TaskFactory.ContinueWhenAll Method

Definition

Creates a continuation task that starts when a set of specified tasks has completed.

Overloads

ContinueWhenAll(Task[], Action<Task[]>)

Creates a continuation task that starts when a set of specified tasks has completed.

ContinueWhenAll(Task[], Action<Task[]>, CancellationToken)

Creates a continuation task that starts when a set of specified tasks has completed.

ContinueWhenAll(Task[], Action<Task[]>, TaskContinuationOptions)

Creates a continuation task that starts when a set of specified tasks has completed.

ContinueWhenAll(Task[], Action<Task[]>, CancellationToken, TaskContinuationOptions, TaskScheduler)

Creates a continuation task that starts when a set of specified tasks has completed.

ContinueWhenAll<TAntecedentResult,TResult>(Task<TAntecedentResult>[], Func<Task<TAntecedentResult>[],TResult>, CancellationToken, TaskContinuationOptions, TaskScheduler)

Creates a continuation task that starts when a set of specified tasks has completed.

ContinueWhenAll<TAntecedentResult,TResult>(Task<TAntecedentResult>[], Func<Task<TAntecedentResult>[],TResult>, TaskContinuationOptions)

Creates a continuation task that starts when a set of specified tasks has completed.

ContinueWhenAll<TAntecedentResult,TResult>(Task<TAntecedentResult>[], Func<Task<TAntecedentResult>[],TResult>, CancellationToken)

Creates a continuation task that starts when a set of specified tasks has completed.

ContinueWhenAll<TAntecedentResult,TResult>(Task<TAntecedentResult>[], Func<Task<TAntecedentResult>[],TResult>)

Creates a continuation task that starts when a set of specified tasks has completed.

ContinueWhenAll<TAntecedentResult>(Task<TAntecedentResult>[], Action<Task<TAntecedentResult>[]>, CancellationToken, TaskContinuationOptions, TaskScheduler)

Creates a continuation task that starts when a set of specified tasks has completed.

ContinueWhenAll<TAntecedentResult>(Task<TAntecedentResult>[], Action<Task<TAntecedentResult>[]>, TaskContinuationOptions)

Creates a continuation task that starts when a set of specified tasks has completed.

ContinueWhenAll<TAntecedentResult>(Task<TAntecedentResult>[], Action<Task<TAntecedentResult>[]>, CancellationToken)

Creates a continuation task that starts when a set of specified tasks has completed.

ContinueWhenAll<TAntecedentResult>(Task<TAntecedentResult>[], Action<Task<TAntecedentResult>[]>)

Creates a continuation task that starts when a set of specified tasks has completed.

ContinueWhenAll<TResult>(Task[], Func<Task[],TResult>)

Creates a continuation task that starts when a set of specified tasks has completed.

ContinueWhenAll<TResult>(Task[], Func<Task[],TResult>, CancellationToken)

Creates a continuation task that starts when a set of specified tasks has completed.

ContinueWhenAll<TResult>(Task[], Func<Task[],TResult>, TaskContinuationOptions)

Creates a continuation task that starts when a set of specified tasks has completed.

ContinueWhenAll<TResult>(Task[], Func<Task[],TResult>, CancellationToken, TaskContinuationOptions, TaskScheduler)

Creates a continuation task that starts when a set of specified tasks has completed.

ContinueWhenAll(Task[], Action<Task[]>)

Creates a continuation task that starts when a set of specified tasks has completed.

public System.Threading.Tasks.Task ContinueWhenAll (System.Threading.Tasks.Task[] tasks, Action<System.Threading.Tasks.Task[]> continuationAction);
Parameters
tasks
Task[]

The array of tasks from which to continue.

continuationAction
Action<Task[]>

The action delegate to execute when all tasks in the tasks array have completed.

Returns

The new continuation task.

Exceptions

An element in the tasks array has been disposed.

The tasks array is null.

-or-

The continuationAction argument is null.

The tasks array is empty or contains a null value.

