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<summary>Provides support for creating and scheduling <see cref="T:System.Threading.Tasks.Task" /> objects.</summary>

<remarks>

<format type="text/markdown"><![CDATA[

## Remarks

.NET provides two factories for creating and scheduling tasks:

- The <xref:System.Threading.Tasks.TaskFactory> class, which creates <xref:System.Threading.Tasks.Task> and <xref:System.Threading.Tasks.Task%601> objects. You can call the overloads of this method to create and execute a task that requires non-default arguments.

> [!WARNING]

> Starting with .NET Framework 4.5, the <xref:System.Threading.Tasks.Task.Run%2A?displayProperty=nameWithType> method provides the easiest way to create a task with default configuration values and start it immediately.

- The <xref:System.Threading.Tasks.TaskFactory%601> class, which creates <xref:System.Threading.Tasks.Task%601> objects.

The <xref:System.Threading.Tasks.TaskFactory> class allows you to do the following:

- Create a task and start it immediately by calling the <xref:System.Threading.Tasks.TaskFactory.StartNew%2A> method.

> [!WARNING]

> Starting with .NET Framework 4.5, the <xref:System.Threading.Tasks.Task.Run%2A?displayProperty=nameWithType> method provides the easiest way to create a task with default configuration values and start it immediately.

- Create a task that starts when any one of the tasks in an array has completed by calling the <xref:System.Threading.Tasks.TaskFactory.ContinueWhenAny%2A> method.

- Create a task that starts when all the tasks in an array have completed by calling the <xref:System.Threading.Tasks.TaskFactory.ContinueWhenAll%2A> method.

The static <xref:System.Threading.Tasks.Task%601.Factory%2A?displayProperty=nameWithType> property returns a default <xref:System.Threading.Tasks.TaskFactory%601> object. You can also call one of the <xref:System.Threading.Tasks.TaskFactory> class constructors to configure the <xref:System.Threading.Tasks.Task> objects that the <xref:System.Threading.Tasks.TaskFactory> class creates. The following example configures a new <xref:System.Threading.Tasks.TaskFactory> object to create tasks that have a specified cancellation token, task creation options, continuation options, and a customized task scheduler.

:::code language="csharp" source="~/snippets/csharp/System.Threading.Tasks/TaskFactory/Overview/program.cs" id="Snippet1":::

:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Misc/tpl_factories/vb/factories_vb.vb" id="Snippet1":::

In most cases, you do not have to instantiate a new <xref:System.Threading.Tasks.TaskFactory> instance. Instead, you can use the <xref:System.Threading.Tasks.Task.Factory%2A?displayProperty=nameWithType> property, which returns a factory object that uses default values. You can then call its methods to start new tasks or define task continuations. For an illustration, see the example.

## Examples

The following example uses the static <xref:System.Threading.Tasks.Task.Factory%2A> property to make two calls to the <xref:System.Threading.Tasks.TaskFactory.StartNew%2A?displayProperty=nameWithType> method. The first populates an array with the names of files in the user's MyDocuments directory, while the second populates an array with the names of subdirectories of the user's MyDocuments directory. It then calls the <xref:System.Threading.Tasks.TaskFactory.ContinueWhenAll%28System.Threading.Tasks.Task%5B%5D%2CSystem.Action%7BSystem.Threading.Tasks.Task%5B%5D%7D%29?displayProperty=nameWithType> method, which displays information about the number of files and directories in the two arrays after the first two tasks have completed execution.

:::code language="csharp" source="~/snippets/csharp/System.Threading.Tasks/Task/Factory/factory1.cs" id="Snippet1":::

:::code language="vb" source="~/snippets/visualbasic/System.Threading.Tasks/Task/Factory/factory1.vb" id="Snippet1":::

]]></format>

</remarks>

<threadsafe>All public and protected members of <see cref="T:System.Threading.Tasks.TaskFactory" /> are thread-safe and may be used concurrently from multiple threads.</threadsafe>

<related type="Article" href="/dotnet/standard/parallel-programming/task-parallel-library-tpl">Task Parallel Library (TPL)</related>

<related type="ExternalDocumentation" href="https://aka.ms/dotnet-parallel-samples">Samples for parallel programming with .NET</related>

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<summary>Initializes a new instance of the <see cref="T:System.Threading.Tasks.TaskFactory" /> class.</summary>

<related type="Article" href="/dotnet/standard/parallel-programming/task-parallel-library-tpl">Task Parallel Library (TPL)</related>

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<summary>Initializes a <see cref="T:System.Threading.Tasks.TaskFactory" /> instance with the default configuration.</summary>

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<format type="text/markdown"><![CDATA[

## Remarks

This constructor creates a <xref:System.Threading.Tasks.TaskFactory> instance with a default configuration. The <xref:System.Threading.Tasks.TaskCreationOptions> property is initialized to <xref:System.Threading.Tasks.TaskCreationOptions.None>, the <xref:System.Threading.Tasks.TaskContinuationOptions> property is initialized to <xref:System.Threading.Tasks.TaskContinuationOptions.None>, and the <xref:System.Threading.Tasks.TaskScheduler> property is initialized to the current scheduler (see <xref:System.Threading.Tasks.TaskScheduler.Current%2A>).

