public static Task<TResult> Then<TSource, TResult>(
	this Task<TSource> task,
	Func<Task<TSource>, Task<TResult>> continuationFunction
)

<ExtensionAttribute>
Public Shared Function Then(Of TSource, TResult) ( 
	task As Task(Of TSource),
	continuationFunction As Func(Of Task(Of TSource), Task(Of TResult))
) As Task(Of TResult)

public:
[ExtensionAttribute]
generic<typename TSource, typename TResult>
static Task<TResult>^ Then(
	Task<TSource>^ task, 
	Func<Task<TSource>^, Task<TResult>^>^ continuationFunction
)

[<ExtensionAttribute>]
static member Then : 
        task : Task<'TSource> * 
        continuationFunction : Func<Task<'TSource>, Task<'TResult>> -> Task<'TResult> 

Parameters

task

Type: System.Threading.TasksTaskTSource
The antecedent task.

continuationFunction

Type: SystemFuncTaskTSource, TaskTResult
The continuation function to execute when task completes successfully. The continuation function returns a TaskTResult which provides the final result of the continuation.

Type Parameters

TSource

The type of the result produced by the antecedent TaskTResult.

TResult

The type of the result produced by the continuation TaskTResult.

Return Value

Usage Note

This code implements support for the following construct without requiring the use of /.

TSource source = await task.ConfigureAwait(false);
return await continuationFunction(task).ConfigureAwait(false);

If the antecedent task is canceled or faulted, the status of the antecedent is directly applied to the task returned by this method; it is not wrapped in an additional AggregateException.

Notes to Callers
Since the continuationFunction is executed synchronously, this method should only be used for lightweight continuation functions. This restriction applies only to continuationFunction itself, not to the Task returned by it.

.NET for Windows Store apps

.NET Framework

Portable Class Library

Threading Library

Reference