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run multiple task and await for all tasks completes

Running multiple async tasks and waiting for them all to completeCatch multiple exceptions at once?How to loop through all enum values in C#?How would I run an async Task<T> method synchronously?HttpClient.GetAsync(…) never returns when using await/asyncUsing async/await for multiple tasksHow and when to use ‘async’ and ‘await’How to safely call an async method in C# without awaitRunning multiple async tasks and waiting for them all to completeUsing ConfigureAwait(false) on tasks passed in to Task.WhenAll() failsMultiple async/await calls in a foreach loop iteration

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-2

I need to run multiple task to access to database and to wait to all task finished to obtain the result and assign it to my viewmodel, i try many sample but i have never have the result, any help please, this my code

var model = new AggregationViewModel();
var loadDataTasks = new Task[]

 Task.Run(async () =>model.Alive = await _repository.GetCountAsync<filter>(Predicate)),
 Task.Run(async () => model.Delay = await _repository.GetCountAsync<Flight>(predicate.And(x => x.Status == "refused")))
;
try

 await Task.WhenAll(loadDataTasks);
 foreach (var item in loadDataTasks)
 

 

catch (Exception ex)

c# .net asynchronous async-await

share|improve this question

edited Mar 24 at 18:25

RAM

8,25754061

asked Mar 24 at 18:01

user1428798user1428798

71131841

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possible duplicate of Running multiple async tasks and waiting for them all to complete
  
  – Volkmar Rigo
  Mar 24 at 18:03
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I try same sample but my model.Delay and model.Alive always 0, and i don't know why
  
  – user1428798
  Mar 24 at 18:07
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Your codce is missing the most essential part: how do you call this? Post the complete call chain.
  
  – Henk Holterman
  Mar 24 at 18:10
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This is my main call, do i need something else?
  
  – user1428798
  Mar 24 at 18:10
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  ok sorry for that
  
  – user1428798
  Mar 24 at 18:11
  

  
  
  
  

 | 
show 1 more comment

-2

I need to run multiple task to access to database and to wait to all task finished to obtain the result and assign it to my viewmodel, i try many sample but i have never have the result, any help please, this my code

var model = new AggregationViewModel();
var loadDataTasks = new Task[]

 Task.Run(async () =>model.Alive = await _repository.GetCountAsync<filter>(Predicate)),
 Task.Run(async () => model.Delay = await _repository.GetCountAsync<Flight>(predicate.And(x => x.Status == "refused")))
;
try

 await Task.WhenAll(loadDataTasks);
 foreach (var item in loadDataTasks)
 

 

catch (Exception ex)

c# .net asynchronous async-await

share|improve this question

edited Mar 24 at 18:25

RAM

8,25754061

asked Mar 24 at 18:01

user1428798user1428798

71131841

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possible duplicate of Running multiple async tasks and waiting for them all to complete
  
  – Volkmar Rigo
  Mar 24 at 18:03
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I try same sample but my model.Delay and model.Alive always 0, and i don't know why
  
  – user1428798
  Mar 24 at 18:07
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Your codce is missing the most essential part: how do you call this? Post the complete call chain.
  
  – Henk Holterman
  Mar 24 at 18:10
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This is my main call, do i need something else?
  
  – user1428798
  Mar 24 at 18:10
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  ok sorry for that
  
  – user1428798
  Mar 24 at 18:11
  

  
  
  
  

 | 
show 1 more comment

I need to run multiple task to access to database and to wait to all task finished to obtain the result and assign it to my viewmodel, i try many sample but i have never have the result, any help please, this my code

var model = new AggregationViewModel();
var loadDataTasks = new Task[]

 Task.Run(async () =>model.Alive = await _repository.GetCountAsync<filter>(Predicate)),
 Task.Run(async () => model.Delay = await _repository.GetCountAsync<Flight>(predicate.And(x => x.Status == "refused")))
;
try

 await Task.WhenAll(loadDataTasks);
 foreach (var item in loadDataTasks)
 

