Task<'TResult>.ContinueWith<'TNewResult> Method (Func<Task<'TResult>, Object, 'TNewResult>, Object)

.NET Framework (current version)
 

Creates a continuation that executes when the target Task<'TResult> completes.

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

member ContinueWith<'TNewResult> : 
        continuationFunction:Func<Task<'TResult>, Object, 'TNewResult> *
        state:Object -> Task<'TNewResult>

Parameters

continuationFunction
Type: System.Func<Task<'TResult>, Object, 'TNewResult>

A function to run when the Task<'TResult> completes. When run, the delegate will be passed the completed task and the caller-supplied state object as arguments.

state
Type: System.Object

An object representing data to be used by the continuation function.

Return Value

Type: System.Threading.Tasks.Task<'TNewResult>

A new continuation Task<'TResult>.

Type Parameters

TNewResult

The type of the result produced by the continuation.

Exception Condition
ArgumentNullException

The continuationFunction argument is null.

The returned Task<'TResult> will not be scheduled for execution until the current task has completed, whether it completes due to running to completion successfully, faulting due to an unhandled exception, or exiting out early due to being canceled.

The following example creates a chain of continuation tasks. Each task provides the current time, a DateTime object, for the state argument of the ContinueWith(Action<Task, Object>, Object) method. Each DateTime value represents the time at which the continue task is created. Each task produces as its result a second DateTime value that represents the time at which the task finishes. After all tasks finish, the example displays the date and times at which each continuation task starts and finishes.

No code example is currently available or this language may not be supported.

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.5
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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