Artikel
11/18/2011

Task.ContinueWith<TResult> Method (Func<Task, TResult>, CancellationToken, TaskContinuationOptions, TaskScheduler)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Creates a continuation that executes according to the condition specified in continuationOptions.

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

Syntax

'Declaration
Public Function ContinueWith(Of TResult) ( _
    continuationFunction As Func(Of Task, TResult), _
    cancellationToken As CancellationToken, _
    continuationOptions As TaskContinuationOptions, _
    scheduler As TaskScheduler _
) As Task(Of TResult)

public Task<TResult> ContinueWith<TResult>(
    Func<Task, TResult> continuationFunction,
    CancellationToken cancellationToken,
    TaskContinuationOptions continuationOptions,
    TaskScheduler scheduler
)

Type Parameters

TResult
The type of the result produced by the continuation.

Parameters

continuationFunction
Type: System.Func<Task, TResult>
A function to run according to the specified continuationOptions. When run, the delegate will be passed the completed task as an argument.

cancellationToken
Type: System.Threading.CancellationToken
The CancellationToken() that will be assigned to the new continuation task.

continuationOptions
Type: System.Threading.Tasks.TaskContinuationOptions
Options for when the continuation is scheduled and how it behaves. This includes criteria, such as OnlyOnCanceled, as well as execution options, such as ExecuteSynchronously.

scheduler
Type: System.Threading.Tasks.TaskScheduler
The TaskScheduler to associate with the continuation task and to use for its execution.

Return Value

Type: System.Threading.Tasks.Task<TResult>
A new continuation Task<TResult>.

Exceptions

Exception	Condition
ObjectDisposedException	The Task has been disposed. -or- The CancellationTokenSource that created the token has already been disposed.
ArgumentNullException	The continuationFunction argument is null. -or- The scheduler argument is null.
ArgumentOutOfRangeException	The continuationOptions argument specifies an invalid value for TaskContinuationOptions.

ObjectDisposedException

The Task has been disposed.

-or-

The CancellationTokenSource that created the token has already been disposed.

ArgumentNullException

The continuationFunction argument is null.

-or-

The scheduler argument is null.

ArgumentOutOfRangeException

The continuationOptions argument specifies an invalid value for TaskContinuationOptions.

Remarks

The returned Task<TResult> will not be scheduled for execution until the current task has completed. If the criteria specified through the continuationOptions parameter are not met, the continuation task will be canceled instead of scheduled.

Examples

The following example shows how to use the ContinueWith method with continuation options:

Version Information

Silverlight

Supported in: 5

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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