 

catch (Exception ex)

c# .net asynchronous async-await

share|improve this question

edited Mar 24 at 18:25

RAM

8,25754061

asked Mar 24 at 18:01

user1428798user1428798

71131841

var model = new AggregationViewModel();
var loadDataTasks = new Task[]

 Task.Run(async () =>model.Alive = await _repository.GetCountAsync<filter>(Predicate)),
 Task.Run(async () => model.Delay = await _repository.GetCountAsync<Flight>(predicate.And(x => x.Status == "refused")))
;
try

 await Task.WhenAll(loadDataTasks);
 foreach (var item in loadDataTasks)
 

 

catch (Exception ex)

share|improve this question

edited Mar 24 at 18:25

RAM

8,25754061

asked Mar 24 at 18:01

user1428798user1428798

71131841

share|improve this question

edited Mar 24 at 18:25

RAM

8,25754061

asked Mar 24 at 18:01

user1428798user1428798

71131841

edited Mar 24 at 18:25

RAM

8,25754061

edited Mar 24 at 18:25

RAM

8,25754061

asked Mar 24 at 18:01

user1428798user1428798

71131841

asked Mar 24 at 18:01

user1428798user1428798

71131841

2 Answers
2

active

oldest

votes

0

Check this out:

 var task1 = _repository.GetCountAsync<filter>(Predicate);
 var task2 = _repository.GetCountAsync<Flight>(predicate.And(x => x.Status == "refused"));

 await Task.WhenAll(task1, task2); //wait both tasks to finish

 model.Alive = await task1;
 model.Delay = await task2;

PS: the function, which the above code is placed, is needed to be async for the above scenario.

share|improve this answer

edited Mar 24 at 20:53

answered Mar 24 at 18:11

Derviş KayımbaşıoğluDerviş Kayımbaşıoğlu

16.1k22042

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  There's a typo: WaitAll -> WhenAll
  
  – tukaef
  Mar 24 at 18:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i can't add await before WaitAll and i had never the result
  
  – user1428798
  Mar 24 at 19:03
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  yes, It is needed to be WhenAll sorry for that
  
  – Derviş Kayımbaşıoğlu
  Mar 24 at 20:53
  

  
  
  
  

add a comment | 

0

Try this code:

var model = new AggregationViewModel();

//----------------------------------------
var tasks = new List<Task<int>>();
//Add CountA
tasks.Add(_repository.GetCountAsync<filter>(Predicate));
//Add CountB
tasks.Add(_repository.GetCountAsync<Flight>(predicate.And(x => x.Status == "refused")));

//----------------------------------------
// Create a task with "allTasks" name to wait to complete all tasks
Task allTasks = Task.WhenAll(tasks);
try 
 // Wait to compelete "allTask"
 allTasks.Wait();

catch(AggregateException) 


//----------------------------------------
//Working on the results

if (allTasks.Status == TaskStatus.RanToCompletion) 
 model.CountA=allTasks.Result[0]
 model.CountB=allTasks.Result[1]

// Display information on faulted tasks.
else 
 foreach (var t in tasks) 
 Console.WriteLine("Task 0: 1", t.Id, t.Status);
 

share|improve this answer

edited Mar 24 at 19:57

answered Mar 24 at 18:56

RAMRAM

8,25754061

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  what's t in the if please?
  
  – user1428798
  Mar 24 at 19:08
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @user1428798, I have used allTasks in the condition section of the if block. Also t variable in for block points to each one of your defined tasks. Do you have any problem?
  
  – RAM
  Mar 24 at 19:42
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  in the first part is not defined in the if
  
  – user1428798
  Mar 24 at 19:50
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Sorry I corrected it to allTasks. Check it now please.
  