]]></format>

</remarks>

<related type="Article" href="/dotnet/standard/parallel-programming/task-parallel-library-tpl">Task Parallel Library (TPL)</related>

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<Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" />

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<param name="cancellationToken">The <see cref="P:System.Threading.Tasks.TaskFactory.CancellationToken" /> that will be assigned to tasks created by this <see cref="T:System.Threading.Tasks.TaskFactory" /> unless another CancellationToken is explicitly specified while calling the factory methods.</param>

<summary>Initializes a <see cref="T:System.Threading.Tasks.TaskFactory" /> instance with the specified configuration.</summary>

<remarks>

<format type="text/markdown"><![CDATA[

## Remarks

This constructor creates a <xref:System.Threading.Tasks.TaskFactory> instance with a default configuration. The <xref:System.Threading.Tasks.TaskCreationOptions> property is initialized to <xref:System.Threading.Tasks.TaskCreationOptions.None>, the <xref:System.Threading.Tasks.TaskContinuationOptions> property is initialized to <xref:System.Threading.Tasks.TaskContinuationOptions.None>, and the <xref:System.Threading.Tasks.TaskScheduler> property is initialized to the current scheduler (see <xref:System.Threading.Tasks.TaskScheduler.Current%2A>).

]]></format>

</remarks>

<related type="Article" href="/dotnet/standard/parallel-programming/task-parallel-library-tpl">Task Parallel Library (TPL)</related>

<related type="Article" href="/dotnet/standard/threading/cancellation-in-managed-threads">Cancellation</related>

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<param name="scheduler">The <see cref="T:System.Threading.Tasks.TaskScheduler" /> to use to schedule any tasks created with this TaskFactory. A null value indicates that the current TaskScheduler should be used.</param>

<summary>Initializes a <see cref="T:System.Threading.Tasks.TaskFactory" /> instance with the specified configuration.</summary>

<remarks>

<format type="text/markdown"><![CDATA[

## Remarks

With this constructor, the <xref:System.Threading.Tasks.TaskCreationOptions> property is initialized to <xref:System.Threading.Tasks.TaskCreationOptions.None>, the <xref:System.Threading.Tasks.TaskContinuationOptions> property is initialized to <xref:System.Threading.Tasks.TaskContinuationOptions.None>, and the <xref:System.Threading.Tasks.TaskScheduler> property is initialized to `scheduler`, unless it's null, in which case the property is initialized to the current scheduler (see <xref:System.Threading.Tasks.TaskScheduler.Current%2A>).

]]></format>

</remarks>

<altmember cref="T:System.Threading.Tasks.TaskScheduler" />

<related type="Article" href="/dotnet/standard/parallel-programming/task-parallel-library-tpl">Task Parallel Library (TPL)</related>

<related type="Article" href="/dotnet/standard/parallel-programming/chaining-tasks-by-using-continuation-tasks">Chaining Tasks by Using Continuation Tasks</related>

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<param name="creationOptions">The default <see cref="T:System.Threading.Tasks.TaskCreationOptions" /> to use when creating tasks with this TaskFactory.</param>

<param name="continuationOptions">The default <see cref="T:System.Threading.Tasks.TaskContinuationOptions" /> to use when creating continuation tasks with this TaskFactory.</param>

<summary>Initializes a <see cref="T:System.Threading.Tasks.TaskFactory" /> instance with the specified configuration.</summary>

<remarks>

<format type="text/markdown"><![CDATA[

## Remarks

With this constructor, the <xref:System.Threading.Tasks.TaskCreationOptions> property is initialized to `creationOptions`, the <xref:System.Threading.Tasks.TaskContinuationOptions> property is initialized to `continuationOptions`, and the <xref:System.Threading.Tasks.TaskScheduler> property is initialized to the current scheduler (see <xref:System.Threading.Tasks.TaskScheduler.Current%2A>).