Examples

The following example launches separate tasks that use a regular expression to count the number of words in a set of text files. The ContinueWhenAll method is used to launch a task that displays the total word count when all the antecedent tasks have completed.

using System;
using System.Collections.Generic;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using System.Text.RegularExpressions;

public class Example
{
   public static void Main()
   {
      string[] filenames = { "chapter1.txt", "chapter2.txt", 
                             "chapter3.txt", "chapter4.txt",
                             "chapter5.txt" };
      string pattern = @"\b\w+\b";
      var tasks = new List<Task>();  
      int totalWords = 0;
        
      // Determine the number of words in each file.
      foreach (var filename in filenames) 
         tasks.Add( Task.Factory.StartNew( fn => { if (! File.Exists(fn.ToString()))
                                                      throw new FileNotFoundException("{0} does not exist.", filename);

                                                   StreamReader sr = new StreamReader(fn.ToString());
                                                   String content = sr.ReadToEnd();
                                                   sr.Close();
                                                   int words = Regex.Matches(content, pattern).Count;
                                                   Interlocked.Add(ref totalWords, words); 
                                                   Console.WriteLine("{0,-25} {1,6:N0} words", fn, words); }, 
                                           filename));

      var finalTask = Task.Factory.ContinueWhenAll(tasks.ToArray(), wordCountTasks => {
                                                    int nSuccessfulTasks = 0;
                                                    int nFailed = 0;
                                                    int nFileNotFound = 0;
                                                    foreach (var t in wordCountTasks) {
                                                       if (t.Status == TaskStatus.RanToCompletion) 
                                                          nSuccessfulTasks++;
                                                       
                                                       if (t.Status == TaskStatus.Faulted) {
                                                          nFailed++;  
                                                          t.Exception.Handle( (e) => { 
                                                             if (e is FileNotFoundException)
                                                                nFileNotFound++;
                                                             return true;   
                                                          });
                                                       } 
                                                    }   
                                                    Console.WriteLine("\n{0,-25} {1,6} total words\n", 
                                                                      String.Format("{0} files", nSuccessfulTasks), 
                                                                      totalWords); 
                                                    if (nFailed > 0) {
                                                       Console.WriteLine("{0} tasks failed for the following reasons:", nFailed);
                                                       Console.WriteLine("   File not found:    {0}", nFileNotFound);
                                                       if (nFailed != nFileNotFound)
                                                          Console.WriteLine("   Other:          {0}", nFailed - nFileNotFound);
                                                    } 
                                                    });  
      finalTask.Wait();                                                                  
   }
}
// The example displays output like the following:
//       chapter2.txt               1,585 words
//       chapter1.txt               4,012 words
//       chapter5.txt               4,660 words
//       chapter3.txt               7,481 words
//       
//       4 files                    17738 total words
//       
//       1 tasks failed for the following reasons:
//          File not found:    1
Imports System.Collections.Generic
Imports System.IO
Imports System.Threading
Imports System.Threading.Tasks
Imports System.Text.RegularExpressions

Module Example
   Dim totalWords As Integer = 0
   
   Public Sub Main()
      Dim filenames() As String = { "chapter1.txt", "chapter2.txt", 
                                    "chapter3.txt", "chapter4.txt",
                                    "chapter5.txt" }
      Dim pattern As String = "\b\w+\b"
      Dim tasks As New List(Of Task)()  
        
      ' Determine the number of words in each file.
      For Each filename In filenames 
         tasks.Add(Task.Factory.StartNew( Sub(fn)
                                             If Not File.Exists(filename)
                                                Throw New FileNotFoundException("{0} does not exist.", filename)
                                             End If
                                             
                                             Dim sr As New StreamReader(fn.ToString())
                                             Dim content As String = sr.ReadToEnd()
                                             sr.Close()
                                             Dim words As Integer = Regex.Matches(content, pattern).Count
                                             Interlocked.Add(totalWords, words) 
                                             Console.WriteLine("{0,-25} {1,6:N0} words", fn, words)
                                          End Sub, filename))
      Next
      
      Dim finalTask As Task = Task.Factory.ContinueWhenAll(tasks.ToArray(), 
                                                           Sub(wordCountTasks As Task() )
                                                              Dim nSuccessfulTasks As Integer = 0
                                                              Dim nFailed As Integer = 0
                                                              Dim nFileNotFound As Integer = 0
                                                              For Each t In wordCountTasks
                                                                 If t.Status = TaskStatus.RanToCompletion Then _ 
                                                                    nSuccessfulTasks += 1
                                                       