  – RAM
  Mar 24 at 19:57
  

  
  
  
  

add a comment | 

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0

Check this out:

 var task1 = _repository.GetCountAsync<filter>(Predicate);
 var task2 = _repository.GetCountAsync<Flight>(predicate.And(x => x.Status == "refused"));

 await Task.WhenAll(task1, task2); //wait both tasks to finish

 model.Alive = await task1;
 model.Delay = await task2;

PS: the function, which the above code is placed, is needed to be async for the above scenario.

share|improve this answer

edited Mar 24 at 20:53

answered Mar 24 at 18:11

Derviş KayımbaşıoğluDerviş Kayımbaşıoğlu

16.1k22042

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  There's a typo: WaitAll -> WhenAll
  
  – tukaef
  Mar 24 at 18:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i can't add await before WaitAll and i had never the result
  
  – user1428798
  Mar 24 at 19:03
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  yes, It is needed to be WhenAll sorry for that
  
  – Derviş Kayımbaşıoğlu
  Mar 24 at 20:53
  

  
  
  
  

add a comment | 

0

Check this out:

 var task1 = _repository.GetCountAsync<filter>(Predicate);
 var task2 = _repository.GetCountAsync<Flight>(predicate.And(x => x.Status == "refused"));

 await Task.WhenAll(task1, task2); //wait both tasks to finish

 model.Alive = await task1;
 model.Delay = await task2;

PS: the function, which the above code is placed, is needed to be async for the above scenario.

share|improve this answer

edited Mar 24 at 20:53

answered Mar 24 at 18:11

Derviş KayımbaşıoğluDerviş Kayımbaşıoğlu

16.1k22042

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  There's a typo: WaitAll -> WhenAll
  
  – tukaef
  Mar 24 at 18:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i can't add await before WaitAll and i had never the result
  
  – user1428798
  Mar 24 at 19:03
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  yes, It is needed to be WhenAll sorry for that
  
  – Derviş Kayımbaşıoğlu
  Mar 24 at 20:53
  

  
  
  
  

add a comment | 

Check this out:

 var task1 = _repository.GetCountAsync<filter>(Predicate);
 var task2 = _repository.GetCountAsync<Flight>(predicate.And(x => x.Status == "refused"));

 await Task.WhenAll(task1, task2); //wait both tasks to finish

 model.Alive = await task1;
 model.Delay = await task2;

PS: the function, which the above code is placed, is needed to be async for the above scenario.

share|improve this answer

edited Mar 24 at 20:53

answered Mar 24 at 18:11

Derviş KayımbaşıoğluDerviş Kayımbaşıoğlu

16.1k22042

 var task1 = _repository.GetCountAsync<filter>(Predicate);
 var task2 = _repository.GetCountAsync<Flight>(predicate.And(x => x.Status == "refused"));

 await Task.WhenAll(task1, task2); //wait both tasks to finish

 model.Alive = await task1;
 model.Delay = await task2;

share|improve this answer

edited Mar 24 at 20:53

answered Mar 24 at 18:11

Derviş KayımbaşıoğluDerviş Kayımbaşıoğlu

16.1k22042

answered Mar 24 at 18:11

Derviş KayımbaşıoğluDerviş Kayımbaşıoğlu

16.1k22042

answered Mar 24 at 18:11

Derviş KayımbaşıoğluDerviş Kayımbaşıoğlu

16.1k22042

0

Try this code:

var model = new AggregationViewModel();

//----------------------------------------
var tasks = new List<Task<int>>();
//Add CountA
tasks.Add(_repository.GetCountAsync<filter>(Predicate));
//Add CountB
tasks.Add(_repository.GetCountAsync<Flight>(predicate.And(x => x.Status == "refused")));

//----------------------------------------
// Create a task with "allTasks" name to wait to complete all tasks
Task allTasks = Task.WhenAll(tasks);
try 
 // Wait to compelete "allTask"
 allTasks.Wait();

catch(AggregateException) 


//----------------------------------------
//Working on the results

if (allTasks.Status == TaskStatus.RanToCompletion) 
 model.CountA=allTasks.Result[0]
 model.CountB=allTasks.Result[1]

// Display information on faulted tasks.
else 
 foreach (var t in tasks) 
 Console.WriteLine("Task 0: 1", t.Id, t.Status);
 

share|improve this answer

edited Mar 24 at 19:57

answered Mar 24 at 18:56

RAMRAM

8,25754061

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  what's t in the if please?
  
  – user1428798
  Mar 24 at 19:08
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @user1428798, I have used allTasks in the condition section of the if block. Also t variable in for block points to each one of your defined tasks. Do you have any problem?
  
