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SemaphoreSlim.Release Method

Releases the SemaphoreSlim object once.

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

public int Release()

Return Value

Type: System.Int32
The previous count of the SemaphoreSlim.


The current instance has already been disposed.


The SemaphoreSlim has already reached its maximum size.

A call to the Release() method increments the CurrentCount property by one. If the value of the CurrentCount property is zero before this method is called, the method also allows one thread or task blocked by a call to the Wait or WaitAsync method to enter the semaphore.

.NET Framework

Supported in: 4.6, 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

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: 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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