                                                                 If t.Status = TaskStatus.Faulted Then
                                                                    nFailed += 1  
                                                                    t.Exception.Handle(Function(e As Exception) 
                                                                                          If TypeOf e Is FileNotFoundException Then
                                                                                             nFileNotFound += 1
                                                                                          End If   
                                                                                          Return True   
                                                                                       End Function)                       
                                                                 End If 
                                                              Next   
                                                              Console.WriteLine()
                                                              Console.WriteLine("{0,-25} {1,6} total words", 
                                                                                String.Format("{0} files", nSuccessfulTasks), 
                                                                                totalWords) 
                                                              If nFailed > 0 Then
                                                                 Console.WriteLine()
                                                                 Console.WriteLine("{0} tasks failed for the following reasons:", nFailed)
                                                                 Console.WriteLine("   File not found:    {0}", nFileNotFound)
                                                                 If nFailed <> nFileNotFound Then
                                                                    Console.WriteLine("   Other:          {0}", nFailed - nFileNotFound)
                                                                 End If 
                                                              End If
                                                           End Sub)
      finalTask.Wait()                                                                  
   End Sub
   
   Private Sub DisplayResult(wordCountTasks As Task())
   End Sub
End Module
' The example displays output like the following:
'       chapter2.txt               1,585 words
'       chapter1.txt               4,012 words
'       chapter5.txt               4,660 words
'       chapter3.txt               7,481 words
'       
'       4 files                    17738 total words
'       
'       1 tasks failed for the following reasons:
'          File not found:    1

The call to the continuation task's Task.Wait method does not allow it to handle exceptions thrown by the antecedent tasks, so the example examines the Task.Status property of each antecedent task to determine whether the task succeeded.

Remarks

The ContinueWhenAll method executes the continuationAction delegate when all tasks in the tasks array have completed, regardless of their completion status.

Exceptions thrown by tasks in the tasks array are not available to the continuation task through structured exception handling. You can determine which exceptions were thrown by examining the Task.Exception property of each task in the tasks array. To use structured exception handling to handle exceptions thrown by tasks in the tasks array, call the Task.WaitAll(Task[]) method.

ContinueWhenAll(Task[], Action<Task[]>, CancellationToken)

Creates a continuation task that starts when a set of specified tasks has completed.

public System.Threading.Tasks.Task ContinueWhenAll (System.Threading.Tasks.Task[] tasks, Action<System.Threading.Tasks.Task[]> continuationAction, System.Threading.CancellationToken cancellationToken);
Parameters
tasks
Task[]

The array of tasks from which to continue.

continuationAction
Action<Task[]>

The action delegate to execute when all tasks in the tasks array have completed.

cancellationToken
CancellationToken

The cancellation token to assign to the new continuation task.

Returns

The new continuation task.

Exceptions

An element in the tasks array has been disposed.

-or-

The CancellationTokenSource that created cancellationToken has already been disposed.

The tasks array is null.

-or-

The continuationAction argument is null.

The tasks array is empty or contains a null value.

Examples

The following example creates a cancellation token, which it passes to separate tasks that use a regular expression to count the number of words in a set of text files. The cancellation token is set if a file cannot be found. The [], Action(Task<xref:System.Threading.Tasks.TaskFactory.ContinueWhenAll%2A> method is used to launch a task that displays the total word count when all the antecedent tasks have completed. If the cancellation token is set, which indicates that one or more tasks have been cancelled, it handles the AggregateException exception and displays an error message.

using System;
using System.Collections.Generic;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using System.Text.RegularExpressions;

public class Example
{
   public static void Main()
   {
      string[] filenames = { "chapter1.txt", "chapter2.txt", 
                             "chapter3.txt", "chapter4.txt",
                             "chapter5.txt" };
      string pattern = @"\b\w+\b";
      var tasks = new List<Task>();  
      CancellationTokenSource source = new CancellationTokenSource();
      CancellationToken token = source.Token;
      int totalWords = 0;
        
      // Determine the number of words in each file.
      foreach (var filename in filenames)
         tasks.Add( Task.Factory.StartNew( fn => { token.ThrowIfCancellationRequested(); 

                                                   if (! File.Exists(fn.ToString())) {
                                                      source.Cancel();
                                                      token.ThrowIfCancellationRequested();
                                                   }
                                                   
