)?

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