• Article

Task.WaitAny Method (array<Task[])

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

Waits for any of the provided Task objects to complete execution.

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

Syntax

'Declaration
Public Shared Function WaitAny ( _
    ParamArray tasks As Task() _
) As Integer

public static int WaitAny(
    params Task[] tasks
)

Parameters

Return Value

Type: System.Int32
The index of the completed task in the tasks array argument.

Exceptions

Exception Condition
ObjectDisposedException

The Task has been disposed.
ArgumentNullException

The tasks argument is null.
ArgumentException

The tasks argument contains a null element.

Examples

The following example demonstrates using WaitAny to wait for any task in a set of tasks to complete.

// C#

var t1 = Task.Factory.StartNew(() => DoOperation1());

var t2 = Task.Factory.StartNew(() => DoOperation2());

Task.WaitAny(t1, t2)

' Visual Basic

Dim t1 = Task.Factory.StartNew(Sub()

DoOperation1()

End Sub)

Dim t2 = Task.Factory.StartNew(Sub()

DoOperation2()

End Sub)

Task.WaitAny(t1, t2)

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.