                                                   StreamReader sr = new StreamReader(fn.ToString());
                                                   String content = sr.ReadToEnd();
                                                   sr.Close();
                                                   int words = Regex.Matches(content, pattern).Count;
                                                   Interlocked.Add(ref totalWords, words); 
                                                   Console.WriteLine("{0,-25} {1,6:N0} words", fn, words); }, 
                                           filename, token));

      var finalTask = Task.Factory.ContinueWhenAll(tasks.ToArray(), wordCountTasks => {
                                                    if (! token.IsCancellationRequested) 
                                                       Console.WriteLine("\n{0,-25} {1,6} total words\n", 
                                                                         String.Format("{0} files", wordCountTasks.Length), 
                                                                         totalWords); 
                                                   }, token); 
      try {                                                   
         finalTask.Wait();
      }
      catch (AggregateException ae) {
         foreach (Exception inner in ae.InnerExceptions)
            if (inner is TaskCanceledException)
               Console.WriteLine("\nFailure to determine total word count: a task was cancelled.");
            else
               Console.WriteLine("\nFailure caused by {0}", inner.GetType().Name);      
      }
      finally {
         source.Dispose();
      }
   }
}
// The example displays output like the following:
//       chapter2.txt               1,585 words
//       chapter1.txt               4,012 words
//       
//       Failure to determine total word count: a task was cancelled.
Imports System.Collections.Generic
Imports System.IO
Imports System.Threading
Imports System.Threading.Tasks
Imports System.Text.RegularExpressions

Module Example
   Public Sub Main()
      Dim filenames() As String= { "chapter1.txt", "chapter2.txt", 
                                   "chapter3.txt", "chapter4.txt",
                                   "chapter5.txt" }
      Dim pattern As String = "\b\w+\b"
      Dim tasks As New List(Of Task)()  
      Dim source As New CancellationTokenSource()
      Dim token As CancellationToken = source.Token
      Dim totalWords As Integer = 0
        
      ' Determine the number of words in each file.
      For Each filename In filenames
         tasks.Add( Task.Factory.StartNew( Sub(obj As Object)
                                              Dim fn As String = CStr(obj)
                                              token.ThrowIfCancellationRequested() 
                                              If Not File.Exists(fn) Then 
                                                 source.Cancel()
                                                 token.ThrowIfCancellationRequested()
                                              End If        
                                                   
                                              Dim sr As New StreamReader(fn.ToString())
                                              Dim content As String = sr.ReadToEnd()
                                              sr.Close()
                                              Dim words As Integer = Regex.Matches(content, pattern).Count
                                              Interlocked.Add(totalWords, words) 
                                              Console.WriteLine("{0,-25} {1,6:N0} words", fn, words) 
                                           End Sub, filename, token))
      Next
      
      Dim finalTask As Task = Task.Factory.ContinueWhenAll(tasks.ToArray(), 
                                                           Sub(wordCountTasks As Task())
                                                              If Not token.IsCancellationRequested Then 
                                                                 Console.WriteLine("\n{0,-25} {1,6} total words\n", 
                                                                                   String.Format("{0} files", wordCountTasks.Length), 
                                                                                   totalWords)
                                                              End If                      
                                                           End Sub, token) 
      Try                                                    
         finalTask.Wait()
      Catch ae As AggregateException 
         For Each inner In ae.InnerExceptions
            Console.WriteLine()
            If TypeOf inner Is TaskCanceledException
               Console.WriteLine("Failure to determine total word count: a task was cancelled.")
            Else
               Console.WriteLine("Failure caused by {0}", inner.GetType().Name)
            End If 
         Next           
      Finally
         source.Dispose()
      End Try                                                                     
   End Sub
End Module
' The example displays output like the following:
'       chapter2.txt               1,585 words
'       chapter1.txt               4,012 words
'       
'       Failure to determine total word count: a task was cancelled.

Remarks

The [], Action(Task<xref:System.Threading.Tasks.TaskFactory.ContinueWhenAll%28System.Threading.Tasks.Task%5B%5D%2CSystem.Action%7BSystem.Threading.Tasks.Task%5B%5D%7D%2CSystem.Threading.CancellationToken%29> method executes the continuationAction delegate when all tasks in the tasks array have completed, regardless of their completion status.

