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TaskFactory.ContinueWhenAll Method (Task(), Action(Of Task()))

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

Namespace:  System.Threading.Tasks
Assembly:  mscorlib (in mscorlib.dll)

Public Function ContinueWhenAll ( _
	tasks As Task(), _
	continuationAction As Action(Of Task()) _
) As Task


Type: System.Threading.Tasks.Task()

The array of tasks from which to continue.

Type: System.Action(Of Task())

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

Return Value

Type: System.Threading.Tasks.Task
The new continuation task.


An element in the tasks array has been disposed.


The tasks array is Nothing.


The continuationAction argument is Nothing.


The tasks array is empty or contains a null value.

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.

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.

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()
                                             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))

      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  
                                                              Console.WriteLine("{0,-25} {1,6} total words", 
                                                                                String.Format("{0} files", nSuccessfulTasks), 
                                                              If nFailed > 0 Then
                                                                 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)
   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.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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