]]></format>

</remarks>

<exception cref="T:System.ArgumentOutOfRangeException">The <paramref name="creationOptions" /> argument specifies an invalid <see cref="T:System.Threading.Tasks.TaskCreationOptions" /> value. For more information, see the Remarks for <see cref="M:System.Threading.Tasks.TaskFactory.FromAsync(System.Func{System.AsyncCallback,System.Object,System.IAsyncResult},System.Action{System.IAsyncResult},System.Object,System.Threading.Tasks.TaskCreationOptions)" />.

-or-

The <paramref name="continuationOptions" /> argument specifies an invalid value.</exception>

<related type="Article" href="/dotnet/standard/parallel-programming/task-parallel-library-tpl">Task Parallel Library (TPL)</related>

<related type="Article" href="/dotnet/standard/parallel-programming/chaining-tasks-by-using-continuation-tasks">Chaining Tasks by Using Continuation Tasks</related>

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<Parameters>

<Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" />

<Parameter Name="creationOptions" Type="System.Threading.Tasks.TaskCreationOptions" />

<Parameter Name="continuationOptions" Type="System.Threading.Tasks.TaskContinuationOptions" />

<Parameter Name="scheduler" Type="System.Threading.Tasks.TaskScheduler" />

</Parameters>

<Docs>

<param name="cancellationToken">The default <see cref="P:System.Threading.Tasks.TaskFactory.CancellationToken" /> that will be assigned to tasks created by this <see cref="T:System.Threading.Tasks.TaskFactory" /> unless another CancellationToken is explicitly specified while calling the factory methods.</param>

<param name="creationOptions">The default <see cref="T:System.Threading.Tasks.TaskCreationOptions" /> to use when creating tasks with this TaskFactory.</param>

<param name="continuationOptions">The default <see cref="T:System.Threading.Tasks.TaskContinuationOptions" /> to use when creating continuation tasks with this TaskFactory.</param>

<param name="scheduler">The default <see cref="T:System.Threading.Tasks.TaskScheduler" /> to use to schedule any Tasks created with this TaskFactory. A null value indicates that TaskScheduler.Current should be used.</param>

<summary>Initializes a <see cref="T:System.Threading.Tasks.TaskFactory" /> instance with the specified configuration.</summary>

<remarks>

<format type="text/markdown"><![CDATA[

## Remarks

With this constructor, the <xref:System.Threading.Tasks.TaskCreationOptions> property is initialized to `creationOptions`, the <xref:System.Threading.Tasks.TaskContinuationOptions> property is initialized to `continuationOptions`, and the <xref:System.Threading.Tasks.TaskScheduler> property is initialized to `scheduler`, unless it's null, in which case the property is initialized to the current scheduler (see <xref:System.Threading.Tasks.TaskScheduler.Current%2A>).

]]></format>

</remarks>

<exception cref="T:System.ArgumentOutOfRangeException">The <paramref name="creationOptions" /> argument specifies an invalid <see cref="T:System.Threading.Tasks.TaskCreationOptions" /> value. For more information, see the Remarks for <see cref="M:System.Threading.Tasks.TaskFactory.FromAsync(System.Func{System.AsyncCallback,System.Object,System.IAsyncResult},System.Action{System.IAsyncResult},System.Object,System.Threading.Tasks.TaskCreationOptions)" />.

-or-

The <paramref name="continuationOptions" /> argument specifies an invalid value.</exception>

<related type="Article" href="/dotnet/standard/parallel-programming/task-parallel-library-tpl">Task Parallel Library (TPL)</related>

<related type="Article" href="/dotnet/standard/parallel-programming/chaining-tasks-by-using-continuation-tasks">Chaining Tasks by Using Continuation Tasks</related>

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<ReturnValue>

<ReturnType>System.Threading.CancellationToken</ReturnType>

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<Docs>

<summary>Gets the default cancellation token for this task factory.</summary>

<value>The default task cancellation token for this task factory.</value>

<remarks>

<format type="text/markdown"><![CDATA[

## Remarks

This property returns the default <xref:System.Threading.CancellationToken> that will be assigned to all tasks created by this factory, unless another <xref:System.Threading.CancellationToken> value is explicitly specified during the call to the factory methods.

]]></format>

</remarks>

<related type="Article" href="/dotnet/standard/parallel-programming/task-parallel-library-tpl">Task Parallel Library (TPL)</related>

<related type="Article" href="/dotnet/standard/parallel-programming/chaining-tasks-by-using-continuation-tasks">Chaining Tasks by Using Continuation Tasks</related>

<related type="Article" href="/dotnet/standard/parallel-programming/task-cancellation">Task Cancellation</related>

</Docs>

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<summary>Gets the default task continuation options for this task factory.</summary>

<value>The default task continuation options for this task factory.</value>

<remarks>

<format type="text/markdown"><![CDATA[

## Remarks

The property value is used to create all continuation tasks, unless other options are explicitly specified during calls to this factory's methods.

