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Barrier.AddParticipants Method

Notifies the Barrier that there will be additional participants.

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

public long AddParticipants(
	int participantCount


Type: System.Int32

The number of additional participants to add to the barrier.

Return Value

Type: System.Int64
The phase number of the barrier in which the new participants will first participate.


The current instance has already been disposed.


participantCount is less than 0.


Adding participantCount participants would cause the barrier's participant count to exceed 32,767.


The method was invoked from within a post-phase action.

If the barrier is currently executing a post phase action, this call is blocked until the post phase action completes and the barrier has moved on to the next phase.

.NET Framework

Supported in: 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, 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.

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