ContinueWhenAll(Task[], Action<Task[]>, TaskContinuationOptions)

Creates a continuation task that starts when a set of specified tasks has completed.

public System.Threading.Tasks.Task ContinueWhenAll (System.Threading.Tasks.Task[] tasks, Action<System.Threading.Tasks.Task[]> continuationAction, System.Threading.Tasks.TaskContinuationOptions continuationOptions);
Parameters
tasks
Task[]

The array of tasks from which to continue.

continuationAction
Action<Task[]>

The action delegate to execute when all tasks in the tasks array have completed.

continuationOptions
TaskContinuationOptions

A bitwise combination of the enumeration values that control the behavior of the new continuation task. The NotOn* and OnlyOn* members are not supported.

Returns

The new continuation task.

Exceptions

An element in the tasks array has been disposed.

The tasks array is null.

-or-

The continuationAction argument is null.

The continuationOptions argument specifies an invalid value.

The tasks array is empty or contains a null value.

ContinueWhenAll(Task[], Action<Task[]>, CancellationToken, TaskContinuationOptions, TaskScheduler)

Creates a continuation task that starts when a set of specified tasks has completed.

public System.Threading.Tasks.Task ContinueWhenAll (System.Threading.Tasks.Task[] tasks, Action<System.Threading.Tasks.Task[]> continuationAction, System.Threading.CancellationToken cancellationToken, System.Threading.Tasks.TaskContinuationOptions continuationOptions, System.Threading.Tasks.TaskScheduler scheduler);
Parameters
tasks
Task[]

The array of tasks from which to continue.

continuationAction
Action<Task[]>

The action delegate to execute when all tasks in the tasks array have completed.

cancellationToken
CancellationToken

The cancellation token to assign to the new continuation task.

continuationOptions
TaskContinuationOptions

A bitwise combination of the enumeration values that control the behavior of the new continuation task.

scheduler
TaskScheduler

The object that is used to schedule the new continuation task.

Returns

The new continuation task.

Exceptions

The tasks array is null.

-or-

The continuationAction argument is null.

-or-

The scheduler argument is null.

The tasks array is empty or contains a null value.

ContinueWhenAll<TAntecedentResult,TResult>(Task<TAntecedentResult>[], Func<Task<TAntecedentResult>[],TResult>, CancellationToken, TaskContinuationOptions, TaskScheduler)

Creates a continuation task that starts when a set of specified tasks has completed.

public System.Threading.Tasks.Task<TResult> ContinueWhenAll<TAntecedentResult,TResult> (System.Threading.Tasks.Task<TAntecedentResult>[] tasks, Func<System.Threading.Tasks.Task<TAntecedentResult>[],TResult> continuationFunction, System.Threading.CancellationToken cancellationToken, System.Threading.Tasks.TaskContinuationOptions continuationOptions, System.Threading.Tasks.TaskScheduler scheduler);
Type Parameters
TAntecedentResult

The type of the result of the antecedent tasks.

TResult

The type of the result that is returned by the continuationFunction delegate and associated with the created task.

Parameters
tasks
Task<TAntecedentResult>[]

The array of tasks from which to continue.

continuationFunction
Func<Task<TAntecedentResult>[],TResult>

The function delegate to execute asynchronously when all tasks in the tasks array have completed.

cancellationToken
CancellationToken

The cancellation token to assign to the new continuation task.

continuationOptions
TaskContinuationOptions

A bitwise combination of the enumeration values that control the behavior of the new continuation task. The NotOn* and OnlyOn* members are not supported.

scheduler
TaskScheduler

The object that is used to schedule the new continuation task.

Returns

The new continuation task.

Exceptions

The tasks array is null.

-or-

The continuationFunction argument is null.

-or-

The scheduler argument is null.

The tasks array is empty or contains a null value.

The continuationOptions argument specifies an invalid value.

An element in the tasks array has been disposed.

-or-

The CancellationTokenSource that created cancellationToken has already been disposed.