]]></format>

</remarks>

<related type="Article" href="/dotnet/standard/parallel-programming/task-parallel-library-tpl">Task Parallel Library (TPL)</related>

<related type="Article" href="/dotnet/standard/parallel-programming/chaining-tasks-by-using-continuation-tasks">Chaining Tasks by Using Continuation Tasks</related>

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<summary>Creates a continuation task that starts when a set of specified tasks has completed.</summary>

<related type="ExternalDocumentation" href="https://aka.ms/dotnet-parallel-samples">Samples for parallel programming with .NET</related>

</Docs>

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<Parameter Name="tasks" Type="System.Threading.Tasks.Task[]" />

<Parameter Name="continuationAction" Type="System.Action&lt;System.Threading.Tasks.Task[]&gt;" />

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<param name="tasks">The array of tasks from which to continue.</param>

<param name="continuationAction">The action delegate to execute when all tasks in the <paramref name="tasks" /> array have completed.</param>

<summary>Creates a continuation task that starts when a set of specified tasks has completed.</summary>

<returns>The new continuation task.</returns>

<remarks>

<format type="text/markdown"><![CDATA[

## Remarks

The <xref:System.Threading.Tasks.TaskFactory.ContinueWhenAll%2A> 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 <xref:System.Threading.Tasks.Task.Exception%2A?displayProperty=nameWithType> 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 <xref:System.Threading.Tasks.Task.WaitAll%28System.Threading.Tasks.Task%5B%5D%29?displayProperty=nameWithType> method.

## 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 <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.

:::code language="csharp" source="~/snippets/csharp/System.Threading.Tasks/TaskFactory/ContinueWhenAll/continuewhenall1.cs" id="Snippet1":::

:::code language="vb" source="~/snippets/visualbasic/System.Threading.Tasks/TaskFactory/ContinueWhenAll/continuewhenall1.vb" id="Snippet1":::

The call to the continuation task's <xref:System.Threading.Tasks.Task.Wait%2A?displayProperty=nameWithType> method does not allow it to handle exceptions thrown by the antecedent tasks, so the example examines the <xref:System.Threading.Tasks.Task.Status%2A?displayProperty=nameWithType> property of each antecedent task to determine whether the task succeeded.

]]></format>

</remarks>

<exception cref="T:System.ObjectDisposedException">An element in the <paramref name="tasks" /> array has been disposed.</exception>

<exception cref="T:System.ArgumentNullException">The <paramref name="tasks" /> array is <see langword="null" />.

-or-

The <paramref name="continuationAction" /> argument is <see langword="null" />.</exception>

<exception cref="T:System.ArgumentException">The <paramref name="tasks" /> array is empty or contains a null value.</exception>

<related type="Article" href="/dotnet/standard/parallel-programming/task-parallel-library-tpl">Task Parallel Library (TPL)</related>

<related type="Article" href="/dotnet/standard/parallel-programming/chaining-tasks-by-using-continuation-tasks">Chaining Tasks by Using Continuation Tasks</related>

</Docs>

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<Parameters>

<Parameter Name="tasks" Type="System.Threading.Tasks.Task[]" />

<Parameter Name="continuationAction" Type="System.Action&lt;System.Threading.Tasks.Task[]&gt;" />

<Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" />

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<Docs>

<param name="tasks">The array of tasks from which to continue.</param>

<param name="continuationAction">The action delegate to execute when all tasks in the <paramref name="tasks" /> array have completed.</param>

<param name="cancellationToken">The cancellation token to assign to the new continuation task.</param>

<summary>Creates a continuation task that starts when a set of specified tasks has completed.</summary>

<returns>The new continuation task.</returns>

<remarks>

<format type="text/markdown"><![CDATA[

## Remarks

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

## 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 `ContinueWhenAll(Task[], Action{Task[]}, CancellationToken)` 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 <xref:System.AggregateException> exception and displays an error message.

:::code language="csharp" source="~/snippets/csharp/System.Threading.Tasks/TaskFactory/ContinueWhenAll/continuewhenall2.cs" id="Snippet2":::

:::code language="vb" source="~/snippets/visualbasic/System.Threading.Tasks/TaskFactory/ContinueWhenAll/continuewhenall2.vb" id="Snippet2":::

]]></format>

</remarks>

<exception cref="T:System.ObjectDisposedException">An element in the <paramref name="tasks" /> array has been disposed.

