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Task.WhenAll Method (Task[])

.NET Framework 4.6 and 4.5

Creates a task that will complete when all of the Task objects in an array have completed.

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

public static Task WhenAll(
	params Task[] tasks
)

Parameters

tasks
Type: System.Threading.Tasks.Task[]

The tasks to wait on for completion.

Return Value

Type: System.Threading.Tasks.Task
A task that represents the completion of all of the supplied tasks.

ExceptionCondition
ArgumentNullException

The tasks argument was null.

ArgumentException

The tasks array contained a null task.

If any of the supplied tasks completes in a faulted state, the returned task will also complete in a Faulted state, where its exceptions will contain the aggregation of the set of unwrapped exceptions from each of the supplied tasks.

If none of the supplied tasks faulted but at least one of them was canceled, the returned task will end in the Canceled state.

If none of the tasks faulted and none of the tasks were canceled, the resulting task will end in the RanToCompletion state.

If the supplied array/enumerable contains no tasks, the returned task will immediately transition to a RanToCompletion state before it's returned to the caller.

.NET Framework

Supported in: 4.6, 4.5

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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