ContinueWhenAll<TAntecedentResult,TResult>(Task<TAntecedentResult>[], Func<Task<TAntecedentResult>[],TResult>, TaskContinuationOptions)

Creates a continuation task that starts when a set of specified tasks has completed.

public System.Threading.Tasks.Task<TResult> ContinueWhenAll<TAntecedentResult,TResult> (System.Threading.Tasks.Task<TAntecedentResult>[] tasks, Func<System.Threading.Tasks.Task<TAntecedentResult>[],TResult> continuationFunction, System.Threading.Tasks.TaskContinuationOptions continuationOptions);
Type Parameters
TAntecedentResult

The type of the result of the antecedent tasks.

TResult

The type of the result that is returned by the continuationFunction delegate and associated with the created task.

Parameters
tasks
Task<TAntecedentResult>[]

The array of tasks from which to continue.

continuationFunction
Func<Task<TAntecedentResult>[],TResult>

The function delegate to execute asynchronously when all tasks in the tasks array have completed.

continuationOptions
TaskContinuationOptions

A bitwise combination of the enumeration values that control the behavior of the new continuation task. The NotOn* and OnlyOn* members are not supported.

Returns

The new continuation task.

Exceptions

An element in the tasks array has been disposed.

The tasks array is null.

-or-

The continuationFunction argument is null.

The continuationOptions argument specifies an invalid value.

The tasks array is empty or contains a null value.

ContinueWhenAll<TAntecedentResult,TResult>(Task<TAntecedentResult>[], Func<Task<TAntecedentResult>[],TResult>, CancellationToken)

Creates a continuation task that starts when a set of specified tasks has completed.

public System.Threading.Tasks.Task<TResult> ContinueWhenAll<TAntecedentResult,TResult> (System.Threading.Tasks.Task<TAntecedentResult>[] tasks, Func<System.Threading.Tasks.Task<TAntecedentResult>[],TResult> continuationFunction, System.Threading.CancellationToken cancellationToken);
Type Parameters
TAntecedentResult

The type of the result of the antecedent tasks.

TResult

The type of the result that is returned by the continuationFunction delegate and associated with the created task.

Parameters
tasks
Task<TAntecedentResult>[]

The array of tasks from which to continue.

continuationFunction
Func<Task<TAntecedentResult>[],TResult>

The function delegate to execute asynchronously when all tasks in the tasks array have completed.

cancellationToken
CancellationToken

The cancellation token to assign to the new continuation task.

Returns

The new continuation task.

Exceptions

An element in the tasks array has been disposed.

-or-

The CancellationTokenSource that created cancellationToken has already been disposed.

The tasks array is null.

-or-

The continuationFunction argument is null.

The tasks array is empty or contains a null value.

ContinueWhenAll<TAntecedentResult,TResult>(Task<TAntecedentResult>[], Func<Task<TAntecedentResult>[],TResult>)

Creates a continuation task that starts when a set of specified tasks has completed.

public System.Threading.Tasks.Task<TResult> ContinueWhenAll<TAntecedentResult,TResult> (System.Threading.Tasks.Task<TAntecedentResult>[] tasks, Func<System.Threading.Tasks.Task<TAntecedentResult>[],TResult> continuationFunction);
Type Parameters
TAntecedentResult

The type of the result of the antecedent tasks.

TResult

The type of the result that is returned by the continuationFunction delegate and associated with the created task.

Parameters
tasks
Task<TAntecedentResult>[]

The array of tasks from which to continue.

continuationFunction
Func<Task<TAntecedentResult>[],TResult>

The function delegate to execute asynchronously when all tasks in the tasks array have completed.

Returns

The new continuation task.

Exceptions

An element in the tasks array has been disposed.

The tasks array is null.

-or-

The continuationFunction argument is null.

The tasks array is empty or contains a null value.

ContinueWhenAll<TAntecedentResult>(Task<TAntecedentResult>[], Action<Task<TAntecedentResult>[]>, CancellationToken, TaskContinuationOptions, TaskScheduler)

Creates a continuation task that starts when a set of specified tasks has completed.

public System.Threading.Tasks.Task ContinueWhenAll<TAntecedentResult> (System.Threading.Tasks.Task<TAntecedentResult>[] tasks, Action<System.Threading.Tasks.Task<TAntecedentResult>[]> continuationAction, System.Threading.CancellationToken cancellationToken, System.Threading.Tasks.TaskContinuationOptions continuationOptions, System.Threading.Tasks.TaskScheduler scheduler);
Type Parameters
TAntecedentResult

The type of the result of the antecedent tasks.