-or-

The <see cref="T:System.Threading.CancellationTokenSource" /> that created <paramref name="cancellationToken" /> has already been disposed.</exception>

<exception cref="T:System.ArgumentNullException">The <paramref name="tasks" /> array is <see langword="null" />.

-or-

The <paramref name="continuationAction" /> argument is <see langword="null" />.</exception>

<exception cref="T:System.ArgumentException">The <paramref name="tasks" /> array is empty or contains a null value.</exception>

<related type="Article" href="/dotnet/standard/parallel-programming/task-parallel-library-tpl">Task Parallel Library (TPL)</related>

<related type="Article" href="/dotnet/standard/parallel-programming/chaining-tasks-by-using-continuation-tasks">Chaining Tasks by Using Continuation Tasks</related>

</Docs>

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<Parameters>

<Parameter Name="tasks" Type="System.Threading.Tasks.Task[]" />

<Parameter Name="continuationAction" Type="System.Action&lt;System.Threading.Tasks.Task[]&gt;" />

<Parameter Name="continuationOptions" Type="System.Threading.Tasks.TaskContinuationOptions" />

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<param name="tasks">The array of tasks from which to continue.</param>

<param name="continuationAction">The action delegate to execute when all tasks in the <paramref name="tasks" /> array have completed.</param>

<param name="continuationOptions">A bitwise combination of the enumeration values that control the behavior of the new continuation task. The NotOn* and OnlyOn* members are not supported.</param>

<summary>Creates a continuation task that starts when a set of specified tasks has completed.</summary>

<returns>The new continuation task.</returns>

<remarks>

<format type="text/markdown"><![CDATA[

## Remarks

The NotOn\* and OnlyOn\* <xref:System.Threading.Tasks.TaskContinuationOptions>, which constrain for which <xref:System.Threading.Tasks.TaskStatus> states a continuation will be executed, are illegal with `ContinueWhenAll`.

]]></format>

</remarks>

<exception cref="T:System.ObjectDisposedException">An element in the <paramref name="tasks" /> array has been disposed.</exception>

<exception cref="T:System.ArgumentNullException">The <paramref name="tasks" /> array is <see langword="null" />.

-or-

The <paramref name="continuationAction" /> argument is <see langword="null" />.</exception>

<exception cref="T:System.ArgumentOutOfRangeException">The <paramref name="continuationOptions" /> argument specifies an invalid value.</exception>

<exception cref="T:System.ArgumentException">The <paramref name="tasks" /> array is empty or contains a null value.</exception>

<related type="Article" href="/dotnet/standard/parallel-programming/task-parallel-library-tpl">Task Parallel Library (TPL)</related>

<related type="Article" href="/dotnet/standard/parallel-programming/chaining-tasks-by-using-continuation-tasks">Chaining Tasks by Using Continuation Tasks</related>

</Docs>

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<Member MemberName="ContinueWhenAll">

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<MemberSignature Language="DocId" Value="M:System.Threading.Tasks.TaskFactory.ContinueWhenAll(System.Threading.Tasks.Task[],System.Action{System.Threading.Tasks.Task[]},System.Threading.CancellationToken,System.Threading.Tasks.TaskContinuationOptions,System.Threading.Tasks.TaskScheduler)" />

<MemberSignature Language="VB.NET" Value="Public Function ContinueWhenAll (tasks As Task(), continuationAction As Action(Of Task()), cancellationToken As CancellationToken, continuationOptions As TaskContinuationOptions, scheduler As TaskScheduler) As Task" />

<MemberSignature Language="F#" Value="member this.ContinueWhenAll : System.Threading.Tasks.Task[] * Action&lt;System.Threading.Tasks.Task[]&gt; * System.Threading.CancellationToken * System.Threading.Tasks.TaskContinuationOptions * System.Threading.Tasks.TaskScheduler -&gt; System.Threading.Tasks.Task" Usage="taskFactory.ContinueWhenAll (tasks, continuationAction, cancellationToken, continuationOptions, scheduler)" />

<MemberSignature Language="C++ CLI" Value="public:&#xA; System::Threading::Tasks::Task ^ ContinueWhenAll(cli::array &lt;System::Threading::Tasks::Task ^&gt; ^ tasks, Action&lt;cli::array &lt;System::Threading::Tasks::Task ^&gt; ^&gt; ^ continuationAction, System::Threading::CancellationToken cancellationToken, System::Threading::Tasks::TaskContinuationOptions continuationOptions, System::Threading::Tasks::TaskScheduler ^ scheduler);" />

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<AssemblyVersion>4.0.0.0</AssemblyVersion>

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<AssemblyVersion>4.2.0.0</AssemblyVersion>