  – RAM
  Mar 24 at 19:42
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  in the first part is not defined in the if
  
  – user1428798
  Mar 24 at 19:50
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Sorry I corrected it to allTasks. Check it now please.
  
  – RAM
  Mar 24 at 19:57
  

  
  
  
  

add a comment | 

0

Try this code:

var model = new AggregationViewModel();

//----------------------------------------
var tasks = new List<Task<int>>();
//Add CountA
tasks.Add(_repository.GetCountAsync<filter>(Predicate));
//Add CountB
tasks.Add(_repository.GetCountAsync<Flight>(predicate.And(x => x.Status == "refused")));

//----------------------------------------
// Create a task with "allTasks" name to wait to complete all tasks
Task allTasks = Task.WhenAll(tasks);
try 
 // Wait to compelete "allTask"
 allTasks.Wait();

catch(AggregateException) 


//----------------------------------------
//Working on the results

if (allTasks.Status == TaskStatus.RanToCompletion) 
 model.CountA=allTasks.Result[0]
 model.CountB=allTasks.Result[1]

// Display information on faulted tasks.
else 
 foreach (var t in tasks) 
 Console.WriteLine("Task 0: 1", t.Id, t.Status);
 

share|improve this answer

edited Mar 24 at 19:57

answered Mar 24 at 18:56

RAMRAM

8,25754061

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  what's t in the if please?
  
  – user1428798
  Mar 24 at 19:08
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @user1428798, I have used allTasks in the condition section of the if block. Also t variable in for block points to each one of your defined tasks. Do you have any problem?
  
  – RAM
  Mar 24 at 19:42
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  in the first part is not defined in the if
  
  – user1428798
  Mar 24 at 19:50
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Sorry I corrected it to allTasks. Check it now please.
  
  – RAM
  Mar 24 at 19:57
  

  
  
  
  

add a comment | 

Try this code:

var model = new AggregationViewModel();

//----------------------------------------
var tasks = new List<Task<int>>();
//Add CountA
tasks.Add(_repository.GetCountAsync<filter>(Predicate));
//Add CountB
tasks.Add(_repository.GetCountAsync<Flight>(predicate.And(x => x.Status == "refused")));

//----------------------------------------
// Create a task with "allTasks" name to wait to complete all tasks
Task allTasks = Task.WhenAll(tasks);
try 
 // Wait to compelete "allTask"
 allTasks.Wait();

catch(AggregateException) 


//----------------------------------------
//Working on the results

if (allTasks.Status == TaskStatus.RanToCompletion) 
 model.CountA=allTasks.Result[0]
 model.CountB=allTasks.Result[1]

// Display information on faulted tasks.
else 
 foreach (var t in tasks) 
 Console.WriteLine("Task 0: 1", t.Id, t.Status);
 

share|improve this answer

edited Mar 24 at 19:57

answered Mar 24 at 18:56

RAMRAM

8,25754061

var model = new AggregationViewModel();

//----------------------------------------
var tasks = new List<Task<int>>();
//Add CountA
tasks.Add(_repository.GetCountAsync<filter>(Predicate));
//Add CountB
tasks.Add(_repository.GetCountAsync<Flight>(predicate.And(x => x.Status == "refused")));

//----------------------------------------
// Create a task with "allTasks" name to wait to complete all tasks
Task allTasks = Task.WhenAll(tasks);
try 
 // Wait to compelete "allTask"
 allTasks.Wait();

catch(AggregateException) 


//----------------------------------------
//Working on the results

if (allTasks.Status == TaskStatus.RanToCompletion) 
 model.CountA=allTasks.Result[0]
 model.CountB=allTasks.Result[1]

// Display information on faulted tasks.
else 
 foreach (var t in tasks) 
 Console.WriteLine("Task 0: 1", t.Id, t.Status);
 

share|improve this answer

edited Mar 24 at 19:57

answered Mar 24 at 18:56

RAMRAM

8,25754061

answered Mar 24 at 18:56

RAMRAM

8,25754061

answered Mar 24 at 18:56

RAMRAM

8,25754061