Parameters
tasks
Task<TAntecedentResult>[]

The array of tasks from which to continue.

continuationAction
Action<Task<TAntecedentResult>[]>

The action delegate to execute when all tasks in the tasks array have completed.

cancellationToken
CancellationToken

The cancellation token to assign to the new continuation task.

continuationOptions
TaskContinuationOptions

A bitwise combination of the enumeration values that control the behavior of the new continuation task. The NotOn* and OnlyOn* members are not supported.

scheduler
TaskScheduler

The object that is used to schedule the new continuation task.

Returns

The new continuation task.

Exceptions

The tasks array is null.

-or-

The continuationAction argument is null.

-or-

The scheduler argument is null.

The tasks array is empty or contains a null value.

ContinueWhenAll<TAntecedentResult>(Task<TAntecedentResult>[], Action<Task<TAntecedentResult>[]>, TaskContinuationOptions)

Creates a continuation task that starts when a set of specified tasks has completed.

public System.Threading.Tasks.Task ContinueWhenAll<TAntecedentResult> (System.Threading.Tasks.Task<TAntecedentResult>[] tasks, Action<System.Threading.Tasks.Task<TAntecedentResult>[]> continuationAction, System.Threading.Tasks.TaskContinuationOptions continuationOptions);
Type Parameters
TAntecedentResult

The type of the result of the antecedent tasks.

Parameters
tasks
Task<TAntecedentResult>[]

The array of tasks from which to continue.

continuationAction
Action<Task<TAntecedentResult>[]>

The action delegate to execute when all tasks in the tasks array have completed.

continuationOptions
TaskContinuationOptions

A bitwise combination of the enumeration values that control the behavior of the new continuation task. The NotOn* and OnlyOn* members are not supported.

Returns

The new continuation task.

Exceptions

An element in the tasks array has been disposed.

The tasks array is null.

-or-

The continuationAction argument is null.

The continuationOptions argument specifies an invalid value.

The tasks array is empty or contains a null value.

ContinueWhenAll<TAntecedentResult>(Task<TAntecedentResult>[], Action<Task<TAntecedentResult>[]>, CancellationToken)

Creates a continuation task that starts when a set of specified tasks has completed.

public System.Threading.Tasks.Task ContinueWhenAll<TAntecedentResult> (System.Threading.Tasks.Task<TAntecedentResult>[] tasks, Action<System.Threading.Tasks.Task<TAntecedentResult>[]> continuationAction, System.Threading.CancellationToken cancellationToken);
Type Parameters
TAntecedentResult

The type of the result of the antecedent tasks.

Parameters
tasks
Task<TAntecedentResult>[]

The array of tasks from which to continue.

continuationAction
Action<Task<TAntecedentResult>[]>

The action delegate to execute when all tasks in the tasks array have completed.

cancellationToken
CancellationToken

The cancellation token to assign to the new continuation task.

Returns

The new continuation task.

Exceptions

An element in the tasks array has been disposed.

-or-

The CancellationTokenSource that created cancellationToken has already been disposed.

The tasks array is null.

-or-

The continuationAction argument is null.

The tasks array is empty or contains a null value.

ContinueWhenAll<TAntecedentResult>(Task<TAntecedentResult>[], Action<Task<TAntecedentResult>[]>)

Creates a continuation task that starts when a set of specified tasks has completed.

public System.Threading.Tasks.Task ContinueWhenAll<TAntecedentResult> (System.Threading.Tasks.Task<TAntecedentResult>[] tasks, Action<System.Threading.Tasks.Task<TAntecedentResult>[]> continuationAction);
Type Parameters
TAntecedentResult

The type of the result of the antecedent tasks.

Parameters
tasks
Task<TAntecedentResult>[]

The array of tasks from which to continue.

continuationAction
Action<Task<TAntecedentResult>[]>

The action delegate to execute when all tasks in the tasks array have completed.

Returns

The new continuation task.

Exceptions

An element in the tasks array has been disposed.

The tasks array is null.

-or-

The continuationAction argument is null.

The tasks array is empty or contains a null value.