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<ReturnValue>

<ReturnType>System.Threading.Tasks.Task</ReturnType>

</ReturnValue>

<Parameters>

<Parameter Name="tasks" Type="System.Threading.Tasks.Task[]" />

<Parameter Name="continuationAction" Type="System.Action&lt;System.Threading.Tasks.Task[]&gt;" />

<Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" />

<Parameter Name="continuationOptions" Type="System.Threading.Tasks.TaskContinuationOptions" />

<Parameter Name="scheduler" Type="System.Threading.Tasks.TaskScheduler" />

</Parameters>

<Docs>

<param name="tasks">The array of tasks from which to continue.</param>

<param name="continuationAction">The action delegate to execute when all tasks in the <paramref name="tasks" /> array have completed.</param>

<param name="cancellationToken">The cancellation token to assign to the new continuation task.</param>

<param name="continuationOptions">A bitwise combination of the enumeration values that control the behavior of the new continuation task.</param>

<param name="scheduler">The object that is used to schedule the new continuation task.</param>

<summary>Creates a continuation task that starts when a set of specified tasks has completed.</summary>

<returns>The new continuation task.</returns>

<remarks>

<format type="text/markdown"><![CDATA[

## Remarks

The NotOn\* and OnlyOn\* <xref:System.Threading.Tasks.TaskContinuationOptions>, which constrain for which <xref:System.Threading.Tasks.TaskStatus> states a continuation will be executed, are illegal with `ContinueWhenAll`.

]]></format>

</remarks>

<exception cref="T:System.ArgumentNullException">The <paramref name="tasks" /> array is <see langword="null" />.

-or-

The <paramref name="continuationAction" /> argument is <see langword="null" />.

-or-

The <paramref name="scheduler" /> argument is <see langword="null" />.</exception>

<exception cref="T:System.ArgumentException">The <paramref name="tasks" /> array is empty or contains a null value.</exception>

<related type="Article" href="/dotnet/standard/parallel-programming/task-parallel-library-tpl">Task Parallel Library (TPL)</related>

<related type="Article" href="/dotnet/standard/parallel-programming/chaining-tasks-by-using-continuation-tasks">Chaining Tasks by Using Continuation Tasks</related>

<exception cref="T:System.ArgumentOutOfRangeException">

<paramref name="continuationOptions" /> specifies an invalid <see cref="T:System.Threading.Tasks.TaskContinuationOptions" /> value.</exception>

<exception cref="T:System.ObjectDisposedException">The provided <see cref="T:System.Threading.CancellationToken" /> has already been disposed.</exception>

</Docs>

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<MemberSignature Language="C#" Value="public System.Threading.Tasks.Task ContinueWhenAll&lt;TAntecedentResult&gt; (System.Threading.Tasks.Task&lt;TAntecedentResult&gt;[] tasks, Action&lt;System.Threading.Tasks.Task&lt;TAntecedentResult&gt;[]&gt; continuationAction);" />

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<MemberSignature Language="DocId" Value="M:System.Threading.Tasks.TaskFactory.ContinueWhenAll``1(System.Threading.Tasks.Task{``0}[],System.Action{System.Threading.Tasks.Task{``0}[]})" />

<MemberSignature Language="VB.NET" Value="Public Function ContinueWhenAll(Of TAntecedentResult) (tasks As Task(Of TAntecedentResult)(), continuationAction As Action(Of Task(Of TAntecedentResult)())) As Task" />

<MemberSignature Language="F#" Value="member this.ContinueWhenAll : System.Threading.Tasks.Task&lt;'AntecedentResult&gt;[] * Action&lt;System.Threading.Tasks.Task&lt;'AntecedentResult&gt;[]&gt; -&gt; System.Threading.Tasks.Task" Usage="taskFactory.ContinueWhenAll (tasks, continuationAction)" />

<MemberSignature Language="C++ CLI" Value="public:&#xA;generic &lt;typename TAntecedentResult&gt;&#xA; System::Threading::Tasks::Task ^ ContinueWhenAll(cli::array &lt;System::Threading::Tasks::Task&lt;TAntecedentResult&gt; ^&gt; ^ tasks, Action&lt;cli::array &lt;System::Threading::Tasks::Task&lt;TAntecedentResult&gt; ^&gt; ^&gt; ^ continuationAction);" />

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<ReturnValue>

<ReturnType>System.Threading.Tasks.Task</ReturnType>

</ReturnValue>

<TypeParameters>

<TypeParameter Name="TAntecedentResult">

<Attributes>

<Attribute FrameworkAlternate="net-10.0;net-11.0;net-8.0;net-9.0">

<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>

<AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>

</Attribute>

</Attributes>

</TypeParameter>

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<Parameters>

<Parameter Name="tasks" Type="System.Threading.Tasks.Task&lt;TAntecedentResult&gt;[]" />

