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Task.WhenAny<TResult> Method (IEnumerable<Task<TResult>>)

.NET Framework 4.5

Creates a task that will complete when any of the supplied tasks have completed.

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

public static Task<Task<TResult>> WhenAny<TResult>(
	IEnumerable<Task<TResult>> tasks
)

Type Parameters

TResult: The type of the completed task.

Parameters

tasks: Type: System.Collections.Generic.IEnumerable<Task<TResult>>
The tasks to wait on for completion.

Return Value

Type: System.Threading.Tasks.Task<Task<TResult>>
A task that represents the completion of one of the supplied tasks. The return task's Result is the task that completed.

Exceptions

Exception	Condition
ArgumentNullException	The tasks argument was null.
ArgumentException	The tasks array contained a null task, or was empty.

Remarks

The returned task will complete when any of the supplied tasks has completed. The returned task will always end in the RanToCompletion state with its Result set to the first task to complete. This is true even if the first task to complete ended in the Canceled or Faulted state.

Version Information

.NET Framework

Supported in: 4.5

.NET for Windows Store apps

Supported in: Windows 8

Platforms

Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference

Task Class

WhenAny Overload

System.Threading.Tasks Namespace

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