ContinueWhenAll<TResult>(Task[], Func<Task[],TResult>)

Creates a continuation task that starts when a set of specified tasks has completed.

public System.Threading.Tasks.Task<TResult> ContinueWhenAll<TResult> (System.Threading.Tasks.Task[] tasks, Func<System.Threading.Tasks.Task[],TResult> continuationFunction);
Type Parameters
TResult

The type of the result that is returned by the continuationFunction delegate and associated with the created task.

Parameters
tasks
Task[]

The array of tasks from which to continue.

continuationFunction
Func<Task[],TResult>

The function delegate to execute asynchronously when all tasks in the tasks array have completed.

Returns

The new continuation task.

Exceptions

An element in the tasks array has been disposed.

The tasks array is null.

-or-

The continuationFunction argument is null.

The tasks array is empty or contains a null value.

ContinueWhenAll<TResult>(Task[], Func<Task[],TResult>, CancellationToken)

Creates a continuation task that starts when a set of specified tasks has completed.

public System.Threading.Tasks.Task<TResult> ContinueWhenAll<TResult> (System.Threading.Tasks.Task[] tasks, Func<System.Threading.Tasks.Task[],TResult> continuationFunction, System.Threading.CancellationToken cancellationToken);
Type Parameters
TResult

The type of the result that is returned by the continuationFunction delegate and associated with the created task.

Parameters
tasks
Task[]

The array of tasks from which to continue.

continuationFunction
Func<Task[],TResult>

The function delegate to execute asynchronously when all tasks in the tasks array have completed.

cancellationToken
CancellationToken

The cancellation token to assign to the new continuation task.

Returns

The new continuation task.

Exceptions

An element in the tasks array has been disposed.

-or-

The CancellationTokenSource that created cancellationToken has already been disposed.

The tasks array is null.

-or-

The continuationFunction argument is null.

The tasks array is empty or contains a null value.

ContinueWhenAll<TResult>(Task[], Func<Task[],TResult>, TaskContinuationOptions)

Creates a continuation task that starts when a set of specified tasks has completed.

public System.Threading.Tasks.Task<TResult> ContinueWhenAll<TResult> (System.Threading.Tasks.Task[] tasks, Func<System.Threading.Tasks.Task[],TResult> continuationFunction, System.Threading.Tasks.TaskContinuationOptions continuationOptions);
Type Parameters
TResult

The type of the result that is returned by the continuationFunction delegate and associated with the created task.

Parameters
tasks
Task[]

The array of tasks from which to continue.

continuationFunction
Func<Task[],TResult>

The function delegate to execute asynchronously when all tasks in the tasks array have completed.

continuationOptions
TaskContinuationOptions

A bitwise combination of the enumeration values that control the behavior of the new continuation task. The NotOn* and OnlyOn* members are not supported.

Returns

The new continuation task.

Exceptions

An element in the tasks array has been disposed.

The tasks array is null.

-or-

The continuationFunction argument is null.

The continuationOptions argument specifies an invalid value.

The tasks array is empty or contains a null value.

ContinueWhenAll<TResult>(Task[], Func<Task[],TResult>, CancellationToken, TaskContinuationOptions, TaskScheduler)

Creates a continuation task that starts when a set of specified tasks has completed.

public System.Threading.Tasks.Task<TResult> ContinueWhenAll<TResult> (System.Threading.Tasks.Task[] tasks, Func<System.Threading.Tasks.Task[],TResult> continuationFunction, System.Threading.CancellationToken cancellationToken, System.Threading.Tasks.TaskContinuationOptions continuationOptions, System.Threading.Tasks.TaskScheduler scheduler);
Type Parameters
TResult

The type of the result that is returned by the continuationFunction delegate and associated with the created task.

Parameters
tasks
Task[]

The array of tasks from which to continue.

continuationFunction
Func<Task[],TResult>

The function delegate to execute asynchronously when all tasks in the tasks array have completed.

cancellationToken
CancellationToken

The cancellation token to assign to the new continuation task.

continuationOptions
TaskContinuationOptions

A bitwise combination of the enumeration values that control the behavior of the new continuation task. The NotOn* and OnlyOn* members are not supported.

scheduler
TaskScheduler

The object that is used to schedule the new continuation task.

Returns

The new continuation task.

Exceptions

The tasks array is null.

-or-

The continuationFunction argument is null.

-or-

The scheduler argument is null.

The tasks array is empty or contains a null value.

Applies to