<Parameter Name="continuationAction" Type="System.Action&lt;System.Threading.Tasks.Task&lt;TAntecedentResult&gt;[]&gt;" />

</Parameters>

<Docs>

<typeparam name="TAntecedentResult">The type of the result of the antecedent <paramref name="tasks" />.</typeparam>

<param name="tasks">The array of tasks from which to continue.</param>

<param name="continuationAction">The action delegate to execute when all tasks in the <paramref name="tasks" /> array have completed.</param>

<summary>Creates a continuation task that starts when a set of specified tasks has completed.</summary>

<returns>The new continuation task.</returns>

<remarks>To be added.</remarks>

<exception cref="T:System.ObjectDisposedException">An element in the <paramref name="tasks" /> array has been disposed.</exception>

<exception cref="T:System.ArgumentNullException">The <paramref name="tasks" /> array is <see langword="null" />.

-or-

The <paramref name="continuationAction" /> argument is <see langword="null" />.</exception>

<exception cref="T:System.ArgumentException">The <paramref name="tasks" /> array is empty or contains a null value.</exception>

<related type="Article" href="/dotnet/standard/parallel-programming/task-parallel-library-tpl">Task Parallel Library (TPL)</related>

<related type="Article" href="/dotnet/standard/parallel-programming/chaining-tasks-by-using-continuation-tasks">Chaining Tasks by Using Continuation Tasks</related>

<related type="Article" href="/dotnet/standard/parallel-programming/task-cancellation">Task Cancellation</related>

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<Member MemberName="ContinueWhenAll&lt;TAntecedentResult&gt;">

<MemberSignature Language="C#" Value="public System.Threading.Tasks.Task ContinueWhenAll&lt;TAntecedentResult&gt; (System.Threading.Tasks.Task&lt;TAntecedentResult&gt;[] tasks, Action&lt;System.Threading.Tasks.Task&lt;TAntecedentResult&gt;[]&gt; continuationAction, System.Threading.CancellationToken cancellationToken);" />

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<MemberSignature Language="DocId" Value="M:System.Threading.Tasks.TaskFactory.ContinueWhenAll``1(System.Threading.Tasks.Task{``0}[],System.Action{System.Threading.Tasks.Task{``0}[]},System.Threading.CancellationToken)" />

<MemberSignature Language="VB.NET" Value="Public Function ContinueWhenAll(Of TAntecedentResult) (tasks As Task(Of TAntecedentResult)(), continuationAction As Action(Of Task(Of TAntecedentResult)()), cancellationToken As CancellationToken) As Task" />

<MemberSignature Language="F#" Value="member this.ContinueWhenAll : System.Threading.Tasks.Task&lt;'AntecedentResult&gt;[] * Action&lt;System.Threading.Tasks.Task&lt;'AntecedentResult&gt;[]&gt; * System.Threading.CancellationToken -&gt; System.Threading.Tasks.Task" Usage="taskFactory.ContinueWhenAll (tasks, continuationAction, cancellationToken)" />

<MemberSignature Language="C++ CLI" Value="public:&#xA;generic &lt;typename TAntecedentResult&gt;&#xA; System::Threading::Tasks::Task ^ ContinueWhenAll(cli::array &lt;System::Threading::Tasks::Task&lt;TAntecedentResult&gt; ^&gt; ^ tasks, Action&lt;cli::array &lt;System::Threading::Tasks::Task&lt;TAntecedentResult&gt; ^&gt; ^&gt; ^ continuationAction, System::Threading::CancellationToken cancellationToken);" />

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<AssemblyVersion>2.0.0.0</AssemblyVersion>

<AssemblyVersion>2.1.0.0</AssemblyVersion>

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<AssemblyVersion>4.2.0.0</AssemblyVersion>

<AssemblyVersion>4.2.1.0</AssemblyVersion>

<AssemblyVersion>4.2.2.0</AssemblyVersion>

<AssemblyVersion>5.0.0.0</AssemblyVersion>

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<AssemblyVersion>7.0.0.0</AssemblyVersion>

<AssemblyVersion>8.0.0.0</AssemblyVersion>

<AssemblyVersion>9.0.0.0</AssemblyVersion>

<AssemblyVersion>10.0.0.0</AssemblyVersion>

<AssemblyVersion>11.0.0.0</AssemblyVersion>

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<ReturnValue>

<ReturnType>System.Threading.Tasks.Task</ReturnType>

</ReturnValue>

<TypeParameters>

<TypeParameter Name="TAntecedentResult">

<Attributes>

<Attribute FrameworkAlternate="net-10.0;net-11.0;net-8.0;net-9.0">

<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>

<AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>

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<Parameters>

<Parameter Name="tasks" Type="System.Threading.Tasks.Task&lt;TAntecedentResult&gt;[]" />

<Parameter Name="continuationAction" Type="System.Action&lt;System.Threading.Tasks.Task&lt;TAntecedentResult&gt;[]&gt;" />

<Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" />

</Parameters>

<Docs>

<typeparam name="TAntecedentResult">The type of the result of the antecedent <paramref name="tasks" />.</typeparam>

<param name="tasks">The array of tasks from which to continue.</param>

<param name="continuationAction">The action delegate to execute when all tasks in the <paramref name="tasks" /> array have completed.</param>

<param name="cancellationToken">The cancellation token to assign to the new continuation task.</param>

<summary>Creates a continuation task that starts when a set of specified tasks has completed.</summary>

<returns>The new continuation task.</returns>

<remarks>To be added.</remarks>

<exception cref="T:System.ObjectDisposedException">An element in the <paramref name="tasks" /> array has been disposed.

-or-

The <see cref="T:System.Threading.CancellationTokenSource" /> that created <paramref name="cancellationToken" /> has already been disposed.</exception>

<exception cref="T:System.ArgumentNullException">The <paramref name="tasks" /> array is <see langword="null" />.

-or-

The <paramref name="continuationAction" /> argument is <see langword="null" />.</exception>

<exception cref="T:System.ArgumentException">The <paramref name="tasks" /> array is empty or contains a null value.</exception>

<related type="Article" href="/dotnet/standard/parallel-programming/task-parallel-library-tpl">Task Parallel Library (TPL)</related>

<related type="Article" href="/dotnet/standard/parallel-programming/chaining-tasks-by-using-continuation-tasks">Chaining Tasks by Using Continuation Tasks</related>

<related type="Article" href="/dotnet/standard/parallel-programming/task-cancellation">Task Cancellation</related>

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<Member MemberName="ContinueWhenAll&lt;TAntecedentResult&gt;">

<MemberSignature Language="C#" Value="public System.Threading.Tasks.Task ContinueWhenAll&lt;TAntecedentResult&gt; (System.Threading.Tasks.Task&lt;TAntecedentResult&gt;[] tasks, Action&lt;System.Threading.Tasks.Task&lt;TAntecedentResult&gt;[]&gt; continuationAction, System.Threading.Tasks.TaskContinuationOptions continuationOptions);" />

<MemberSignature Language="ILAsm" Value=".method public hidebysig instance class System.Threading.Tasks.Task ContinueWhenAll&lt;TAntecedentResult&gt;(class System.Threading.Tasks.Task`1&lt;!!TAntecedentResult&gt;[] tasks, class System.Action`1&lt;class System.Threading.Tasks.Task`1&lt;!!TAntecedentResult&gt;[]&gt; continuationAction, valuetype System.Threading.Tasks.TaskContinuationOptions continuationOptions) cil managed" />

<MemberSignature Language="DocId" Value="M:System.Threading.Tasks.TaskFactory.ContinueWhenAll``1(System.Threading.Tasks.Task{``0}[],System.Action{System.Threading.Tasks.Task{``0}[]},System.Threading.Tasks.TaskContinuationOptions)" />

<MemberSignature Language="VB.NET" Value="Public Function ContinueWhenAll(Of TAntecedentResult) (tasks As Task(Of TAntecedentResult)(), continuationAction As Action(Of Task(Of TAntecedentResult)()), continuationOptions As TaskContinuationOptions) As Task" />

<MemberSignature Language="F#" Value="member this.ContinueWhenAll : System.Threading.Tasks.Task&lt;'AntecedentResult&gt;[] * Action&lt;System.Threading.Tasks.Task&lt;'AntecedentResult&gt;[]&gt; * System.Threading.Tasks.TaskContinuationOptions -&gt; System.Threading.Tasks.Task" Usage="taskFactory.ContinueWhenAll (tasks, continuationAction, continuationOptions)" />

<MemberSignature Language="C++ CLI" Value="public:&#xA;generic &lt;typename TAntecedentResult&gt;&#xA; System::Threading::Tasks::Task ^ ContinueWhenAll(cli::array &lt;System::Threading::Tasks::Task&lt;TAntecedentResult&gt; ^&gt; ^ tasks, Action&lt;cli::array &lt;System::Threading::Tasks::Task&lt;TAntecedentResult&gt; ^&gt; ^&gt; ^ continuationAction, System::Threading::Tasks::TaskContinuationOptions continuationOptions);" />

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